Tootfinder

GollumFit - An #IceCube Open-Source Framework for Binned-Likelihood Neutrino Telescope Analyses: https://arxiv.org/abs/2506.04491 -> An open-source software for neutrino telescope analyses: https://icecube.wisc.edu/news/research/2025/07/gollumfit-an-open-source-software-for-neutrino-telescope-analyses/

Für 400 Millionen Euro: Spanien will Thirty Meter Telescope nach La Palma holen
Weil die US-Regierung kein Geld geben will, steht das Thirty Meter Telescope auf Hawaii vor dem Aus. Spanien wirbt nun für einen Umzug nach La Palma – mit Geld.

The Atacama Cosmology Telescope: DR6 Sunyaev-Zel'dovich Selected Galaxy Clusters Catalog
HSC Collaboration, M. Aguena, S. Aiola, S. Allam, F. Andrade-Oliveira, D. Bacon, N. Bahcall, N. Battaglia, E. S. Battistelli, S. Bocquet, B. Bolliet, J. R. Bond, D. Brooks, E. Calabrese, J. Carretero, S. K. Choi, L. N. da Costa, M. Costanzi, W. Coulton, T. M. Davis, S. Desai, M. J. Devlin, S. Dicker, P. Doel, A. J. Duivenvoorden, J. Dunkley, S. Ferraro, B. Flaugher, J. Frieman, P. A. Gallardo, …

The Atacama Cosmology Telescope: DR6 Sunyaev-Zel'dovich Selected Galaxy Clusters Catalog
We present the results of a search for galaxy clusters in the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) microwave sky maps covering 16293 square degrees in three frequency bands, using data obtained over the lifetime of the project (2008-2022). We report redshifts and mass estimates for 9977 clusters detected via their Sunyaev-Zel'dovich (SZ) effect with signal-to-noise greater than 4 at a 2.4 arcminute filter scale. The catalog includes 1166 clusters at redshifts greater than 1, a…

Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars
J. Blunier, A. Neronov, D. Semikoz
https://arxiv.org/abs/2506.22285

Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars
Joint observations of extreme blazars with Fermi Large Area Telescope (LAT) and Imaging Atmospheric Cherenkov telescopes (IACT) have been previously used to derive lower bounds on intergalactic magnetic field (IGMF). We update these previous bounds using a set of extreme blazars that are detected in the Very-High-Energy (VHE, photon energies above 100 GeV) band by both Fermi/LAT and IACTs. We measure IGMF-dependent suppression of secondary delayed gamma-ray flux from electron-positron pairs dep…

The Sunspot Solar Observatory Data Archive: Continuing Operations at the Dunn Solar Telescope
Sean G. Sellers, Juie Shetye, Damian J. Christian, David B. Jess, Peter H. Keys, Gordon A. MacDonald, R. T. James McAteer, Jason Jackiewicz, Colin Hancock, Michael S. Thompson, Jamey E. Eriksen, Sara Jeffreys
https://arxiv.org/abs/2505.…

The Sunspot Solar Observatory Data Archive: Continuing Operations at the Dunn Solar Telescope
The Sunspot Solar Observatory Data Archive (SSODA) stores data acquired with the suite of instruments at the Richard B. Dunn Solar Telescope (DST) from February 2018 to the present. The instrumentation at the DST continues to provide high cadence imaging, spectroscopy, and polarimetry of the solar photosphere and chromosphere across a wavelength range from 3500Å to 11,000Å. At time of writing, the archive contains approximately 374 TiB of data across more than 520 observing days (starting on …

An H$\alpha$ Cloud in the HI Tail: Recent Star Formation in the Outskirts of NGC 4258 Revealed by Nanshan 1-m Telescope
Cheng Cheng, Jia-Sheng Huang, Peng Wei, Ali Esamdin, Guojie Feng, Zhi-Xiang Zhang, Haojing Yan, Wei Du, Pei Zuo, Zi-Jian Li, Gustavo Orellana, Letian Wang, Yong Wang, Abdusamatjan Iskandar, Shahidin Yaqup
https://

An H$α$ Cloud in the HI Tail: Recent Star Formation in the Outskirts of NGC 4258 Revealed by Nanshan 1-m Telescope
We present first-light deep H$α$ imaging taken with the Nanshan 1-meter wide-field telescope on the local galaxy NGC 4258, alongside archival data from Hubble Space telescope (HST), Westerbork Synthesis Radio Telescope, and The Dark Energy Camera Legacy Survey. The H$α$ image shows ongoing star formation not only inside the galaxy but also in an HI cloud in the eastern HI tail, which is roughly 16 kpc away from the main galaxy. The HST images reveal several ultra-blue compact objects ($\rm F5…

Cruising through outer space it’s so pretty.
Vera Rubin telescope Skyviewer: https://skyviewer.app/explorer

Inside the Vera C. Rubin Observatory, whose 3.2-gigapixel camera will produce 60PB of space image data over 10 years, to be analyzed using ML and deep learning (New York Times)
https://www.nytimes.com/2025/06/20/science…

How Vera Rubin Telescope Scientists Will Deal With 60 Million Billion Bytes of Imagery
The Vera C. Rubin Observatory will make the study of stars and galaxies more like the big data-sorting exercises of contemporary genetics and particle physics.

Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory
Katie E. Painter, Brendan P. Bowler, Kyle Franson, Juliette C. Becker, Jennifer A. Burt
https://arxiv.org/abs/2506.21768

Astrometric Accelerations of Provisional Targets for the Habitable Worlds Observatory
NASA's Habitable Worlds Observatory (HWO) will be the first space telescope capable of directly imaging Earth-like planets in the habitable zones of Sun-like stars to probe their atmospheres for signs of life. Now in its early stages of design, a list of the 164 most promising targets for HWO has been released to the community to carry out precursor science. Massive companions in these systems--stars, brown dwarfs, or giant planets--could preclude the existence of Earth-sized planets in the hab…

Webb telescope captures first direct image of a new exoplanet in debris disk
https://phys.org/news/2025-06-webb-telescope-captures-image-exoplanet.html

Evaluation of gamma-ray response of the AstroPix4 HV-CMOS active pixel sensor
Yusuke Suda, Regina Caputo, Daniel Violette, Grant Sommer, Nicolas Striebig, Manoj Jadhav, Yasushi Fukazawa, Carolyn Kierans, Richard Leys, Jessica Metcalfe, Norito Nakano, Ivan Peri\'c, Jeremy S. Perkins, Hiroyasu Tajima
https://arxiv.org/abs/2507.21618

Evaluation of gamma-ray response of the AstroPix4 HV-CMOS active pixel sensor
AstroPix is a novel high-voltage CMOS active pixel sensor being developed for a next generation gamma-ray space telescope, AMEGO-X. To meet AMEGO-X instrument requirements, AstroPix must achieve full depletion of its $500~\rm{μm}$ thick, $500~\rm{μm}$-pitch pixels. It must be sensitive to gamma rays in the range of $25-700$ keV, with the energy resolution at 122 keV of $<10$%. Furthermore, given the space-based nature of AMEGO-X, the power consumption of AstroPix needs to be lower than $1.5~\…

Tux se protège du soleil et de la chaleur en attendant la nuit. #RAP2025 #StarParty #telescope #astronomie

NASA’s NICER (Neutron star Interior Composition Explorer), an X-ray telescope on the International Space Station, has paused observations due to a problem with one of the motors that drives its ability to track cosmic objects: #NICER team paused operations June 17 when performance degradation in the motor began affecting science observations. Engineers are investigating the cause and potential solutions.

First coordinated observations between Solar Orbiter and the Daniel K. Inouye Solar Telescope
Krzysztof Barczynski, Miho Janvier, Chris J. Nelson, T. Schad, A. Tritschler, Louise Harra, Daniel M\"uller, Susanna Parenti, Gherardo Valori, Gianna Cauzzi, Yingjie Zhu
https://arxiv.org/abs/2507.19198…

First coordinated observations between Solar Orbiter and the Daniel K. Inouye Solar Telescope
Solar Orbiter and the Daniel K. Inouye Solar Telescope (DKIST) are two of the newest facilities available to the solar physics community. The first coordinated observations of the Sun by these two facilities occurred over the course of one week in October 2022. The returned data are open-access and will provide a valuable resource to researchers in the field. We provide an overview of the datasets collected by Solar Orbiter and DKIST through this coordination and discuss their scientific pote…

#Spain Proposes Rerouting Research Around #USA And #Hawaii By Using #CanaryIslands For Location Of New

Spain bids €400 million to host mega telescope at risk in US budget cuts
New Canary Islands home could save controversial Thirty Meter Telescope first proposed for Hawaii.

Explaining the "too massive" high-redshift galaxies in JWST data: numerical study of three effects and a simple relation
Joshua J. Ziegler, Katherine Freese, Jonathan Lozano, Gabriele Montefalcone
https://arxiv.org/abs/2507.21409

Explaining the "too massive" high-redshift galaxies in JWST data: numerical study of three effects and a simple relation
The James Webb Space Telescope has discovered high luminosity galaxies that appear to be "too many" and "too massive" compared to predictions of the Standard LCDM cosmology, suggesting that star formation in the early universe is more rapid than previously anticipated. In this paper we examine in detail the following three effects which can instead provide alternative explanations for these observations: (1) a "top heavy" initial mass function (IMF) for the stars, (2) a variety of star formatio…

Quantifying Radio Source Morphology
Lachlan J. Barnes, Andrew M. Hopkins, Lawrence Rudnick, Heinz Andernach, Michael Cowley, Nikhel Gupta, Ray P. Norris, Stanislav S. Shabala, Tayyaba Zafar
https://arxiv.org/abs/2506.21906

Quantifying Radio Source Morphology
The advent of next-generation telescope facilities brings with it an unprecedented amount of data, and the demand for effective tools to process and classify this information has become increasingly important. This work proposes a novel approach to quantify the radio galaxy morphology, through the development of a series of algorithmic metrics that can quantitatively describe the structure of radio source, and can be applied to radio images in an automatic way. These metrics are intuitive in na…

Visited the old soviet radio telescope again and got a guided tour.
Fantastic tour guy even turned the 32 meter one around for us and we got to walk on the inside of a 16m dish.

Shepherding Miorita and its flock: A group of near-Earth asteroids driven by apsidal and von Zeipel-Lidov-Kozai secular resonances. A source of low-perihelion asteroids
R. de la Fuente Marcos, C. de la Fuente Marcos, O. V\u{a}duvescu
https://arxiv.org/abs/2507.21251

Shepherding Miorita and its flock: A group of near-Earth asteroids driven by apsidal and von Zeipel-Lidov-Kozai secular resonances. A source of low-perihelion asteroids
Context. Secular resonances can control the dynamical evolution of near-Earth asteroids (NEAs) and, in some cases, lead to increased orbital stability. Asteroid 622577 Miorita (2014 LU14 ) was the first NEA found by the Isaac Newton Telescope (INT) and exhibits unusual dynamical traits although it approaches Venus, Earth, and Mars at relatively close range. Aims. Here, we investigate the orbital context of Miorita and search for possible dynamical analogs within the NEA population. Methods.…

NIRPS joining HARPS at ESO 3.6 m. On-sky performance and science objectives
Francois Bouchy, Rene Doyon, Francesco Pepe, Claudio Melo, Etienne Artigau, Lison Malo, Francois Wildi, Frederique Baron, Xavier Delfosse, Jose Renan De Medeiros, Rafael Rebolo, Nuno C. Santos, Gregg Wade, Romain Allart, Khaled Al Moulla, Nicolas Blind, Charles Cadieux, Bruno L. Canto Martins, Neil J. Cook, Xavier Dumusque, Yolanda Frensch, Frederic Genest, Jonay I. Gonzalez Hernandez, Nolan Grieves, Gaspare Lo…

NIRPS joining HARPS at ESO 3.6 m. On-sky performance and science objectives
The Near-InfraRed Planet Searcher (NIRPS) is a high-resolution, high-stability near-infrared (NIR) spectrograph equipped with an AO system. Installed on the ESO 3.6-m telescope, it was developed to enable radial velocity (RV) measurements of low-mass exoplanets around M dwarfs and to characterise exoplanet atmospheres in the NIR. This paper provides a comprehensive design overview and characterisation of the NIRPS instrument, reporting on its on-sky performance, and presenting its GTO programme…

Le 915 mm attire du monde Š la tombée de la nuit.
#StarParty #RAP2025 #Astrodon #telescope

James Webb Space Telescope observations of the white dwarf cooling sequence of 47 Tucanae
M. Salaris (Liverpool John Moores University, INAF-OAAb), M. Scalco (INAF-OAPD), L. R. Bedin (INAF-OAPD), S. Cassisi (INAF-OAAb, INFN-Pisa)
https://arxiv.org/abs/2506.20732

James Webb Space Telescope observations of the white dwarf cooling sequence of 47 Tucanae
We present a study of the white dwarf (WD) cooling sequence of the globular cluster 47 Tucanae (47 Tuc or NGC 104) using deep infrared observations with the James Webb Space Telescope (JWST). By combining these data with ultra-deep optical imaging from the Hubble Space Telescope (HST) taken ~12 years earlier, we derived precise proper motions (PMs) and isolated a clean sample of WD cluster members. We estimated the cluster's age by comparing the observed WD cooling sequence luminosity function …

New modeling of the stray light noise in the main arms of the Einstein Telescope
M. Andr\'es-Carcasona, J. Grandes Umbert, D. Gonz\'alez-Lociga, M. Mart\'inez, Ll. M. Mir, H. Yamamoto
https://arxiv.org/abs/2506.18083

New modeling of the stray light noise in the main arms of the Einstein Telescope
Stray light represents a significant noise source for gravitational wave detectors, requiring an accurate modeling and mitigation to preserve the experiment's sensitivity. In this article, we present an updated and improved analysis of the stray-light induced noise in the Einstein Telescope main arm. The results presented here supersede previous studies taking into account a number of improvements, including baffle clipping effects, new numerical calculations for computing diffraction contribut…

Estimation of the capabilities of the SPHERE-3 Cherenkov telescope for determining the parameters of the primary cosmic particle
E. A. Bonvech, O. V. Cherkesova, D. V. Chernov, E. L. Entina, V. I. Galkin, V. A. Ivanov, T. A. Kolodkin, N. O. Ovcharenko, D. A. Podgrudkov, T. M. Roganova, M. D. Ziva
https://arxiv.org/abs/2507.17899

Estimation of the capabilities of the SPHERE-3 Cherenkov telescope for determining the parameters of the primary cosmic particle
New results of modeling the operation of the new SPHERE-3 Cherenkov telescope are presented. The telescope will be able to detect cosmic particles by direct and reflected Cherenkov light of the extensive air showers (EAS). Dual detection improves the accuracy of determining the parameters of the primary particle. The study is based on the data bank of distributions of the EAS Cherenkov light obtained on the Lomonosov-2 supercomputer. The accuracy of determining the energy and type of the primar…

https://www.theregister.com/2025/06/24/vera_galaxy_camera

World's largest camera shows galaxy in 3,200 megapixel glory as Rubin telescope goes online
: 20TB of galactic shots a day, backed by Microsofties

Replaced article(s) found for astro-ph.CO. https://arxiv.org/list/astro-ph.CO/new
[1/1]:
- The Atacama Cosmology Telescope: A census of bridges between galaxy clusters
G. Isopi, et al.

The Chemical Clock of High-mass Star-forming Regions: N2H /CCS
J. L. Chen, J. S. Zhang, J. X. Ge, Y. X. Wang, H. Z. Yu, Y. P. Zou, Y. T. Yan, X. Y. Wang, D. Y. Wei
https://arxiv.org/abs/2505.23221

The Chemical Clock of High-mass Star-forming Regions: N2H+/CCS
Using the IRAM 30 m telescope, we presented observations of N2H+ J = 1-0, CCS JN = 87-76 and 77-66 lines toward a large sample of ultracompact HII regions (UC HIIs). Among our 88 UC HIIs, 87 and 33 sources were detected in the N2H+ J = 1-0 and CCS JN = 87-76 lines, respectively. For the CCS 77-66 transition, we detected emission in 10 out of 82 targeted sources, all of which also exhibited emission in the CCS JN = 87-76 line. Physical parameters are derived for our detections, including the opt…

First images from powerful new telescope released | BBC News
https://www.youtube.com/watch?v=7MdDB941Tp0

A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44
Colin Orion Chandler, William J. Oldroyd, Chadwick A. Trujillo, Dmitrii E. Vavilov, William A. Burris
https://arxiv.org/abs/2507.21324

A Dormant Captured Oort Cloud Comet Awakens: (18916) 2000 OG44
We report the discovery of activity emanating from (18916) 2000 OG44 (alternately designated 1977 SD), a minor planet previously reported to be both an extinct comet or an asteroid on a cometary orbit. We observed 2000 OG44 with a thin tail oriented towards the coincident anti-solar and anti-motion vectors (as projected on the sky) in images we acquired on UT 2023 July 24 and 26 with the Apache Point Observatory 3.5-meter Astrophysical Research Consortium telescope (New Mexico, USA). We also in…

A search of periodic variable stars in the LMC by JWST photometry
Jiyu Wang, Xiaodian Chen, Jianxing Zhang, Ziming Yan, Shu Wang, Licai Deng
https://arxiv.org/abs/2506.21971

A search of periodic variable stars in the LMC by JWST photometry
Based on high-resolution near-infrared photometric data from the James Webb Space Telescope (JWST) targeting the Large Magellanic Cloud (LMC), this study attempts to evaluate the feasibility and sensitivity limits of variable star detection in crowded stellar fields. Through light curve analysis, we identified a total of 304 periodic variable stars, including 71 EW-type eclipsing binaries, 7 EA-type eclipsing binaries, 177 rotational variables, 38 $δ$ Scuti (DSCT) stars, and 12 RR Lyrae stars.…

Nighttime Cloud Detection, Tracking and Prediction with All-Sky Cameras
Sebastian Buntin, Chris M. Copperwheat, Helen E. Jermak
https://arxiv.org/abs/2507.21711 https://

Nighttime Cloud Detection, Tracking and Prediction with All-Sky Cameras
This paper presents a novel method for real-time nighttime cloud detection, tracking, and prediction using all-sky cameras, aimed at enhancing the efficiency of ground-based robotic telescopes. Ground-based telescopes are vulnerable to adverse weather conditions, particularly cloud cover, which can lead to the loss of valuable observation time and potential damage to the telescope. Existing methods for cloud detection have limitations in accuracy, particularly under varying illumination conditi…

4/4 📊 Visible failure tracking in #Horizon, #Telescope, or your #APM for better debugging and monitoring of failed jobs.

Neutrino Telescope Event Classification on Quantum Computers
Pablo Rodriguez-Grasa, Pavel Zhelnin, Carlos A. Arg\"uelles, Mikel Sanz
https://arxiv.org/abs/2506.16530

Neutrino Telescope Event Classification on Quantum Computers
Quantum computers represent a new computational paradigm with steadily improving hardware capabilities. In this article, we present the first study exploring how current quantum computers can be used to classify different neutrino event types observed in neutrino telescopes. We investigate two quantum machine learning approaches, Neural Projected Quantum Kernels (NPQKs) and Quantum Convolutional Neural Networks (QCNNs), and find that both achieve classification performance comparable to classic…

Join the NSF–DOE Vera C. Rubin Observatory team on June 23, 2025 at 11am US EDT
as they reveal the first incredible images from the world’s newest and most powerful survey telescope,
equipped with the largest digital camera ever built.
https://m.youtube.com/watch?v=Zv22_Ams

Velocity Reconstruction from KSZ: Measuring $f_{NL}$ with ACT and DESILS
Selim C. Hotinli, Kendrick M. Smith, Simone Ferraro
https://arxiv.org/abs/2506.21657

Velocity Reconstruction from KSZ: Measuring $f_{NL}$ with ACT and DESILS
The kinetic Sunyaev-Zel'dovich (kSZ) effect offers an indirect way to reconstruct large-scale cosmic velocities, by correlating high-resolution CMB temperature maps with galaxy surveys. In this work, we present the first three-dimensional reconstruction of the large-scale velocity field using a photometric galaxy survey, using data from the DESI Legacy Imaging Surveys (DESILS) and the Atacama Cosmology Telescope (ACT) DR5. We detect an $11.7σ$ correlation between our velocity reconstruction an…

The Cooling of Old White Dwarfs in 47 Tucanae
Leesa Fleury, Harvey Richer, Jeremy Heyl
https://arxiv.org/abs/2507.22046 https://arxiv.org/pdf/2507.22046

The Cooling of Old White Dwarfs in 47 Tucanae
We analysed the cooling of white dwarfs in the globular cluster 47 Tucanae using deep observations from the Hubble Space Telescope that resolve the white dwarf cooling sequence to late enough cooling times that the white dwarf core has begun to crystallise and the envelope has become convectively coupled to the core. At such late cooling times, both the state of matter assumed for ions in the treatment of element diffusion and the thickness of the outer H envelope become important consideration…

#ALMA 2D #SuperResolution imaging survey of Ophiuchus Class I/flat spectrum/II #disks - discovery of new disk substructures: https://academic.oup.com/pasj/article/77/3/572/8117664?login=false -> New Super-resolution Imaging Reveals the First Step of Planet Formation after Star Birth / New Insights into Planet Formation from Public Data with New Imaging Technique: https://alma-telescope.jp/en/news/press/cradle-202506.html / https://www.nao.ac.jp/en/news/science/2025/20250624-alma.html

JCMT POL-2 observations of magnetic fields potentially shaped by outflows in the pre-planetary nebulae CRL 618 and OH231.8 4.2
Kate Pattle, Giorgio Savini
https://arxiv.org/abs/2507.21829

JCMT POL-2 observations of magnetic fields potentially shaped by outflows in the pre-planetary nebulae CRL 618 and OH231.8+4.2
We present the first observations of magnetic fields in pre-planetary nebulae (PPNe) made with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We observed the PPNe CRL 618 and OH231.8+4.2 in 850 $μ$m polarized light. In both cases, we observe ordered magnetic fields that appear to arise from dusty circumstellar material that has been swept up by the passage of outflows driven by the central post-Asymptotic Giant Branch (post-AGB) star. CRL 618 shows a magnetic field aligned …

Transient MeV radiation from a relativistic tidal disruption candidate
Gor Oganesyan, Elias Kammoun, Annarita Ierardi, Alessio Ludovico De Santis, Biswajit Banerjee, Emanuele Sobacchi, Felix Aharonian, Samanta Macera, Pawan Tiwari, Alessio Mei, Shraddha Mohnani, Stefano Ascenzi, Samuele Ronchini, Marica Branchesi
https://arxiv.org/abs/2507…

Transient MeV radiation from a relativistic tidal disruption candidate
On July 2, 2025, the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-ray space telescope detected three short-duration MeV transients with overlapping sky locations. These events, named as GRB 250702D, B, and E (collectively referred to as DBE), triggered the detector with delays of approximately 1-2 hours between each burst. Follow-up observations of this unusually long MeV transient (lasting >3 hours) by the Neil Gehrels Swift Observatory and the Nuclear Spectroscopic Telescope Array ov…

Apache Point rapid response characterization of primitive pre-impact detection asteroid 2024 RW$_1$
Carl Ingebretsen, Bryce T. Bolin, Robert Jedicke, Peter Vere\v{s}, Christine H. Chen, Carey M. Lisse, Russet McMillan, Torrie Sutherland, Amanda J. Townsend
https://arxiv.org/abs/2505.23736

Apache Point rapid response characterization of primitive pre-impact detection asteroid 2024 RW$_1$
Pre-impact detection asteroids (PIDAs) may be detected only a few hours before their impact with Earth, providing a brief opportunity to characterize them before impact. We describe the characterization of PIDA 2024 RW$_1$, which was discovered by the Catalina Sky Survey on 2024 September 4 at 05:43 UTC, before it entered the atmosphere near the northern Philippines at 16:39 UTC. We observed 2024 RW$_1$ with the Astrophysical Research Consortium Telescope Imaging Camera on the Apache Point Astr…

GW170817 Viable Einstein-Gauss-Bonnet Inflation Compatible with the Atacama Cosmology Telescope Data
S. D. Odintsov, V. K. Oikonomou
https://arxiv.org/abs/2506.08193

GW170817 Viable Einstein-Gauss-Bonnet Inflation Compatible with the Atacama Cosmology Telescope Data
In this work we investigate several Einstein-Gauss-Bonnet models that are compatible with the GW170817 event, the Atacama Cosmology Telescope data and the BICEP/Keck updated Planck constraints on the tensor-to-scalar ratio. We consider two distinct classes of Einstein-Gauss-Bonnet theories, which are equally successful for GW170817-compatible model building and we examine their viability against the Atacama Cosmology Telescope data and the updated Planck constraints on the tensor-to-scalar rati…

disappointed by the weather

Hoping for a #flare: During the final days of our 2 week observation campaign with #GREGORSolarTelescope on Tenerife, scientists work remote from the “GREGOR Operations Center” at #MPSGoettingen

TIL #Telescope for #neovim has a planets picker

PyTICS: An Iterative Method for Photometric Lightcurve Intercalibration using Comparison Stars
Roberta Vieliute, Juan V. Hern\'andez Santisteban, Keith Horne
https://arxiv.org/abs/2505.23328

PyTICS: An Iterative Method for Photometric Lightcurve Intercalibration using Comparison Stars
Intensive reverberation mapping monitoring programs combine ground-based photometric observations from different telescopes, requiring intercalibration of lightcurves to reduce systematic instrumental differences. We present a new iterative algorithm to calibrate photometric time-series data of active galactic nuclei (AGN) using 100s of comparison stars on the same images, building upon the established method of ensemble photometry. The algorithm determines telescope-specific and epoch-specific…

A Comprehensive Multiwavelength Study of the OH Megamaser galaxy IRAS 09320 6134
Claudia M. Cassanta, Rogemar A. Riffel, Andrew Robinson, Preeti Kharb, Thaisa Storchi-Bergmann, Jack Gallimore, Dinalva A. Sales, C. Hekatelyne, Stefi Baum, Christopher O'Dea
https://arxiv.org/abs/2506.21838…

A Comprehensive Multiwavelength Study of the OH Megamaser galaxy IRAS 09320+6134
We present a multiwavelength study of the gas distribution, kinematics and excitation of the OH megamaser galaxy IRAS 09320+6134 (UGC 5101) using Gemini Multi-Object Spectrograph Integral Field Unit, Hubble Space Telescope, and Very Large Array observations. The HST ACS F814W i-band and H$α$ + [N II] $λλ$ 6548,84 narrow-band images indicate that this galaxy is a late-stage merger. The ionized gas emission in the inner $\sim$ 2 kpc radius, traced by the GMOS data, is consistent with two kinem…

The formation and evolution of dust in the colliding-wind binary Apep revealed by JWST: #binary Apep [...] reveal an intricate series of nested concentric dust shells that are abundant in detailed substructure. The striking regularity in these substructures between successive shells suggests an exactly repeating formation mechanism combined with a highly stable outflow that maintains a consistent morphology even after reaching 0.6 pc (assuming a distance of 2.4 kpc) into the interstellar medium." See also https://bsky.app/profile/landru79.bsky.social/post/3luqbnb2jmk25 for other processing experiments with the image, https://arxiv.org/abs/2507.14610 for another paper and https://theconversation.com/swirling-nebula-of-two-dying-stars-revealed-in-spectacular-detail-in-new-webb-telescope-image-258314 for an article!

Multi-scale optimal control for Einstein Telescope active seismic isolation
Pooya Saffarieh, Nathan A. Holland, Michele Valentini, Jesse van Dongen, Alexandra Mitchell, Sander Sijtsma, Armin Numic, Wouter Hakvoort, Conor Mow-Lowry
https://arxiv.org/abs/2507.15398

Multi-scale optimal control for Einstein Telescope active seismic isolation
We present a multi-scale optimal control framework for active seismic isolation in the Einstein Telescope, a third-generation gravitational-wave observatory. Our approach jointly optimizes feedback and blending filters in a cross-coupled opto-mechanical system using a unified cost function based on the "acausal optimum," which quantifies sensor signal-to-noise ratios across frequencies. This method enables efficient re-optimization under varying sensor configurations and environmental condition…

Magnetic field of a ring-like shape molecular cloud
Dana Alina, Adel Umirbayeva, Yasuo Doi, Soichiro Jo, Yue Hu, Alex Lazarian, Janik Karoly, Tie Liu, Koji S. Kawabata, Alua Mukhash, Danial Zhumagayir, Tomori Hori, Tetsuharu Maruta, Ryo Imazawa, Tatsuya Nakaoka, Mahito Sasada
https://arxiv.org/abs/2507.19281

Magnetic field of a ring-like shape molecular cloud
We present a detailed study of the magnetic field structure in the G111 molecular cloud, a ring-like filamentary cloud within the NGC 7538 region. We utilized interstellar dust polarization from the Planck telescope to trace large-scale field orientations, starlight extinction polarization from the Kanata telescope to probe the cloud's magnetic field after foreground subtraction, and velocity gradients derived from CO isotopologues, observed with the IRAP 30m telescope, to examine dense regions…

The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-Puff, Kepler-51d
Jessica E. Libby-Roberts, Aaron Bello-Arufe, Zachory K. Berta-Thompson, Caleb I. Ca\~nas, Yayaati Chachan, Renyu Hu, Yui Kawashima, Catriona Murray, Kazumasa Ohno, Armen Tokadjian, Suvrath Mahadevan, Kento Masuda, Leslie Hebb, Caroline Morley, Guangwei Fu, Peter Gao, Kevin B. Stevenson

The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-Puff, Kepler-51d
Kepler-51 is a 500 Myr G dwarf hosting three "super-puffs" and one low-mass non-transiting planet. Kepler-51d, the coolest (T_eq ~ 350 K) transiting planet in this system, is also one of the lowest density super-puffs known to date (rho_p = 0.038 +/- 0.009 g/cm^3). With a planetary mass of Mp = 5.6 +/- 1.2 Earth masses and a radius of Rp = 9.32 +/- 0.18 Earth radii, the observed properties of this planet are not readily explained by most planet formation theories. Hypotheses explaining Kepler-5…

James Webb Space Telescope Observations of the Nearby and Precisely-Localized FRB 20250316A: A Potential Near-IR Counterpart and Implications for the Progenitors of Fast Radio Bursts
Peter K. Blanchard, Edo Berger, Shion E. Andrew, Aswin Suresh, Kohki Uno, Charles D. Kilpatrick, Brian D. Metzger, Harsh Kumar, Navin Sridhar, Amanda M. Cook, Yuxin Dong, Tarraneh Eftekhari, Wen-fai Fong, Walter W. Golay, Daichi Hiramatsu, Ronniy C. Joseph, Victoria M. Kaspi, Mattias Lazda, Calvin Leung, K…

James Webb Space Telescope Observations of the Nearby and Precisely-Localized FRB 20250316A: A Potential Near-IR Counterpart and Implications for the Progenitors of Fast Radio Bursts
We present deep James Webb Space Telescope near-infrared imaging to search for a quiescent or transient counterpart to FRB 20250316A, which was precisely localized with the CHIME/FRB Outriggers array to an area of $11\times13$ pc in the outer regions of NGC 4141 at $d\approx40$ Mpc. Our F150W2 image reveals a faint source near the center of the FRB localization region ("NIR-1"; $M_{\rm F150W2}\approx-2.5$ mag; probability of chance coincidence $\approx0.36$), the only source within $\approx2.7�…

Télescope binoculaire de 600 mm 😍😍😍#StarParty #RAP2025 #Astrodon #astronomie

Das Ende des Thirty Meter Telescopes? – US-Kongress soll kein Geld mehr geben
2024 hat die National Science Foundation erklärt, dass das Geld nur für ein US-Riesenteleskop reicht. Nun soll das Thirty Meter Telescope leer ausgehen.

The Crab Nebula at subarcsecond resolution with the International LOFAR Telescope
M. Arias, R. Timmerman, F. Sweijen, R. J. van Weeren, C. G. Bassa
https://arxiv.org/abs/2506.19460

The Crab Nebula at subarcsecond resolution with the International LOFAR Telescope
We present International LOw Frequency ARray (LOFAR) Telescope (ILT) observations of the Crab Nebula, the remnant of a core-collapse supernova explosion observed by astronomers in 1054. The field of the Crab Nebula was observed between 120 and 168 MHz as part of the LOFAR Two Meter Sky Survey (LoTSS), and the data were re-processed to include the LOFAR international stations to create a high angular resolution ($0.43'' \times 0.28''$) map at a central frequency of 145 MHz. Combining the ILT map…

Detectability and Parameter Estimation for Einstein Telescope Configurations with GWJulia
Andrea Begnoni, Stefano Anselmi, Mauro Pieroni, Alessandro Renzi, Angelo Ricciardone
https://arxiv.org/abs/2506.21530

Detectability and Parameter Estimation for Einstein Telescope Configurations with GWJulia
Future gravitational-wave (GW) detectors are expected to detect tens of thousands of compact binary coalescences (CBC) per year, depending also on the final detectors layout. For this reason, it is essential to have a fast, reliable tool for forecasting how different detector layouts will affect parameter estimation for these events. The Fisher Information Matrix (FIM) is a common tool for tackling this problem. In this paper, we present a new open source code GWJulia to perform FIM analysis of…

Deuterated water abundance in the young hot core RCW 120 S2
Maria. S. Kirsanova, Anastasiia A. Farafontova
https://arxiv.org/abs/2505.21945 https://…

Deuterated water abundance in the young hot core RCW 120 S2
Since the emission of water molecules cannot be observed from Earth, less abundant isotopologues, such as H$_2^{18}$O and HDO, are used to trace water in star-forming regions. The main aim of this study is to determine HDO abundance in the hot core RCW 120 S2. We performed observations of the hot core in the 200-255~GHz range using the nFLASH230 receiver on the APEX telescope. Two HDO lines were detected toward RCW 120 S2. Their intensities are described by excitation temperature $286\pm2$~K an…

This https://arxiv.org/abs/2503.22361 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A novel approach of optimizing the image cleaning performance of Imaging Atmospheric Cherenkov Telescopes: Application to a time-based cleaning for H.E.S.S
This study introduces a time-based cleaning method for H.E.S.S. using CT5 in monoscopic mode and presents an optimization workflow for image-cleaning algorithms to enhance telescope sensitivity while minimizing systematic biases. We evaluate three methods - tail-cut cleaning and two flavours of time-based cleaning TIME3D and TIME4D - and find best-cut configurations for two cases: optimal overall sensitivity and minimal energy threshold. TIME3D achieves a $\sim 15\%$ improvement with regard to …

Impact of Low-Earth Orbit Satellites on the China Space Station Telescope Observations
Huai-Jin Tang, Xiao-Lei Meng, Hu Zhan, Xian-Min Meng, You-Hua Xu
https://arxiv.org/abs/2507.14994

Impact of Low-Earth Orbit Satellites on the China Space Station Telescope Observations
It is projected that more than 100,000 communication satellites will be deployed in Low-Earth Orbit (LEO) over the next decade. These LEO satellites (LEOsats) will be captured frequently by the survey camera onboard the China Space Station Telescope (CSST), contaminating sources in the images. As such, it is necessary to assess the impact of LEOsats on CSST survey observations. We use the images taken by the Hubble Space Telescope (HST) in its F814W band to simulate $i$-band images for the CSST…

In-flight calibration of the Lobster Eye Imager for Astronomy
Huaqing Cheng, Hai-Wu Pan, Yuan Liu, Jingwei Hu, Haonan Yang, Donghua Zhao, Zhixing Ling, He-Yang Liu, Yifan Chen, Xiaojin Sun, Longhui Li, Ge Jin, Chen Zhang, Shuang-Nan Zhang, Weimin Yuan
https://arxiv.org/abs/2506.20369

In-flight calibration of the Lobster Eye Imager for Astronomy
The Lobster Eye Imager for Astronomy (LEIA), as a pathfinder of the Wide-field X-ray Telescope (WXT) onboard the Einstein Probe (EP) satellite, is the first lobster-eye focusing X-ray telescope with a considerably large field-of-view (FoV) ever flown. During the two and half years of operations, a series of calibration observations were performed, to fully characterize its performance and calibrate the instrumental properties. In this paper, we present the results of the in-flight calibration c…

A Glimpse of Satellite Galaxies in the Milky Way with the 2.5-meter Wide Field Survey Telescope (WFST): Bootes III and Draco
Chao Yang, Zhizheng Pan, Min Fang, Xian Zhong Zheng, Binyang Liu, Guoliang Li, Tian-Rui Sun, Ji-An Jiang, Miaomiao Zhang, Zhen Wan, Shuang Liu, Han Qu, Ji Yang, Xu Kong, Wenhao Liu, Yiping Shu, Jiang Chang, Tinggui Wang, Lulu Fan, Yongquan Xue, Wentao Luo, Hongxin Zhang, Zheng Lou, Haibin Zhao, Bin Li, Hairen Wang, Dazhi Yao, Jian Wang, Hongfei Zhang, Feng Li, Ha…

A Glimpse of Satellite Galaxies in the Milky Way with the 2.5-meter Wide Field Survey Telescope (WFST): Bootes III and Draco
We carry out deep imaging of the Milky Way satellite galaxies, Bootes III and Draco, with WFST as one pilot observing program to demonstrate the capability of WFST. Combining catalogs with PS1 DR2 and Gaia DR3, we derive proper motions for candidate member stars in these two satellite galaxies over a 12-year time baseline, yielding uncertainties of ~1.8 mas/yr at 21 mag and ~3.0 mas/yr at 22 mag in the r band. The proper motions derived from bright and faint stars are consistent, indicating no …

Challan: Solar Full-disk Imaging-Spectroscopic Telescope using the Drift-Scanning Technique
Heesu Yang, Maria S. Madjarska, Donguk Song, Hannah Kwak, Sung-Hong Park, Eun-Kyung Lim, Sujin Kim, Su-Chan Bong, Yeon-Han Kim, Seonghwan Choi
https://arxiv.org/abs/2507.16294

Challan: Solar Full-disk Imaging-Spectroscopic Telescope using the Drift-Scanning Technique
The Challan instrument is a solar full-disk imaging spectroscopic telescope planned to be installed at three sites with a 120-degree longitudinal difference, enabling continuous 24-hour observations of the Sun. It will take data every 2.5 min with a spatial resolution of $2-3^{\prime\prime}$ and a spectral resolving power (R) of >43,000 in H$α$ and Ca II 854.2 nm bands simultaneously. Challan is composed of two modules, each dedicated to a specific waveband. This modular design is beneficial i…

Carbon-rich Dust Injected into the #InterstellarMedium by Galactic WC Binaries Survives for Hundreds of Years: https://iopscience.iop.org/article/10.3847/1538-4357/addf30 -> Embry‑Riddle Professor, Undergrads Unlock Secrets of Cosmic Dust With the Webb Telescope: https://news.erau.edu/headlines/embry-riddle-professor-undergrads-unlock-secrets-of-cosmic-dust-with-the-webb-telescope

Emulating redshift-mixing due to blending in weak gravitational lensing
Zekang Zhang, Daniel Gruen, Luca Tortorelli, Shun-Sheng Li, Jamie McCullough
https://arxiv.org/abs/2507.19130

Emulating redshift-mixing due to blending in weak gravitational lensing
Galaxies whose images overlap in the focal plane of a telescope, commonly referred to as blends, are often located at different redshifts. Blending introduces a challenge to weak lensing cosmology probes, as such blends are subject to shear signals from multiple redshifts. This effect can be described by joining shear bias and redshift characterisation in the effective redshift distribution, $n_γ(z)$, which includes the response of apparent shapes of detected objects to shear of galaxies at re…

MINERVA: A NIRCam Medium Band and MIRI Imaging Survey to Unlock the Hidden Gems of the Distant Universe
Adam Muzzin, Katherine A. Suess, Danilo Marchesini, Luke Robbins, Chris J. Willott, Stacey Alberts, Jacqueline Antwi-Danso, Yoshihisa Asada, Gabriel Brammer, Sam E. Cutler, Kartheik G. Iyer, Ivo Labbe, Nicholas S. Martis, Tim B. Miller, Ikki Mitsuhashi, Alexandra Pope, Anna Sajina, Ghassan T. E. Sarrouh, Monu Sharma, Mauro Stefanon, Katherine E. Whitaker, Roberto Abraham, Hakim Atek,…

MINERVA: A NIRCam Medium Band and MIRI Imaging Survey to Unlock the Hidden Gems of the Distant Universe
We present an overview of the MINERVA survey, a 259.8 hour (prime) and 127 hour (parallel) Cycle 4 treasury program on the James Webb Space Telescope (JWST). MINERVA is obtaining 8 filter NIRCam medium band imaging (F140M, F162M, F182M, F210M, F250M, F300M, F360M, F460M) and 2 filter MIRI imaging (F1280W, F1500W) in four of the five CANDELS Extragalactic fields: UDS, COSMOS, AEGIS and GOODS-N. These fields were previously observed in Cycle 1 with 7 - 9 NIRCam filters by the PRIMER, CEERS and JA…

Observation of VER J2019 368 with the SST-1M stereoscopic system
Jakub Jury\v{s}ek (for the SST-1M Collaboration), Thomas Tavernier (for the SST-1M Collaboration), Ana Laura M\"uller (for the SST-1M Collaboration)
https://arxiv.org/abs/2507.16408

Observation of VER J2019+368 with the SST-1M stereoscopic system
The Single-Mirror Small Size Telescope (SST-1M) is a small Cherenkov telescope designed to detect gamma rays with energies more than about 1 TeV. The optical design of the SST-1M follows the Davies-Cotton concept to ensure good off-axis performance. In 2022, two SST-1M telescope prototypes were installed in Ondrejov, Czech Republic, and stereoscopic observations of astrophysical gamma-ray sources have been performed since then. VER J2019+368 is an unidentified very-high-energy (VHE) gamma-ray s…

Bilateral collaboration between Mexico and the United Kingdom for the construction of technical equipment (CHARM) for the Large Millimeter Telescope (LMT/GTM)
Paulina Carmona Rodriguez, Maria de la Paz Ramos-Lara
https://arxiv.org/abs/2506.11489

Bilateral collaboration between Mexico and the United Kingdom for the construction of technical equipment (CHARM) for the Large Millimeter Telescope (LMT/GTM)
The Large Millimeter Telescope Alfonso Serrano (LMT), is the largest millimeter radio telescope in the world, and was founded in 2006. This radio telescope is the final product of a collaboration agreement between Mexico and the United States in the 1990s. It is located on top of an extinct volcano in Mexico at an altitude of 4600 meters above sea level. In 2018, the University of Manchester and the Rutherford Appleton Laboratory signed an agreement with the Instituto Nacional de Astrofisica Op…

VLBI studies of FLASH H I 21-cm absorbers - I
J. N. H. S. Aditya, Elaine M. Sadler, Raffaella Morganti, L. Y. Petrov, An Tao, Emily F. Kerrison, Elizabeth K. Mahony, Hyein Yoon, Renzhi Su, Matthew Whiting, Vanessa A. Moss, Simon Weng
https://arxiv.org/abs/2507.19957

VLBI studies of FLASH H I 21-cm absorbers - I
We have conducted VLBA 1.4 GHz (L-band) continuum observations towards twelve sources with HI 21-cm absorption detections at redshift $0.4

A Joint JWST and HST View of Omega Centauri: Multiple Stellar Populations and Their Kinematics
T. Ziliotto, A. P. Milone, G. Cordoni, A. F. Marino, M. V. Legnardi, E. Dondoglio, E. Bortolan, F. Muratore
https://arxiv.org/abs/2506.21187

A Joint JWST and HST View of Omega Centauri: Multiple Stellar Populations and Their Kinematics
We combine F115W and F277W images collected with the Near Infrared Camera of the James Webb Space Telescope (JWST) with multi-band, multi-epoch Hubble Space Telescope (HST) observations of Omega Centauri to investigate its multiple stellar populations and internal kinematics. Our study focuses on a region spanning $\sim$0.9 to $\sim$2.3 half-light radii from the cluster center, largely unexplored by HST and JWST. Using chromosome maps, we identify the principal populations along the upper main …

Continuous helium absorption from the leading and trailing tails of WASP-107b
Vigneshwaran Krishnamurthy, Yann Carteret, Caroline Piaulet-Ghorayeb, Jared Splinter, Dhvani Doshi, Michael Radica, Louis-Philippe Coulombe, Romain Allart, Vincent Bourrier, Nicolas B. Cowan, David Lafreni\`ere, Lo\"ic Albert, Lisa Dang, Ray Jayawardhana, Doug Johnstone, Lisa Kaltenegger, Adam B. Langeveld, Stefan Pelletier, Jason F. Rowe, Pierre-Alexis Roy, Jake Taylor, Jake D. Turner

Continuous helium absorption from the leading and trailing tails of WASP-107b
The detection of helium escaping the atmosphere of exoplanets has revolutionized our understanding of atmospheric escape and exoplanetary evolution. Using high-precision spectroscopic observations from the James Webb Space Telescope (JWST) NIRISS-SOSS mode, we report the detection of significant helium absorption during the pre-transit phase of WASP-107b (17$σ$), as well as in the transit and post-transit phases. This unique continuous helium absorption begins approximately 1.5 hours before th…

JWST Observations of SN 2023ixf I: Completing the Early Multi-Wavelength Picture with Plateau-phase Spectroscopy
J. M. DerKacy, C. Ashall, E. Baron, K. Medler, T. Mera, P. Hoeflich, M. Shahbandeh, C. R. Burns, M. D. Stritzinger, M. A. Tucker, B. J. Shappee, K. Auchettl, C. R. Angus, D. D. Desai, A. Do, J. T. Hinkle, W. B. Hoogendam, M. E. Huber, A. V. Payne, D. O. Jones, J. Shi, M. Y. Kong, S. Romagnoli, A. Syncatto, S. Moran, E. Fereidouni, P. J. Brown, M. Engesser, O. D. Fox, L. Galb…

JWST Observations of SN 2023ixf I: Completing the Early Multi-Wavelength Picture with Plateau-phase Spectroscopy
We present and analyze panchromatic (0.35-14 $μ$m) spectroscopy of the Type II supernova 2023ixf, including near- and mid-infrared spectra obtained 33.6 days after explosion during the plateau-phase, with the James Webb Space Telescope (JWST). This is the first in a series of papers examining the evolution of SN 2023ixf with JWST spanning the initial 1000 days after explosion, monitoring the formation and growth of molecules and dust in ejecta and surrounding environment. The JWST infrared spe…

The Probable Direct-Imaging Detection of the Stellar Companion to Betelgeuse: [oops, the paper will only go on ArXiv tonight and appear in ApJL on 24 July] -> Gemini North Discovers Long-Predicted Stellar Companion of Betelgeuse: #Betelgeuse, solving millennia-old mystery. The picture here is from the actual paper which has been sent to me ... compare it to the spiced-up version in the press release! The authors themselves say it's only a 1.5 sigma detection but because it fits the expectations for a 'Betel buddy' so well, they believe it. See https://skyweek.wordpress.com/2025/07/17/allgemeines-live-blog-ab-dem-17-juli-2025/#Jul21 for more discussion!

ANTIHEROES-PRODIGE: Quantifying the connection from envelope to disk with the IRAM 30m telescope and NOEMA I. Attack of the streamers: L1448N's fight for order in the chaos
C. Gieser, P. Caselli, D. M. Segura-Cox, J. E. Pineda, L. A. Busch, M. T. Valdivia-Mena, M. J. Maureira, Y. Lin, T. H. Hsieh, Y. R. Chou, L. Bouscasse, P. C. Cort\'es, N. Cunningham, A. Dutrey, A. Fuente, Th. Henning, A. Lopez-Sepulcre, J. Miranzo-Pastor, R. Neri, D. Semenov, M. Tafalla, S. E. van Terwisga

ANTIHEROES-PRODIGE: Quantifying the connection from envelope to disk with the IRAM 30m telescope and NOEMA I. Attack of the streamers: L1448N's fight for order in the chaos
Star formation is a hierarchical process ranging from molecular clouds down to individual protostars. In particular how infalling asymmetric structures, called streamers, delivering new material onto protostellar systems, are connected to the surrounding envelope is not understood. We investigate the connection between the cloud material at 10000 au scales down to 300 au scales towards L1448N in the Perseus star-forming region hosting three young Class 0/I protostellar systems. Sensitive molecu…

Investigating the Influence of Asymmetric Errors on Retrievals of Exoplanet Transmission Spectra
Jack J. Davey, Kai Hou Yip, Quentin Changeat, Ingo P. Waldmann
https://arxiv.org/abs/2507.19223

Investigating the Influence of Asymmetric Errors on Retrievals of Exoplanet Transmission Spectra
In studies of exoplanet atmospheres using transmission spectroscopy, Bayesian retrievals are the most popular form of analysis. In these procedures it is common to adopt a Gaussian likelihood. However, this implicitly assumes that the upper and lower error bars on the spectral points are equal. With recent observations from the James Webb Space Telescope (JWST) offering higher quality of data, it is worth revisiting this assumption to understand the impact that an asymmetry between the error ba…

The #GiantMagellanTelescope received official approval from the National Science Foundation (NSF) confirming that the observatory will advance into its Major Facilities Final Design Phase, one of the final steps before becoming eligible for federal construction funding: https://astro.arizona.edu/news/giant-magellan-telescope-advances-national-science-foundation-final-design-phase

The SST-1M stereoscopic system
C. Alispach, A. Araudo, M. Balbo, V. Beshley, J. Bla\v{z}ek, J. Borkowski, S. Boula, T. Bulik, F. Cadoux, S. Casanova, A. Christov, J. Chudoba, L. Chytka, P. \v{C}echvala, P. D\v{e}dic, D. della Volpe, Y. Favre, M. Garczarczyk, L. Gibaud, T. Gieras, E. G{\l}owacki, P. Hamal, M. Heller, M. Hrabovsk\'y, P. Jane\v{c}ek, M. Jel\'inek, V. J\'ilek, J. Jury\v{s}ek, V. Karas, B. Lacave, E. Lyard, E. Mach, D. Mand\'at, W. Marek, S. Michal, J. Micha…

The SST-1M stereoscopic system
The Single-Mirror Small-Size Telescope (SST-1M) is an Imaging Atmospheric Cherenkov Telescope designed for detecting very high-energy gamma rays. With a compact design achieved through the adoption of silicon-photomultiplier pixels and a lightweight structure, SST-1M offers a large field of view of about 9° and features a mirror system of 4 m diameter with an optical PSF (at 80% of photon inclusion) of 0.08° on axis and 0.21° at 4° off-axis, and a fully digitizing readout almost deadtime fr…

SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
E. Camphuis, W. Quan, L. Balkenhol, A. R. Khalife, F. Ge, F. Guidi, N. Huang, G. P. Lynch, Y. Omori, C. Trendafilova, A. J. Anderson, B. Ansarinejad, M. Archipley, P. S. Barry, K. Benabed, A. N. Bender, B. A. Benson, F. Bianchini, L. E. Bleem, F. R. Bouchet, L. Bryant, M. G. Campitiello, J. E. Carlstrom, C. L. Chang, P. Chaubal, P. M. Chichura, A. Chokshi, T.…

SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
We present measurements of the temperature and E-mode polarization angular power spectra of the cosmic microwave background (CMB) from observations of 4% of the sky with SPT-3G, the current camera on the South Pole Telescope (SPT). The maps used in this analysis are the deepest used in a CMB TT/TE/EE analysis to date. The maps and resulting power spectra have been validated through blind and unblind tests. The measurements of the lensed EE and TE spectra are the most precise to date at l=1800-4…

The MALATANG survey: Dense gas distribution on sub-kiloparsec scales across the disk of M82
Jian-Fa Wang, Yu Gao, Xue-Jian Jiang, Li Ji, Zhi-Yu Zhang, Jun-Zhi Wang, Jun-Feng Wang, R. Thomas Greve, Yan Jiang, Ashley Bemis, Elias Brinks, Aeree Chung, J. Malcolm Currie, Richard de Grijs, Taotao Fang, C. Luis Ho, Bumhyun Lee, Satoki Matsushita, Micha{\l} Micha{\l}owski, Soojong Pak, Panomporn Poojon, G. Mark Rawlings, Amelie Saintonge, Yi-Chen Sun, Jing Zhou

The MALATANG survey: Dense gas distribution on sub-kiloparsec scales across the disk of M82
We present observations of HCN J=4-3 and HCO^+ J=4-3 lines obtained with the James Clerk Maxwell Telescope as part of the MALATANG survey, combined with archival HCN J=1-0 and HCO^+ J=1-0 data from the Green Bank Telescope, to study the spatial distribution and excitation conditions of dense molecular gas in the disk of M82. We detect HCN J=4-3 and HCO^+ J=4-3 emission within the central region (< 500 pc) of the galaxy, while the J=1-0 emission lines exhibit a more extended spatial distribution…

Hunting for UVdim stars in Galactic Open clusters. Clues from ultraviolet photometry
G. Cordoni, A. P. Milone, L. Casagrande, L. Venuti, E. P. Lagioia, F. Muratore, A. F. Marino, G. S. Da Costa, F. Dell'Agli, F. D'Antona
https://arxiv.org/abs/2506.21519

Hunting for UVdim stars in Galactic Open clusters. Clues from ultraviolet photometry
Split main-sequences (MSs) and extended main-sequence turn-offs (eMSTOs) have been observed in nearly all Magellanic Clouds clusters younger than 2 Gyr. More recently, Hubble Space Telescope (HST) ultraviolet photometry uncovered a puzzling new population of UV-absorbed stars, dubbed UVdim, in five Magellanic Clouds clusters aged between 40 and 200 Myr, as well as in one 1.5 Gyr-old cluster. These UVdim stars predominantly lie on the blue MS, which is composed of slow rotators, and their distin…

The Striated Solar Photosphere Observed at 0.03" Resolution: #Sun: https://nso.edu/press-release/magnetic-curtains-on-the-sun-nsf-inouye-solar-telescope-reveals-ultra-fine-striations-in-solar-surface/ - NSF Inouye Solar Telescope Reveals Ultra-Fine Striations in Solar Surface.

Prospects for radio weak lensing: studies using LOFAR observations in the ELAIS-N1 field
Jinyi Liu, Reinout van Weeren, Huub Rottgering, Konrad Kuijken
https://arxiv.org/abs/2506.20845

Prospects for radio weak lensing: studies using LOFAR observations in the ELAIS-N1 field
We carry out a shape and weak lensing analysis of Low Frequency Array (LOFAR) radio sources and Hyper Suprime-Cam (HSC) optical sources within the European Large Area Infrared Space Observatory Survey-North 1 (ELAIS-N1) field. Using HSC data alone, we detect a cosmic shear correlation signal at a significance of $\sim$$9σ$ over a $\sim$$6.4$ deg$^2$ region. For the radio dataset, we analyse observations from both the LOFAR Two Metre Sky Survey (LoTSS) and the International LOFAR Telescope (ILT…

Deep learning inference with the Event Horizon Telescope I. Calibration improvements and a comprehensive synthetic data library
M. Janssen, C. -k. Chan, J. Davelaar, I. Natarajan, H. Olivares, B. Ripperda, J. R\"oder, M. Rynge, M. Wielgus
https://arxiv.org/abs/2506.13873

Deep learning inference with the Event Horizon Telescope I. Calibration improvements and a comprehensive synthetic data library
(abridged) In a series of publications, we describe a comprehensive comparison of Event Horizon Telescope (EHT) data with theoretical models of Sgr A* and M87*. Here, we report on improvements made to our observational data reduction pipeline and present the generation of observables derived from the EHT models. We make use of ray-traced GRMHD simulations that are based on different black hole spacetime metrics and accretion physics parameters. These broad classes of models provide a good repre…

Signatures of Exploding Supermassive PopIII Stars at High Redshift in JWST, EUCLID and Roman Space Telescope
C\'edric Jockel, Kyohei Kawaguchi, Sho Fujibayashi, Masaru Shibata
https://arxiv.org/abs/2507.15556

Signatures of Exploding Supermassive PopIII Stars at High Redshift in JWST, EUCLID and Roman Space Telescope
Recently discovered supermassive black holes with masses of $\sim10^8\,M_\odot$ at redshifts $z\sim9$-$11$ in active galactic nuclei (AGN) pose severe challenges to our understanding of supermassive black hole formation. One proposed channel are rapidly accreting supermassive PopIII stars (SMSs) that form in large primordial gas halos and grow up to $<10^6\,M_\odot$. They eventually collapse due to the general relativistic instability and could lead to supernova-like explosions. This releases m…

Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458b
N. Bachmann, L. Kreidberg, P. Molli\`ere, D. Deming, S. -M. Tsai
https://arxiv.org/abs/2506.16232

Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458b
HD 209458b is the prototypical hot Jupiter and one of the best targets available for precise atmosphere characterisation. Now that spectra from both Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) are available, we can reveal the atmospheric properties in unprecedented detail. In this study, we perform a new data reduction and analysis of the original HST/WFC3 spectrum, accounting for the wavelength dependence of the instrument systematics that was not considered in previous …

Probing Equatorial Ionospheric TEC at Sub-GHz Frequencies with Wide-Band (B4) uGMRT Interferometric Data
Dipanjan Banerjee, Abhik Ghosh, Sushanta K Mondal, Parimal Ghosh
https://arxiv.org/abs/2506.20690

Probing Equatorial Ionospheric TEC at Sub-GHz Frequencies with Wide-Band (B4) uGMRT Interferometric Data
Phase stability at low radio frequencies is severely impacted by ionospheric propagation delays. Radio interferometers such as the Giant Metrewave Radio Telescope (GMRT) are capable of detecting changes in the ionosphere's total electron content (TEC) over larger spatial scales and with greater sensitivity compared to conventional tools like the Global Navigation Satellite System (GNSS). Thanks to its unique design featuring both a dense central array and long outer arms-and its strategic locat…

New bounds on Axion-Like Particles in the Ultraviolet from Legacy Data
Elisa Todarello
https://arxiv.org/abs/2506.19962 https://arxiv…

New bounds on Axion-Like Particles in the Ultraviolet from Legacy Data
We use legacy data from the Hubble Space Telescope (HST) and the International Ultraviolet Explorer (IUE) to search for a spectral line from the spontaneous decay of axion-like particle (ALP) dark matter. The HST data consists of blank sky observations taken with the Faint Object Spectrograph in the 165-240~nm wavelength range, while the IUE data consists of observations of the Virgo Cluster obtained with the long- and short-wavelength spectrographs, covering 195-325~nm and 123-200~nm, respecti…

NGC 6860, Mrk 915 and MCG -01-24-012. I. Spatial anti-correlation between cold molecular and ionized gas distributions in Seyfert galaxies
Bruno Dall'Agnol de Oliveira, Thaisa Storchi-Bergmann, Neil Nagar, Santiago Garcia-Burillo, Rogemar A. Riffel, Dominika Wylezalek, Pranav Kukreti, Venkatessh Ramakrishnan
https://arxiv.org/abs/2507.…

NGC 6860, Mrk 915 and MCG -01-24-012. I. Spatial anti-correlation between cold molecular and ionized gas distributions in Seyfert galaxies
We present a study of the cold molecular versus the ionized gas distribution in three nearby Seyfert galaxies: NGC 6860, Mrk 915 and MCG -01-24-012. To constrain the cold molecular flux distribution at $\sim$ 0.5 - 0.8$^{\prime\prime}$ ($\sim$ 150 - 400 pc) scales, we used data from the CO(2-1) emission line, obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). For the ionized gas, we used Hubble Space Telescope (HST) narrow-band images, centered on the [O III]$λλ$4959,5007 …

Silicate clouds and a circumplanetary disk in the YSES-1 #exoplanet system: https://www.nature.com/articles/s41586-025-09174-w.epdf?sharing_token=RRmxpt1H4UGfhsYggN3LidRgN0jAjWel9jnR3ZoTv0MsHgms7qJzLfZGfJR11eb-vvEQdUtgFRiob9i301fI7DuGo7WWpkZLKlBCdxpBK5AtQvipTF21oU1Tw3IfH_O299ja-Dy3Oo4o1Q5VRXUCWJTPdjQkwk4zJQSkuuzQX2KL605kQMDx_pt1BkUCYmaMuZtqUaPN5_fJM4TPjD9jmnj-omY7Blc5Ec9TOMsfMKyPlLhSsEPzgSnJUW1HLYkK77XpgEtFG9-NFAgx02m_lsc8Ieb6pLEOQVNzzni3RmECgd88noZtE_Xg2P3BIsbi&tracking_referrer=www.theguardian.com -> Astronomers left puzzled by high-altitude clouds forming on young planet: https://www.theguardian.com/science/2025/jun/10/astronomers-space-telescope-clouds-planet - experts say thick slabs of cloud in YSES-1 system could consist of mineral dust and iron, which would rain down.

Excitation of the non-resonant streaming instability around sources of Ultra-High Energy Cosmic Rays
Alessandro Cermenati, Roberto Aloisio, Pasquale Blasi, Carmelo Evoli
https://arxiv.org/abs/2506.20646

Excitation of the non-resonant streaming instability around sources of Ultra-High Energy Cosmic Rays
The interpretation of the ultra-high-energy cosmic ray spectrum (UHECRs) and composition suggests a suppression of the flux below $\sim$1 EeV, as observed by the Pierre Auger Observatory and Telescope Array. A natural explanation for this phenomenon involves magnetic confinement effects. We investigate the possibility that UHECRs self-generate the magnetic turbulence necessary for such confinement via current-driven plasma instabilities. Specifically, we show that the electric current produced …

28 Years of Sun-as-a-star Extreme Ultraviolet Light Curves from SOHO EIT
Emily Sandford, Fr\'ed\'eric Auch\`ere, Annelies Mortier, Laura A. Hayes, Daniel M\"uller
https://arxiv.org/abs/2506.18990

28 Years of Sun-as-a-star Extreme Ultraviolet Light Curves from SOHO EIT
The Solar and Heliospheric Observatory (SOHO) Extreme-ultraviolet Imaging Telescope (EIT) has been taking images of the Solar disk and corona in four narrow EUV bandpasses (171Å, 195Å, 284Å, and 304Å) at a minimum cadence of once per day since early 1996. The time series of fully-calibrated EIT images now spans approximately 28 years, from early 1996 to early 2024, covering solar cycles 23, 24, and the beginning of cycle 25. We convert this extensive EIT image archive into a time series of …

The Low Mass Dwarf Host Galaxy of Non-Repeating FRB 20230708A
August R. Muller (Maria Mitchell Observatory, Max Planck Institute for Gravitational Physics), Alexa C. Gordon (Northwestern University), Stuart D. Ryder (Macquarie University), Alexandra G. Mannings (University of California Santa Cruz), J. Xavier Prochaska (University of California Santa Cruz, Kavli Institute for the Physics and Mathematics of the Universe, National Astronomical Observatory of Japan), Keith W. Bannister (C…

The Low Mass Dwarf Host Galaxy of Non-Repeating FRB 20230708A
We present Very Large Telescope/X-Shooter spectroscopy for the host galaxies of 12 fast radio bursts (FRBs) detected by the Australian SKA Pathfinder (ASKAP) observed through the ESO Large Programme "FURBY", which imposes strict selection criteria on the included FRBs and their host galaxies to produce a homogeneous and well-defined sample. We describe the data reduction and analysis of these spectra and report their redshifts, line-emission fluxes, and derived host properties. From the present…

The Jet Origin of the Mid-infrared Excess in the Black Hole V404 Cygni in Quiescence
E. S. Borowski, R. I. Hynes, Q. Hunt, A. J. Tetarenko, R. M. Plotkin, T. Shahbaz, P. Gandhi, T. J. Maccarone, J. C. A. Miller-Jones, C. O. Heinke, A. W. Shaw, T. D. Russell, G. R. Sivakoff, P. A. Charles, E. V. Palaiologou, P. Reig
https://arxiv…

The Jet Origin of the Mid-infrared Excess in the Black Hole V404 Cygni in Quiescence
Observations of some quiescent black hole X-ray binaries have revealed an excess of mid-infrared (MIR) emission above that expected from their donor stars. In one system, V404 Cygni, this excess has been variously suggested to arise from the accretion disk, circumbinary material, or a compact relativistic jet. Here we present simultaneous James Webb Space Telescope (JWST), Atacama Large Millimeter/submillimeter Array (ALMA), and complementary multi-wavelength observations undertaken to resolve …

Introduction to the China Space Station Telescope (CSST)
CSST Collaboration, Yan Gong, Haitao Miao, Hu Zhan, Zhao-Yu Li, Jinyi Shangguan, Haining Li, Chao Liu, Xuefei Chen, Haibo Yuan, Jilin Zhou, Hui-Gen Liu, Cong Yu, Jianghui Ji, Zhaoxiang Qi, Jiacheng Liu, Zigao Dai, Xiaofeng Wang, Zhenya Zheng, Lei Hao, Jiangpei Dou, Yiping Ao, Zhenhui Lin, Kun Zhang, Wei Wang, Guotong Sun, Ran Li, Guoliang Li, Youhua Xu, Xinfeng Li, Shengyang Li, Peng Wu, Jiuxing Zhang, Bo Wang, Jinming Bai, Yi-Fu…

Introduction to the China Space Station Telescope (CSST)
The China Space Station Telescope (CSST) is a next-generation Stage-IV sky survey telescope, distinguished by its large field of view (FoV), high image quality, and multi-band observation capabilities. It can simultaneously conduct precise measurements of the Universe by performing multi-color photometric imaging and slitless spectroscopic surveys. The CSST is equipped with five scientific instruments, i.e. Multi-band Imaging and Slitless Spectroscopy Survey Camera (SC), Multi-Channel Imager (M…

The #interstellar #comet #ATLAS with a 2-meter telescope, from the AT "Deep g'-band Imaging of Interstellar Comet 3I/ATLAS from the Two-meter Twin Telescope (TTT)" https://www.astronomerstelegram.org/?read=17264 - other observations were reported in https://www.astronomerstelegram.org/?read=17263 ("Interstellar Interloper C/2025 N1 is Active"), and there are a short JPL video at https://www.youtube.com/watch?v=-vzafaw0t08 and ESA and NASA press releases in https://www.esa.int/Space_Safety/Planetary_Defence/ESA_tracks_rare_interstellar_comet and https://science.nasa.gov/blogs/planetary-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/

The Importance of the Population III Initial Mass Function in Determining the Characteristics of the Earliest Galaxies
Richard Sarmento, Evan Scannapieco
https://arxiv.org/abs/2506.20767

The Importance of the Population III Initial Mass Function in Determining the Characteristics of the Earliest Galaxies
We use large-scale cosmological simulations to study the prospect of observing Population III (Pop III) bright galaxies with the James Webb Space Telescope (JWST). To quantify the impact of radiative transfer (RT), we compare a simulation that includes moment-based RT with one in which RT is handled approximately. Both simulations include a subgrid model of turbulent mixing, which is essential in tracking the formation of Pop III stars. We find that RT has a minor impact on our results and that…

Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS
O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, M. H. Israel, K. Kasahara, J. Kat…

Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS
The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray (CR) iron and sub-iron events over a wide energy interval. In this paper we report an update of our previous measurement of the iron flux and we present - for the first time - a high statistics measurement of the spectra of two sub-iron elements Cr and Ti in the energy interval from 10 to 250 GeV/n. The analyses are based on 8 years of data. Differently…

Accreted Globular Clusters and Horizontal Branch Morphology in the Outer Halo of M31
Gracie McGill, Annette M. N. Ferguson, Dougal Mackey, Avon P. Huxor, Geraint F. Lewis, Nicolas F. Martin, Alan W. McConnachie, Charli M. Sakari, Nial R. Tanvir, Kim A. Venn
https://arxiv.org/abs/2506.21267…

Accreted Globular Clusters and Horizontal Branch Morphology in the Outer Halo of M31
M31 hosts a rich population of outer halo ($R_{\rm{proj}} > 25$ kpc) globular clusters (GCs), many of which show strong evidence for spatial and/or kinematical associations with large-scale tidal debris features. We present deep Hubble Space Telescope photometry of 48 halo GCs, including 18 with clear ties to stellar streams and 13 with potential associations. Using the colour-magnitude diagrams (CMDs), we quantify the horizontal branch (HB) morphologies and employ new empirical relationships, …

On the Energy Distribution of the Galactic Center Excess' Sources
Florian List, Yujin Park, Nicholas L. Rodd, Eve Schoen, Florian Wolf
https://arxiv.org/abs/2507.17804 https…

On the Energy Distribution of the Galactic Center Excess' Sources
The Galactic Center Excess (GCE) remains one of the defining mysteries uncovered by the Fermi $γ$-ray Space Telescope. Although it may yet herald the discovery of annihilating dark matter, weighing against that conclusion are analyses showing the spatial structure of the emission appears more consistent with a population of dim point sources. Technical limitations have restricted prior analyses to studying the point-source hypothesis purely spatially. All spectral information that could help d…

Balmer Decrement and IRX Break in Tracing Dust Attenuation at Scales of Individual Star-forming Regions in NGC 628
Man Qiao, Mingfeng Liu, Zongfei Lyu, Shuang Liu, Chao Yang, Dong Dong Shi, Fangxia An, Zhizheng Pan, Wenhao Liu, Binyang Liu, Run Wen, Yu Heng Zhang, Xian Zhong Zheng
https://arxiv.org/abs/2506.21026

Balmer Decrement and IRX Break in Tracing Dust Attenuation at Scales of Individual Star-forming Regions in NGC 628
We investigate the relationships between infrared excess (IRX=$L_{\rm IR}/L_{\rm UV}$) and Balmer decrement (${\rm H}α/{\rm H}β$) as indicators of dust attenuation for 609 ${\rm {H\,{\small II}}}$ regions at scales of $\sim 50-200$ pc in NGC 628, utilizing data from AstroSat, James Webb Space Telescope (JWST) and Multi Unit Spectroscopic Explorer (MUSE). Our findings indicate that about three fifths of the sample ${\rm {H\,{\small II}}}$ regions reside within the regime occupied by local star…

Finding strangelets in cosmic rays from HESS J1731-347, a possible strange quark star using the Cherenkov Telescope Array Observatory
C. R. Das
https://arxiv.org/abs/2507.12817

Finding strangelets in cosmic rays from HESS J1731-347, a possible strange quark star using the Cherenkov Telescope Array Observatory
The hypothesis that supernova remnants are key sources of Galactic cosmic rays gains support from evidence that HESS J1731-347 one of the few Galactic objects capable of accelerating hadronic cosmic rays to TeV energies may harbor an exotic strange quark star rather than a conventional neutron star. This conclusion stems from its unusually low mass and compact radius, which challenge standard neutron star models. If confirmed, such a quark star could generate cosmic rays through the transition …

Results of 15-Year Pulsar Timing of PSR J0007 7303 with Fermi-LAT
Zhi-xiang Yu, Shi-jun Dang, Wei-hua Wang, Lin Li, Wei Li, Jian-ping Yuan, Fei-fei Kou, Jun-tao Bai, Mingyu Ge, Xia Zhou, Lun-hua Shang, Zu-rong Zhou, Yu-bin Wang, Yan-qing Cai, Ru-shuang Zhao, Qing-ying Li, Xiang-dong Zeng, Na Wang
https://arxiv.org/abs/2507.18187

Results of 15-Year Pulsar Timing of PSR J0007+7303 with Fermi-LAT
The study of pulsar glitches provides a unique window into the internal structure and dynamic processes of neutron stars. PSR J0007+7303, a very bright gamma-ray pulsar, is the first pulsar discovered by the Fermi-LAT telescope. In this paper, we present the 15 years of timing results of this pulsar using the Fermi-LAT data. We identified nine glitches, five of which are newly discovered. Among these, two are small glitches, occurring between the three previously reported ones, while the other …