Tootfinder

A languid spiral galaxy appears draped against deep space in a stunning new image from the European Space Agency’s Euclid telescope.
Euclid launched in 2023 on a six-year mission to map the cosmos at scale,
observing billions of galaxies stretching as far away as 10 billion light-years from Earth.
The effort could reveal how galaxies form and evolve and how the universe has expanded over its 13.8-billion-or-so-year history.

Sparkling Galaxy Merger Shines in New Euclid Space Telescope Image
The Euclid Space Telescope is decking the halls with boughs of starlight

Technical Memo: The impact of Nancy Grace Roman Telescope's default image processing on the detectability of moving Solar system objects
Joseph Masiero (Caltech/IPAC)
https://arxiv.org/abs/2509.20469

Technical Memo: The impact of Nancy Grace Roman Telescope's default image processing on the detectability of moving Solar system objects
The Nancy Grace Roman Telescope is scheduled to launch in 2026 to conduct a wide-field survey of the sky at near-infrared wavelengths. Although Roman is unable to track objects moving at non-sidereal rates, there is recent interest in the potential capability of the telescope to support planetary defense by tracking and characterizing asteroids and comets (Holler et al, 2025, arXiv:2508.14412). However, the standard pipeline image processing scheme that the mission is planning to implement for …

Unveiling a Population of Strong Galaxy–Galaxy Lensed, Faint Dusty Star-forming #Galaxies: https://iopscience.iop.org/article/10.3847/2041-8213/adfa88 -> James Clerk Maxwell Telescope Helps Discover 13 Distant, Dusty Galaxies: https://www.maunakeaobservatories.org/stories/james-clerk-maxwell-telescope-helps-discover-13-distant-dusty-galaxies

Performance of LACT Array: Instrument Response Functions and Source Prospects
Zhipeng Zhang, Ruizhi Yang, Shoushan Zhang
https://arxiv.org/abs/2509.20694 https://

Performance of LACT Array: Instrument Response Functions and Source Prospects
Large Array of imaging atmospheric Cherenkov Telescope (LACT) is an array of 32 Cherenkov telescopes with 6-meter diameter mirrors to be constructed at the LHAASO site, aiming to enhance our understanding of ultra-high energy gamma ray astronomy. This work presents a detailed performance assessment of the LACT array, focusing on the IRFs for both an 8-telescope subarray configuration optimized for large zenith angle observations (60°) and the full 32-telescope array, with a particular emphasis…

Oh! Look, we are getting Christmas visitors!
I asked if they aren't a bit late. But the Grey answered that a wizard is never late. He is also not too early. Wizards arrive just in time.
Well, let's see.
#Lego

On-sky Demonstration of #Subdiffraction-limited Astronomical Measurement Using a #PhotonicLantern: #Telescope hack opens a sharper view into the universe: https://newsroom.ucla.edu/releases/telescope-hack-peers-deeper-into-universe - it is the first time the novel imaging technique has been used on telescopes.

"Astronomers have made a truly mind-boggling discovery using the James Webb Space Telescope (JWST): a runaway black hole 10 million times larger than the sun, rocketing through space at a staggering 2.2 million miles per hour (1,000 kilometers per second).
That not only makes this the first confirmed runaway supermassive black hole, but this object is also one of the fastest-moving bodies ever detected..."

James Webb Space Telescope confirms 1st 'runaway' supermassive black hole rocketing through 'Cosmic Owl' galaxies at 2.2 million mph: 'It boggles the mind!'
"The forces that are needed to dislodge such a massive black hole from its home are enormous."

"How SETI Designed A Telescope To Look For Extraterrestrial Civilizations" – Scott Manley
https://www.youtube.com/watch?v=qnWR7A0Qiy8

The Atacama #Cosmology Telescope: DR6 maps / power spectra, likelihoods and ΛCDM parameters / constraints on extended cosmological models: https://iopscience.iop.org/article/10.1088/1475-7516/2025/11/061 / https://iopscience.iop.org/article/10.1088/1475-7516/2025/11/062 / https://iopscience.iop.org/article/10.1088/1475-7516/2025/11/063 -> ACT releases its final data, shaping the future of cosmology: https://www.eurekalert.org/news-releases/1106637

In 1588, Galileo had not yet looked through a telescope.
Microscopes, pendulum clocks, barometers, and steam pumps were decades away.
Francis Bacon,
a member of parliament still in his twenties,
was only beginning his writing on science.
Robert Boyle wouldn’t be born for another 39 years,
Isaac Newton for another 55.
But a subtle shift in perspective was already taking place,
heralding the
‘culture of growth’
that would blossom i…

The Renaissance book that heralded growth - Works in Progress Magazine
Long before modern science, Europeans learned to see their own time as an age of invention rather than decline.

Einstein@Home Searches for Gamma-ray Pulsars in the Inner Galaxy
C. J. Clark, M. Di Mauro, J. Wu, B. Allen, O. Behnke, H. B. Eggenstein, B. Machenschalk, L. Nieder, P. M. Saz Parkinson, A. Ashok, P. Bruel, B. McGloughlin, M. A. Papa, F. Camilo, M. Kerr, P. Voraganti Padmanabh, S. M. Ransom
https://arxiv.org/abs/2509.21307

Einstein@Home Searches for Gamma-ray Pulsars in the Inner Galaxy
The Fermi Large Area Telescope (LAT) has revealed a mysterious extended excess of GeV gamma-ray emission around the Galactic Center, which can potentially be explained by unresolved emission from a population of pulsars, particularly millisecond pulsars (MSPs), in the Galactic bulge. We used the distributed volunteer computing system Einstein@Home to search the Fermi-LAT data for gamma-ray pulsations from sources in the inner Galaxy, to try to identify the brightest members of this putative pop…

"Space Advent Calendar"
https://www.theatlantic.com/photography/2025/12/2025-space-telescope-advent-calendar/685096/?g…

2025 Space Telescope Advent Calendar
Welcome to the 18th annual Space Telescope Advent Calendar, featuring remarkable images from NASA’s Hubble Space Telescope and James Webb Space Telescope. Every day until December 25, this page will present a new image of our universe.

Updated at 11:55 a.m. ET on December 6, 2025

One can search the brain with a microscope and not find the
mind, and can search the stars with a telescope and not find God.
-- J. Gustav White

Millisecond Pulsar Discoveries in an Image-based MeerKAT Survey of the Galactic Bulge
Rahul Sengar, Akash Anumarlapudi, David L. Kaplan, Dale A. Frail, Scott D. Hyman, Emil Polisensky
https://arxiv.org/abs/2509.20614

Millisecond Pulsar Discoveries in an Image-based MeerKAT Survey of the Galactic Bulge
We report on the follow-up observations of circularly polarized sources identified in the MeerKAT image-based survey of the Galactic bulge. Using the Parkes radio telescope, we observed sixteen circularly polarized sources with the UWL receiver and detected nine pulsars among which six of them are new discoveries. All pulsars are fast rotators with spin periods under 100\,ms. Among the new discoveries five are millisecond pulsars (MSPs) and one has a spin period of 55\,ms. At least four new MSP…

First of Its Kind: Webb Telescope Spots a Planet Losing Its Atmosphere
https://scitechdaily.com/first-of-its-kind-webb-telescope-spots-a-planet-losing-its-atmosphere/

Retrieval of Interior Structure of #Asteroids with the Low-Frequency Telescope DART: https://spj.science.org/doi/10.34133/space.0180 -> summary: https://www.eurekalert.org/news-releases/1110111

Discovery of Two Highly Scattered Pulsars from Image-Based Circular Polarization Searches with the Australian SKA Pathfinder
Rahul Sengar, David L. Kaplan, Emil Lenc, Akash Anumarlapudi, Natasha Hurley-Walker, Ziteng Wang, Laura Driessen, Dougal Dobie, Tara Murphy
https://arxiv.org/abs/2509.20611

Discovery of Two Highly Scattered Pulsars from Image-Based Circular Polarization Searches with the Australian SKA Pathfinder
We report the discovery and timing of two pulsars from a sample of four circularly polarized sources identified in radio continuum images taken as part of the Australian SKA Pathfinder (ASKAP) Variables and Slow Transients (VAST) survey. Observations with the Parkes (Murriyang) radio telescope confirmed both sources as normal pulsars with high dispersion measures. PSR J1646$-$4451 has a spin period of 217 ms and a dispersion measure (DM) of 928 $\rm cm^{-3} \, pc$, while PSR J1837$-$0616 exhibi…

LAP1-B is the First Observed System Consistent with Theoretical Predictions for Population III Stars
#Astrophysics

LAP1-B is the First Observed System Consistent with Theoretical Predictions for Population III Stars
Recently, Nakajima et al. (2025) presented James Webb Space Telescope observations of the $z=6.6$ Population III (Pop III) candidate LAP1-B, which is gravitationally lensed by galaxy cluster MACS J0416. We argue that this is the first object to agree with three key theoretical predictions for Pop III stars: (1) formation in extremely low-metallicity halos with virial temperatures ranging from $T_{\rm vir}\sim 10^3-10^4~{\rm K}$, (2) a top-heavy initial mass function, and (3) formation of low-ma…

Thread about gifting (or buying yourself) a telescope and avoiding getting something terrible.
(sorry for Bluesky link but I’m auto-removing posts on Mastodon, this is from last year)
https://bsky.app/profile/thomasfuchs.at/post/3lbx2egm5222k

Abundances of Rarely Detected s-process Elements Derived from the Ultraviolet Spectrum of the s-process-enhanced Metal-poor Star HD 196944
Ian U. Roederer, Vinicius M. Placco, Amanda I. Karakas, Elizabeth A. Den Hartog, Timothy C. Beers
https://arxiv.org/abs/2510.11922

Abundances of Rarely Detected s-process Elements Derived from the Ultraviolet Spectrum of the s-process-enhanced Metal-poor Star HD 196944
We present an analysis of the heavy-element abundances of HD 196944, a carbon-enhanced metal-poor (CEMP) star enriched with elements produced by the slow neutron-capture process (s-process). We obtained a new high-resolution ultraviolet (UV) spectrum of this star, the UV-brightest known CEMP-s star, with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. This spectrum extends deeper into the UV (2029 < lambda < 2303 Angstroms) than previous studies of any CEMP-s star.…

Widespread Hot Molecular Gas Heated by Shear-induced Turbulence in the Galactic Center
Juan Li, Junzhi Wang, Zhiqiang Shen, Alba Vidal-Garcia, Yuqiang Li, DI Li, Liubin Pan, Lei Huang, Fengyao Zhu, Siqi Zheng, Yiping Ao, Alvaro Sanchez-Momge, Zhiyu Zhang, Xing Lu, Tie Liu, Xingwu Zheng
https://arxiv.org/abs/2510.12518

Widespread Hot Molecular Gas Heated by Shear-induced Turbulence in the Galactic Center
We observed NH3 metastable inversion lines from (3, 3) to (18, 18) toward G0.66-0.13 in the Galactic center with the Shanghai Tianma 65m radio telescope and Yebes 40 m telescope. Highly-excited lines of NH3 (17, 17), (18, 18) were detected in emission for the first time in the interstellar medium, with upper energy levels up to 3100 K. Mapping observations reveal widespread hot molecular gas traced by NH3 (13, 13) toward G0.66-0.13. The rotation temperatures of hot gas traced by NH3 exceed 400 …

Revisiting the Orbital Dynamics of the Hot Jupiter WASP-12b with New Transit Times
Shraddha Biswas, Ing-Guey Jiang, Li-Chin Yeh, Hsin-Min Liu, Kaviya Parthasarathy, D. Bisht, Sandip K Chakrabarti, D Bhowmick, Mohit Singh Bisht, A. Raj, Bryan E. Martin, R. K. S. Yadav, Geeta Rangwal
https://arxiv.org/abs/2510.06589

Revisiting the Orbital Dynamics of the Hot Jupiter WASP-12b with New Transit Times
In this study, we examine the transit timing variations (TTVs) of the extensively studied hot Jupiter WASP-12b using a comprehensive dataset of 391 transit light curves. The dataset includes 7 new photometric observations obtained with the 1.3 m Devasthal Fast Optical Telescope, the 0.61 m VASISTHA telescope, and the 0.3 m AG Optical IDK telescope, along with 119 light curves from the Transiting Exoplanet Survey Satellite (TESS), 97 from the Exoplanet Transit Database (ETD), 34 from the ExoCloc…

Reconstruction of Energy of Ultra-High-Energy Cosmic Rays Registered with a Fluorescence Telescope: One Time Frame Might Be Enough
Mikhail Zotov (for the JEM-EUSO collaboration), Andrei Trusov (for the JEM-EUSO collaboration)
https://arxiv.org/abs/2510.10783

Reconstruction of Energy of Ultra-High-Energy Cosmic Rays Registered with a Fluorescence Telescope: One Time Frame Might Be Enough
We address the challenge of reconstructing the energy of three ultra-high-energy cosmic rays registered with a small fluorescence telescope EUSO-TA that operated in 2015 at the site of the Telescope Array experiment in Utah, USA. Each of these events was recorded within one time frame. Conventional methods of energy reconstruction are not applicable in this case because the events do not have light curves but a single data point. As an alternative, we consider a number of approaches based on ar…

For good or ill we have a business account with Verizon for our cell phones. At one of our locations the Verizon cell tower is so far away that we can only get their signal by via astronomical radio telescope (there is another cell tower 500 yards away but Verizon has no radios on it.)
Anyway that means that Verizon gave is a tiny cell tower - a Samsung 4G/LTE Extender 2 - that sits in our house that backhauls via our Comcast home network. (Really.)
Well, that Verizon device is…

Full #moon with smartphone through a 25€ telescope. 😎

Impact of facility timing and coordination for next-generation gravitational-wave detectors
Ssohrab Borhanian, Arianna Renzini, Philippa S. Cole, Costantino Pacilio, Michele Mancarella, Davide Gerosa
https://arxiv.org/abs/2510.11861

Impact of facility timing and coordination for next-generation gravitational-wave detectors
While the Einstein Telescope and Cosmic Explorer proposals for next-generation, ground-based detectors promise vastly improved sensitivities to gravitational-wave signals, only joint observations are expected to enable the full scientific potential of these facilities, making timing and coordination between the efforts crucial to avoid missed opportunities. This study investigates the impact of long-term delays on the scientific capabilities of next-generation detector networks. We use the Fish…

We’ve published new research from the EU co-funded project NGSOTI: “Learning from large-scale IPv4 blackhole: Behavioral analysis of SNMP traffic”.
Over a 12-month period (Nov 2024–Oct 2025), our network telescope captured ~634 million unsolicited SNMP queries from more than 153,000 unique IPv4 sources scanning an unused /18 block.
The origins of the traffic are globally distributed, with notable concentrations from Indonesia, China, the United States, Germany, Chile and others, …

Mass dependence of halo baryon fractions from the kinetic Sunyaev-Zeldovich effect
Finn A. Roper, Yan-Chuan Cai, John A. Peacock
https://arxiv.org/abs/2510.12553 https://…

Mass dependence of halo baryon fractions from the kinetic Sunyaev-Zeldovich effect
We detect the kinetic Sunyaev-Zeldovich imprint of peculiar motions of galaxy groups and clusters, using the photometric DESI Legacy Survey together with cosmic microwave background (CMB) maps from the Atacama Cosmology Telescope (ACT). We develop a comprehensive forward model based on the AbacusSummit cosmological simulations: mock galaxy group catalogues and synthetic kSZ maps are generated, together with a reconstructed peculiar velocity field that allows for photo-$z$ errors, redshift-space…

Medium-scale anisotropies measured by Telescope Array surface detectors
Jihyun Kim (on behalf of the Telescope Array Collaboration), Dmitri Ivanov (on behalf of the Telescope Array Collaboration), Kazumasa Kawata (on behalf of the Telescope Array Collaboration), Hiroyuki Sagawa (on behalf of the Telescope Array Collaboration), Gordon Thomson (on behalf of the Telescope Array Collaboration)

Medium-scale anisotropies measured by Telescope Array surface detectors
The Telescope Array (TA) experiment, the largest observatory for ultra-high energy cosmic rays in the Northern Hemisphere, has identified two medium-scale anisotropies: the TA Hotspot near the constellation Ursa Major and an excess in the direction of the Perseus-Pisces supercluster. Studying these medium-scale anisotropies may provide insights into the origins of ultra-high energy cosmic rays. This presentation will explore an oversampling analysis of TA surface detector data to evaluate these…

At the dawning of the seventeenth century, Kepler's optics applied to the telescope in the hands of Galileo left no room for argument: whatever the Truth might be, Aristotelian physics was demonstrably dead, and vilified Copernicus redeemed.
https://knowablemagazine.org/content/article/technology/2025/super-resolution-microscopes-reveal-new-details-cells

A smooth filament origin for distant prolate galaxies seen by JWST and HST: #DarkMatter in ways never before possible.

The simulation chain for the Terzina Cherenkov telescope on board the NUSES space mission
M. Abdullahi, R. Aloisio, F. Arneodo, S. Ashurov, U. Atalay, F. C. T. Barbato, R. Battiston, M. Bertaina, E. Bissaldi, D. Boncioli, L. Burmistrov, F. Cadoux, I. Cagnoli, E. Casilli, D. Cortis, A. Cummings, M. D'Arco, S. Davarpanah, I. De Mitri, G. De Robertis, A. Di Giovanni, A. Di Salvo, L. Di Venere, J. Eser, Y. Favre, S. Fogliacco, G. Fontanella, P. Fusco, S. Garbolino, F. Gargano, M. Gilib…

The simulation chain for the Terzina Cherenkov telescope on board the NUSES space mission
The Terzina telescope is designed to detect ultra-high energy cosmic rays (UHECRs) and Earth-skimming neutrinos from a 550 km low-Earth orbit (LEO) by observing Cherenkov light emitted by Extensive Air Showers (EAS) in the Earth's atmosphere pointing towards the telescope and in the field of view. In this contribution, a simulation chain for the Terzina telescope on board the NUSES mission will be presented. The chain encompasses all stages of the detection process, from event generation and EA…

🇺🇦 #NowPlaying on KEXP's #DriveTime
Emmeline feat. Eaves Wilder:
🎵 Telescope
#Emmeline #EavesWilder
https://emmelineemmelineemmeline.bandcamp.com/track/telescope-feat-eaves-wilder
https://open.spotify.com/track/6QRms8INZHPzImZNP5GVJx

Mapping the Stellar Kinematics in the Central 240 Parsecs of M87 with the James Webb Space Telescope
Refa M. Al-Amri, Jonelle L. Walsh, Emily R. Liepold, Chung-Pei Ma, Jenny E. Greene
https://arxiv.org/abs/2510.02439

Mapping the Stellar Kinematics in the Central 240 Parsecs of M87 with the James Webb Space Telescope
The supermassive black hole (SMBH) in the giant elliptical galaxy M87 is one of the most well-studied in the local universe, but the stellar- and gas-dynamical SMBH mass measurements disagree. As this galaxy is a key anchor for the upper end of the SMBH mass$-$host galaxy relations, we revisit the central $3''\times 3''$ ($\sim 240\times240$ pc) region of M87 with the Near Infrared Spectrograph (NIRSpec) integral field unit (IFU) on the James Webb Space Telescope (JWST). We implement several im…

Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT)
Nobuyuki Sakai, Saran Poshyachinda, Koichiro Sugiyama, Wiphu Rujopakarn, Boonrucksar Soonthornthum, Apichat Leckngam, Busaba Kramer, Phrudth Jaroenjittichai, Bannawit Pimpanuwat, Dan Singwong, Kitipoom Kanjana, Nikom Prasert, Songklod Punyawarin, Spiro Sarris, Teep Chairin, Kamorn Bandudej, Chalunthon Nuchur, Haseng Sani, Nattawit Chanwedchasart, Pathit Chatu…

Detection of OH maser emission in the 71-year periodic comet 12P/Pons-Brooks using the 40-m Thai National Radio Telescope (TNRT)
Although the optical cometary database is extensive, the radio database is limited. The 18-cm OH maser observations of comets allow us to determine (i) the production rate of OH ($Q_{\rm{OH}}$) and (ii) the water expansion velocity, for each comet. To reveal the physical properties of the periodic comet 12P/Pons-Brooks, we conducted the OH maser observations of the comet using the 40-m TNRT (Thai National Radio Telescope) on March 22nd, 27th and 29th, 2024 before the perihelion passage on April…

All eyes on #3I/ATLAS ☄️
Our Mars Express & ExoMars Trace Gas Orbiter will observe the comet around its closest approach to Mars on 3 October 2025, when 3I/ATLAS will be around 30 million km from the red planet.

ESA observations of interstellar comet 3I/ATLAS
The European Space Agency (ESA) reacted promptly to the discovery of comet 3I/ATLAS on 1 July 2025. Soon after they were alerted to its existence by automated detection systems, ESA astronomers began using ground-based telescopes in Hawaii, Chile, and Australia to monitor its progress.Since then, the comet has been observed by space telescopes close to Earth, including the NASA/ESA Hubble Space Telescope and the NASA/ESA/CSA James Webb Space Telescope.In the coming months, ESA will turn interp…

The Type II SN 2025pht in NGC 1637 - A Red Supergiant with Carbon-rich Circumstellar Dust as the First JWST Detection of a #Supernova Progenitor Star: https://iopscience.iop.org/article/10.3847/2041-8213/ae04de -> Webb Telescope unveils doomed star hidden in dust: https://news.northwestern.edu/stories/2025/10/webb-telescope-unveils-doomed-star-hidden-in-dust?fj=1 - new finding could help solve the mystery of the missing massive red supergiants.

Wavefront Error Recovery and Companion Identification with the James Webb Space Telescope
Matthew De Furio, Marie Ygouf, Alexandra Greenbaum, Gra\c{c}a Rocha, Michael Meyer, Charles Beichman, Jorge Llop-Sayson, Gael Roudier, Steph Sallum, Jarron Leisenring, Anand Sivaramakrishnan
https://arxiv.org/abs/2510.05308

Wavefront Error Recovery and Companion Identification with the James Webb Space Telescope
The James Webb Space Telescope is orders of magnitude more sensitive than any other facility across the near to mid-infrared wavelengths. Many approved programs take advantage of its highly stable point spread function (PSF) to directly detect faint companions using diverse high-contrast imaging (HCI) techniques. However, periodic re-phasing of the Optical Telescope Element (OTE) is required due to slow thermal drifts distorting to the primary mirror backplane along with stochastic tilt events …

Features in the Cosmic Ray Energy Spectrum Observed with Telescope Array Surface Detectors
Jihyun Kim (on behalf of the Telescope Array Collaboration), Dmitri Ivanov (on behalf of the Telescope Array Collaboration), Gordon Thomson (on behalf of the Telescope Array Collaboration)
https://arxiv.org/abs/2510.02740

Features in the Cosmic Ray Energy Spectrum Observed with Telescope Array Surface Detectors
Ultra-high energy cosmic rays (UHECRs) are extremely energetic charged particles that originate from outer space. The Telescope Array (TA) experiment, the largest UHECR observatory in the Northern Hemisphere, has provided high-precision measurements of the cosmic ray energy spectrum due to its stable operation and efficient data collection. These measurements have revealed three significant spectral features: the ankle, shoulder, and cutoff. Analyzing these features is crucial for understanding…

The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
Lo\"ic Albert (D\'epartement de Physique and Observatoire du Mont-M\'egantic, Universit\'e de Montr\'eal, Trottier Institute for Research on Exoplanets), Sabrina R. Poulsen (Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma), \'Erika Le Bourdais (D\'epartement de physique and Institut Trot…

The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
The MIRI Excesses Around Degenerates Survey is a Cycle 2 James Webb Space Telescope (JWST) Survey program designed to image nearby white dwarfs in the mid-IR with the MIRI imaging mode. Only a handful of white dwarfs have previously been observed beyond 8~\micron. This survey gathered observations for 56 white dwarfs within 25~pc at 10 and 15~\micron, probing each white dwarf for unresolved IR excesses, IR flux deficits indicative of collision induced absorption, or resolved substellar companio…

Argentina’s move to woo Trump has derailed South America’s largest radio telescope: #CART) in limbo, jeopardizing research into pulsars and other celestial objects.

Our solar system’s interstellar interloper, 3I/ATLAS,
showed strong ultraviolet emissions that are unmistakable telltales of hydroxyl gas (OH), a byproduct of water,
when astronomers imaged it with the with NASA’s Neil Gehrels Swift space telescope before it disappeared behind the Sun.
Their findings, detailed in a new studypublished in The Astrophysical Journal Letters, argue that the presence of all this OH indicates
the comet is ejecting water vapor at a torrentia…

LATIS Data Release: $\sim4200$ Spectra of $z \sim 2-3$ Galaxies, Redshifts, and IGM Tomography Maps
Andrew B. Newman, Gwen C. Rudie, Guillermo A. Blanc, Daniel D. Kelson, Nima Chartab, Enrico Congiu, Victoria P\'erez, Mahdi Qezlou, Simeon Bird, Brian C. Lemaux, Olga Cucciati
https://arxiv.org/abs/2510.08815

LATIS Data Release: $\sim4200$ Spectra of $z \sim 2-3$ Galaxies, Redshifts, and IGM Tomography Maps
We present the data release of the Ly$α$ Tomography IMACS Survey (LATIS), one of the largest optical spectroscopic surveys of faint high-redshift galaxies. The survey provides 7408 optical spectra of candidate $z \sim 2-3$ galaxies and QSOs in the Canada-France-Hawaii Telescope Legacy Survey D1, D2 (COSMOS), and D4 fields. The $R \sim 1000$ spectra were obtained using the IMACS spectrograph at the Magellan Baade telescope, with typical integrations of 12 hr. From these spectra, we measured 557…

Ly{\alpha} Intensity Mapping in HETDEX: Galaxy-Ly{\alpha} Intensity Cross-Power Spectrum
Maja Lujan Niemeyer, Eiichiro Komatsu, Jos\'e Luis Bernal, Chris Byrohl, Robin Ciardullo, Olivia Curtis, Daniel J. Farrow, Steven L. Finkelstein, Karl Gebhardt, Caryl Gronwall, Gary J. Hill, Matt J. Jarvis, Donghui Jeong, Erin Mentuch Cooper, Deeshani Mitra, Shiro Mukae, Julian B. Mu\~noz, Masami Ouchi, Shun Saito, Donald P. Schneider, Lutz Wisotzki

Lyα Intensity Mapping in HETDEX: Galaxy-Lyα Intensity Cross-Power Spectrum
We present a measurement of the Lyman-$α$ (Ly$α$) intensity mapping power spectrum from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). We measure the cross-power spectrum of the Ly$α$ intensity and Ly$α$-emitting galaxies (LAEs) in a redshift range of $1.9 < z < 3.5$. We calculate the intensity from HETDEX spectra that do not contain any detected LAEs above a signal-to-noise ratio of $5.5$. To produce a power spectrum model and its covariance matrix, we simulate the data using …

Simultaneously NASA and ESA have published new spacecraft images of #3IATLAS, https://science.nasa.gov/blogs/3iatlas/2025/12/04/nasas-hubble-space-telescope-revisits-interstellar-comet/ from the Hubble Space Telescope on 30 November (just the inner coma with a central condensation) and https://www.esa.int/ESA_Multimedia/Images/2025/12/Comet_3I_ATLAS_shows_activity_in_Juice_navigation_camera_teaser from Juice's NavCam on 2 November with an early sighting of the plasma tail - more contributions to understanding the behavior of the interstellar visitor.

Event Horizon Telescope Pattern Speeds in the Visibility Domain
Nicholas S. Conroy, Michi Baub\"ock, Vedant Dhruv, Daeyoung Lee, Chi-kwan Chan, Abhishek V. Joshi, Ben Prather, Charles F. Gammie
https://arxiv.org/abs/2510.08848

Event Horizon Telescope Pattern Speeds in the Visibility Domain
The Event Horizon Telescope is preparing to produce time sequences of black hole images, or movies. In anticipation, we developed an autocorrelation technique to measure apparent rotational motion using the image-domain pattern speed $Ω_p$. Here, we extend this technique to the visibility domain and introduce the visibility amplitude pattern speed $Ω_{\mathrm{VA}}$. We show that in the Illinois v3 library of EHT source models, $Ω_{\mathrm{VA}}$ depends on the source inclination, black hole m…

NASA’s #SPHEREx Observatory Completes First Cosmic Map Like No Other: https://www.jpl.nasa.gov/news/nasas-spherex-observatory-completes-first-cosmic-map-like-no-other/ - the space telescope has completed its first infrared map of the entire sky in 102 colors.

The double neutron star PSR J1946 2052 I. Masses and tests of general relativity
Lingqi Meng, Paulo C. C. Freire, Kevin Stovall, Norbert Wex, Xueli Miao, Weiwei Zhu, Michael Kramer, James M. Cordes, Huanchen Hu, Jinchen Jiang, Emilie Parent, Lijing Shao, Ingrid H. Stairs, Mengyao Xue, Adam Brazier, Fernando Camilo, David J. Champion, Shami Chatterjee, Fronefield Crawford, Ziyao Fang, Qiuyang Fu, Yanjun Guo, Jason W. T. Hessels, Maura MacLaughlin, Chenchen Miao, Jiarui Niu, Ziwei Wu, Ju…

The double neutron star PSR J1946+2052 I. Masses and tests of general relativity
We conducted high-precision timing of PSR J1946+2052 to determine the masses of the two neutron stars in the system, test general relativity (GR) and assessed the system's potential for future measurement of the moment of inertia of the pulsar. We analysed seven years of timing data from the Arecibo 305-m radio telescope, the Green Bank Telescope (GBT), and the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The data processing accounted for dispersion measure variations and relat…

Observations of a Faint Nonthermal Onset before a GOES C-class Flare
Nat\'alia Bajnokov\'a, Iain G. Hannah, Hannah Collier, Stephen M. White, Lindsay Glesener, Reed B. Masek, Marianne S. Peterson, S\"am Krucker, Hugh S. Hudson
https://arxiv.org/abs/2510.02052

Observations of a Faint Nonthermal Onset before a GOES C-class Flare
We present analysis of a GOES C1-class flare from 2022 September 6, which was jointly observed as occulted by Nuclear Spectroscopic Telescope ARray (NuSTAR) and on-disk by Spectrometer/Telescope for Imaging X-rays (STIX). NuSTAR observed faint coronal nonthermal emission as well as plasma heating > 10 MK, starting 7 minutes prior to the flare. This onset emission implies that during this time, there is a continuous electron acceleration in the corona which could also be responsible for the obse…

Hubble reveals complex multi-scale structure in the edge-on protoplanetary disk IRAS 23077 6707
Kristina Monsch, Joshua B. Lovell, Karl R. Stapelfeldt, Sean M. Andrews, Ammar Bayyari, Alice S. Booth, Adolfo S. Carvalho, John H. Debes, Jeremy J. Drake, Joshua W. J. Earley, Cecilia Garraffo, Garrett K. Keating, Michael L. Sitko, David J. Wilner
https://

Hubble reveals complex multi-scale structure in the edge-on protoplanetary disk IRAS 23077+6707
We present high-resolution (<0.1") Hubble Space Telescope (HST)/Wide Field Camera 3 (WFC3) imaging of the near edge-on (i~80 deg) protoplanetary disk IRAS 23077+6707 ("Dracula's Chivito") obtained across six broadband filters spanning 0.4-1.6 microns. These observations unveil the scattered light from this unusually large disk (~14", or ~4200 au at 300 pc) in remarkable detail, revealing a rich tapestry of substructure, including brightness asymmetries and signatures of dynamical activity. Exte…

Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
Miku Tsujii, Tomonaga Tanaka, Alessandro Fasano, Ricardo G\'enova-Santos, Shunsuke Honda, Yonggil Jo, Keisuke Kataoka, Chiko Otani, Mike Peel, Junya Suzuki, Osamu Tajima, Eunil Won, Makoto Hattori
https://arxiv.org/abs/2509.22071

Optimization procedure of the baffle of the GroundBIRD Telescope to mitigate stray light
We presented the optimization procedures of the baffle mounted on the GroundBIRD telescope for measuring the polarization of the Cosmic Microwave Background~(CMB). The telescope employs dual mirror reflective telescopes installed in a cryostat. The primary objectives were to minimize stray light contamination, maintain the integrity of the main beam, and ensure that thermal loading from the baffle remains significantly below that from the atmosphere. Using quasi-optical simulations, we have opt…

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121 b: #exoplanet WASP-121b.

Wide Area VISTA Extragalactic Survey (WAVES): Selection of targets for the Wide survey using decision-tree classification
G. Kaur, M. Bilicki, S. Bellstedt, E. Tempel, W. A. Hellwing, I. Baldry, B. Bandi, S. Barsanti, S. Driver, N. Guerra-Varas, B. Holwerda, C. Lagos, J. Loveday, A. Robotham
https://arxiv.org/abs/2510.11132

Wide Area VISTA Extragalactic Survey (WAVES): Selection of targets for the Wide survey using decision-tree classification
The Wide-Area VISTA Extragalactic Survey (WAVES) on the 4-metre Multi-Object Spectroscopic Telescope (4MOST) includes two flux-limited subsurveys with very high (95\%) completeness requirements: Wide over $\sim\!1200$ deg$^2$ and Deep over $\sim\!65$ deg$^2$. Both are $Z$-band selected, respectively as $Z<21.1$ and $Z<21.25$ mag, and additionally redshift-limited, while the true redshifts are not known a priori but will be only measured by 4MOST. Here, we present a classification-based method t…

VHE $\gamma$-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO
Project, , Abe, Abe, Abhishek, Acero, Aguasca-Cabot, Agudo, Alispach, Ambrosino, Ambrosino, Antonelli, Aramo, Arbet-Engels, Arcaro, Arnesen, Asano, Aubert, Baktash, Balbo, Bamba, Larriva, de Almeida, Barrio, Jim\'enez, Batkovic, Baxter, Gonz\'alez, Bernardini, Bernete, Berti, Bezshyiko, Bigongiari, Bissaldi, Blanch, Bonnoli, Bordas, Borkowski, Brunelli, Bulgarelli, Bunse…

VHE $γ$-ray observations of bright BL Lacs with the Large-Sized Telescope prototype (LST-1) of the CTAO
Cherenkov Telescope Array Observatory (CTAO) is the next-generation ground-based gamma-ray observatory operating in the energy range from 20 GeV up to 300 TeV, with two sites in La Palma (Spain) and Paranal (Chile). It will consist of telescopes of three sizes, covering different parts of the large energy range. We report on the performance of Large-Sized Telescope prototype (LST-1) in the detection and characterization of extragalactic gamma-ray sources, with a focus on the reconstructed gamma…

Variation of the disk thickness across ice bands: A method to determine ice abundances in highly inclined protoplanetary disks
Laurine Martinien, Gaspard Duch\^ene, Fran\c{c}ois M\'enard, Karl R. Stapelfeldt, Ryo Tazaki, Jennifer B. Bergner, Emmanuel Dartois, Jennifer A. Noble, William Thompson
https://arxiv.org/abs/2510.11359

Variation of the disk thickness across ice bands: A method to determine ice abundances in highly inclined protoplanetary disks
The James Webb Space Telescope provides unprecedented information to study ices in protoplanetary disks. However, the saturation of ice bands in highly inclined disks hinders the measurement of ice abundances using classical spectroscopy. This is unfortunate as the presence and more importantly abundance of ices plays a key role in, e.g., the evolution of dust (because it modifies the sticking properties) and the composition of planetesimals and exoplanetary atmospheres. To overcome this issue …

Enhancing the development of Cherenkov Telescope Array control software with Large Language Models
Dmitriy Kostunin, Elisa Jones, Vladimir Sotnikov, Valery Sotnikov, Sergo Golovachev, Alexandre Strube
https://arxiv.org/abs/2510.01299

Enhancing the development of Cherenkov Telescope Array control software with Large Language Models
We develop AI agents based on instruction-finetuned large language models (LLMs) to assist in the engineering and operation of the Cherenkov Telescope Array Observatory (CTAO) Control and Data Acquisition Software (ACADA). These agents align with project-specific documentation and codebases, understand contextual information, interact with external APIs, and communicate with users in natural language. We present our progress in integrating these features into CTAO pipelines for operations and o…

Early massive galaxy formation in the core of a galaxy protocluster 650 million years after the Big Bang
Yoshinobu Fudamoto, Yurina Nakazato, Daniel Ceverino, Luis Colina, Takuya Hashimoto, Akio K. Inoue, Yoichi Tamura, Naoki Yoshida, Yongda Zhu, Yuma Sugahara, Santiago Arribas, Javier 'Arvarez-M'arquez, Tom Bakx, Carmen Blanco Prieto, Luca Costantin, Alejandro Crespo G'omez, Masato Hagimoto, Takeshi Hashigaya, Hiroshi Matsuo, Rui Marques-Chaves, Ken Mawatari, Ikki Mitsuhas…

Early massive galaxy formation in the core of a galaxy protocluster 650 million years after the Big Bang
Rest-frame optical observations with the James Webb Space Telescope (JWST) have uncovered a population of massive galaxies, exceeding $10^{10}$ solar masses, present less than a billion years after the Big Bang. The large stellar masses of these galaxies require an efficient conversion of baryons into stars, which may exceed theoretical expectations. However, the formation process of massive galaxies so early in the Universe's history is perplexing, as observations provide limited information t…

A broadband study of FRB20240114A with the Effelsberg 100-m radio telescope
P. Limaye, L. G. Spitler, N. Manaswini, J. Ben\'a\v{c}ek, F. Eppel, M. Kadler, L. Nicotera, J. Wongphechauxsorn
https://arxiv.org/abs/2510.08367

A broadband study of FRB20240114A with the Effelsberg 100-m radio telescope
We present Effelsberg 100-m telescope observations of the hyperactive repeating fast radio burst source FRB 20240110A, discovered by CHIME/FRB in January 2024. Using the Ultra BroadBand (UBB) receiver, spanning 1.3-6.0 GHz, we detected over 700 unique bursts across four observing epochs. A comprehensive analysis of their temporal and spectral properties reveals four distinct spectro-temporal morphologies, including simple, complex and frequency-drifting structures. No bursts were detected acros…

Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes
Mehdi Rezaei, Supriya Pan, Weiqiang Yang, David F. Mota
https://arxiv.org/abs/2510.09766

Is Dark Energy Changing? Probing the Universe's Expansion with present and future astronomical probes
This study explores the possibility of a time-varying dark energy (DE) equation of state (EoS) deviating from -1. We employ a comprehensive dataset of usual astronomical probes (Type Ia supernovae, baryon acoustic oscillations, Big Bang nucleosynthesis, Hubble data, and Planck 2018 CMB) alongside future mock gravitational wave (GW) distance measurements from the Einstein Telescope. We utilize the Pad'e approximation, a versatile framework encompassing well-known DE models like constant EoS, Che…

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B
C. Moutou, P. Petit, P. Charpentier, P. Cristofari, C. Baruteau, P. Th\'ebault, L. Arnold, E. Artigau, A. Carmona, N. J. Cook, F. Debras, X. Delfosse, J. -F. Donati, L. Malo, M. Ould-Elhkim
https://arxiv.org/abs/251…

Characterizing planetary systems with SPIRou: questions about the magnetic cycle of 55 Cnc A and two new planets around B
One of the first exoplanet hosts discovered thirty years ago, the star 55 Cnc has been constantly observed ever since. It is now known to host at least five planets with orbital periods ranging from 17 hours to 15 years. It is also one of the most extreme metal rich stars in the neighbourhood and it has a low-mass secondary star. In this article, we present data obtained at the Canada-France-Hawai'i Telescope with the SPIRou spectropolarimeter on both components of the 55 Cnc stellar system. We…

Discovery of an Accretion Burst in a Free-Floating Planetary-Mass Object
V. Almendros-Abad, A. Scholz, B. Damian, R. Jayawardhana, A. Bayo, L. Flagg, K. Muzic, A. Natta, P. Pinilla, L. Testi
https://arxiv.org/abs/2510.01747

Discovery of an Accretion Burst in a Free-Floating Planetary-Mass Object
We report the discovery of a long-lasting burst of disk accretion in Cha J11070768-7626326 (Cha 1107-7626), a young, isolated, 5-10 M$_{\mathrm{Jupiter}}$ object. In spectra taken with XSHOOTER at ESO's Very Large Telescope as well as NIRSPEC and MIRI on the James Webb Space Telescope, the object transitions from quiescence in April-May 2025 to a strongly enhanced accretion phase in June-August 2025. The line flux changes correspond to a 6-8-fold increase in the mass accretion rate, reaching $1…

The #GiantMagellanTelescope international consortium welcomed Academia Sinica Institute of Astronomy and Astrophysics, or ASIAA, as its newest member, the consortium announced Tuesday: https://astro.arizona.edu/news/giant-magellan-telescope-brings-new-partner-fold

PDRs4All XVII: Formation and excitation of HD in photodissociation regions. Application to the Orion Bar
Marion Zannese, Jacques Le Bourlot, Evelyne Roueff, Emeric Bron, Franck Le Petit, Dries Van De Putte, Maryvonne Gerin, Naslim Neelamkodan, Javier R. Goicoechea, John Black, Ryan Chown, Ameek Sidhu, Emilie Habart, Els Peeters, Olivier Bern\'e
https://

PDRs4All XVII: Formation and excitation of HD in photodissociation regions. Application to the Orion Bar
The James Webb Space Telescope enabled the first detection of several rovibrational emission lines of HD in the Orion Bar, a prototypical photodissociation region. This provides an incentive to examine the physics of HD in dense and strong PDRs. Using the latest data available on HD excitation by collisional, radiative and chemical processes, our goal is to unveil HD formation and excitation processes in PDRs by comparing our state-of-the-art PDR model with observations made in the Orion Bar an…

First Light for the GRAVITY Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer
GRAVITY Collaboration
https://arxiv.org/abs/2509.21431 https:/…

First Light for the GRAVITY+ Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer
GRAVITY+ improves by orders of magnitude the sensitivity, sky-coverage and contrast of the Very Large Telescope Interferometer (VLTI). A central part of this project is the development of Gravity Plus Adaptive Optics (GPAO), a dedicated high-order and laser-guide star Adaptive Optics (AO) system for VLTI. GPAO consists of four state-of-the-art AO systems equipping all 8m-class Unit Telescopes (UTs) for the wavefront correction of the VLTI instruments. It offers both visible and infrared Natural…

Identification of Gamma Ray Pulsar Candidates in the \emph{Fermi}-LAT 4FGL-DR4 Unassociated Sources Using Supervised Machine Learning
A. Pathania, K. K. Singh, S. K. Singh, A. Tolamatti, B. B. Singh, K. K. Yadav
https://arxiv.org/abs/2510.08654

Identification of Gamma Ray Pulsar Candidates in the \emph{Fermi}-LAT 4FGL-DR4 Unassociated Sources Using Supervised Machine Learning
The Large Area Telescope (LAT) on board the \emph{Fermi} Gamma-ray Space Telescope has been continuously providing good quality survey data of the entire sky in the high energy range from 30 MeV to 500 GeV and above since August 2008. A succession of gamma-ray source catalogs is published after a comprehensive analysis of the \emph{Fermi}--LAT data. The most recent release of data in the fourth \emph{Fermi}--LAT catalog of gamma-ray sources (4FGL-DR4), based on the first 14 years of obser…

JWST Observations of SN 2024ggi II: NIRSpec Spectroscopy and CO Modeling at 285 and 385 Days Past the Explosion
T. Mera, C. Ashall, P. Hoeflich, K. Medler, M. Shahbandeh, C. R. Burns, E. Baron, J. M. DerKacy, E. Fereidouni, C. M. Pfeffer, S. Shiber, P. J. Brown, A. Burrow, D. . A. Coulter, M. Engesser, L. Ferrari, G. Folatelli, O. Fox, L. Galbany, M. Guolo, J. T. Hinkle, W. B. Hoogendam, E. Y. Hsiao, M E. Huber, T. de Jaeger, D. O. Jones, S. Kumar, J. Lu, P. A. Mazzali, N. Morrell, M. …

JWST Observations of SN 2024ggi II: NIRSpec Spectroscopy and CO Modeling at 285 and 385 Days Past the Explosion
We present James Webb Space Telescope (JWST) NIRSpec 1.7--5.5 micron observations of SN~2024ggi at +285.51 and +385.27 days post-explosion. The late-time nebular spectra are dominated by emission lines from various ionization states of H, Ca, Ar, C, Mg, Ni, Co, and Fe. We also detect strong CO emission in both the first overtone and fundamental vibrational bands. Most atomic features exhibit asymmetric line profiles, indicating an aspherical explosion. Using observed fluxes combined with non-LT…

Understanding Exoplanet Habitability: A Bayesian ML Framework for Predicting Atmospheric Absorption Spectra
Vasuda Trehan, Kevin H. Knuth, M. J. Way
https://arxiv.org/abs/2510.08766

Understanding Exoplanet Habitability: A Bayesian ML Framework for Predicting Atmospheric Absorption Spectra
The evolution of space technology in recent years, fueled by advancements in computing such as Artificial Intelligence (AI) and machine learning (ML), has profoundly transformed our capacity to explore the cosmos. Missions like the James Webb Space Telescope (JWST) have made information about distant objects more easily accessible, resulting in extensive amounts of valuable data. As part of this work-in-progress study, we are working to create an atmospheric absorption spectrum prediction model…

ImageMM - Joint Multi-frame Image Restoration and Super-resolution: #ImageProcessing

Black Holes in the Shadow: The Missing High-Ionization Lines in the Earliest JWST AGNs
Greta Zucchi, Xihan Ji, Piero Madau, Roberto Maiolino, Ignas Joudzbalis, Francesco D'Eugenio, Sophia Geris, Yuki Isobe
https://arxiv.org/abs/2510.10772

Black Holes in the Shadow: The Missing High-Ionization Lines in the Earliest JWST AGNs
Observations with the James Webb Space Telescope (JWST) have uncovered a substantial population of high-redshift, broad-line active galactic nuclei (AGNs), whose properties challenge standard models of black hole growth and AGN emission. We analyze a spectroscopic sample of 34 Type 1 AGNs from the JWST Advanced Deep Survey (JADES) survey, spanning redshifts 1.7 < z < 9, to constrain the physical nature of the accretion flows powering these sources with broad-line diagnostics statistically for t…

Winding Motion of Spirals in a Gravitationally Unstable #Protoplanetary Disk: https://arxiv.org/abs/2509.19761 -> Winding Motion of Planet-Forming Spirals Captured on Video for the First Time: https://alma-telescope.jp/en/news/press/vimage-202509.html -> Spirals in Planet-Forming Disk Caught Twisting for the First Time with ALMA: https://www.almaobservatory.org/en/press-releases/spirals-in-planet-forming-disk-caught-twisting-for-the-first-time-with-alma/

JWST imaging of omega Centauri: II. Evidence for a split white dwarf cooling sequence in the near-infrared
M. Scalco (Indiana University), M. Salaris (Liverpool John Moores University, INAF-OAAb), L. R. Bedin (INAF-OAPD), S. Blouin (University of Victoria), E. Vesperini (Indiana University), P. Bergeron (University of Montreal), M. Libralato (INAF-OAPD), M. Griggio (STScI), A. Burgasser (UniCA SanDiego), D. Nardiello (UniPD, INAF-OAPD), A. Bellini (STScI), J. Anderson (STScI), R. Geras…

JWST imaging of omega Centauri: II. Evidence for a split white dwarf cooling sequence in the near-infrared
We present a detailed analysis of the white dwarf cooling sequence (WD CS) in omega Centauri based on combined Hubble Space Telescope (HST) and JWST observations. Our analysis confirms the previously reported split - based on HST observations in ultraviolet filters - in the upper part of the WD CS, consistent with the presence of two distinct WD populations, and extends it to a significantly fainter and cooler limit (down to ~8000 K), corresponding to cooling ages of about 1 Gyr. We used artifi…

The Programmable Liquid-crystal Active Coronagraphic Imager for the 4-m DAG telescope (PLACID) instrument - Discovery Space and Status: #Exoplanet Imaging with PLACID’s LCD Technology: https://www.europlanet.org/epsc-dps2025-bringing-the-digital-revolution-to-direct-exoplanet-imaging-with-placids-lcd-technology/

The Green Bank Ammonia Survey: Data Release 2
Jaime E. Pineda, Rachel K. Friesen, Erik Rosolowsky, Ana Chac\'on-Tanarro, Michael Chun-Yuan Chen, James Di Francesco, Helen Kirk, Anna Punanova, Youngmin Seo, Yancy Shirley, Adam Ginsburg, Stella S. R. Offner, Ayush Pandhi, Ayushi Singh, Feiyu Quan, H\'ector G. Arce, Paola Caselli, Spandan Choudhury, Alyssa A. Goodman, Fabian Heitsch, Peter G. Martin, Christopher D. Matzner, Philip C. Myers, Elena Redaelli, Samantha Scibelli

The Green Bank Ammonia Survey: Data Release 2
We present an overview of the final data release (DR2) from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green Bank Telescope to map all Gould Belt star-forming regions with $A_\mathrm{V} \gtrsim 7$~mag visible from the northern hemisphere in emission from NH$_3$ and other key molecular tracers. This final release includes the data for all the regions observed: Heiles Cloud 2 and B18 in Taurus; Barnard 1, Barnard 1-E, IC348, NGC 1333, L1448, L1451, and Per7/34 in Perseus; …

Dark matter and fundamental physics with the Cherenkov Telescope Array Observatory
Francesco Schiavone (Bari Univ., INFN Bari)
https://arxiv.org/abs/2509.24523 https://

Dark matter and fundamental physics with the Cherenkov Telescope Array Observatory
The Cherenkov Telescope Array Observatory (CTAO) will be the next-generation major ground-based gamma-ray observatory. It will be made up of two large arrays of imaging atmospheric Cherenkov telescopes (IACTs), with one site in the Northern hemisphere (La Palma, Canary Islands) and one in the Southern (Paranal, Chile). CTAO aims to offer great improvement in energetic and angular resolution with respect to current IACT systems, spanning a photon energy range from 20 GeV to 300 TeV, as well as a…

A Carbon-rich Disk Surrounding a Planetary-mass Companion: #disc offers insight into how the moons of solar system gas giants like Jupiter might have formed.

AMIGO: a Data-Driven Calibration of the JWST Interferometer
Louis Desdoigts, Benjamin Pope, Max Charles, Peter Tuthill, Dori Blakely, Doug Johnstone, Shrishmoy Ray, Anand Sivaramakrishnan, Jens Kammerer, Deepashri Thatte, Rachel Cooper
https://arxiv.org/abs/2510.09806

AMIGO: a Data-Driven Calibration of the JWST Interferometer
The James Webb Space Telescope (JWST) hosts a non-redundant Aperture Masking Interferometer (AMI) in its Near Infrared Imager and Slitless Spectrograph (NIRISS) instrument, providing the only dedicated interferometric facility aboard - magnitudes more precise than any interferometric experiment previously flown. However, the performance of AMI (and other high resolution approaches such as kernel phase) in recovery of structure at high contrasts has not met design expectations. A major contribut…

Planetary Nebula Evolution for Single Stellar Models. The Formation of Neutral Spikes
Guillermo Garcia-Segura, Arturo Manchado, Jesus A. Toala, Martin A. Guerrero, Alberto J. Castro-Tirado
https://arxiv.org/abs/2510.08721

Planetary Nebula Evolution for Single Stellar Models. The Formation of Neutral Spikes
Two-dimensional hydrodynamical simulations are presented from the formation up to the late evolution of planetary nebula, for 6 different stellar models from 1 to 5 Mo. The hydrodynamical models use stellar evolution calculations as inner boundary conditions and updated values for the number of ionizing photons. Special emphasis is placed on the formation of neutral spikes, as recently observed by the James Webb Space Telescope. The results indicate that neutral spikes can be detected either at…

Faint galaxies in the Zone of Avoidance revealed by JWST/NIRCam
J. L. Nilo-Castell\'on, M. V. Alonso, L. Baravalle, C. Villalon, C. N. A. Willmer, C. Valotto, M. Soto, D. Minniti, M. A. Sgr\'o, I. V. Daza-Perilla, H. Cuevas Larenas, A. Ramirez, J. Alonso-Garc\'ia, P. Marchant Cort\'es, F. Milla Castro
https://arxiv.org/abs/…

Faint galaxies in the Zone of Avoidance revealed by JWST/NIRCam
The Zone of Avoidance (ZoA) remains one of the last frontiers in constructing a comprehensive three-dimensional map of the Universe. Galactic extinction, stellar crowding, and confusion noise have historically limited the detection of background galaxies in these regions, with implications for large-scale structure and cosmological measurements. We assess the capability of the James Webb Space Telescope (JWST) Near Infrared Camera (NIRCam) to detect extragalactic sources in a heavily contaminat…

Image reconstruction with the JWST Interferometer
Max Charles, Louis Desdoigts, Benjamin Pope, Peter Tuthill, Dori Blakely, Doug Johnstone, Shrishmoy Ray, K. E. Saavik Ford, Barry McKernan, Anand Sivaramakrishnan
https://arxiv.org/abs/2510.10924

Image reconstruction with the JWST Interferometer
Flying on board the James Webb Space Telescope (JWST) above Earth's turbulent atmosphere, the Aperture Masking Interferometer (AMI) on the NIRISS instrument is the highest-resolution infrared interferometer ever placed in space. However, its performance was found to be limited by non-linear detector systematics, particularly charge migration - or the Brighter-Fatter Effect. Conventional interferometric Fourier observables are degraded by non-linear transformations in the image plane, with the c…

Horizon-scale variability of M87* from 2017--2021 EHT observations
The Event Horizon Telescope Collaboration
https://arxiv.org/abs/2509.24593 https://arxiv…

Horizon-scale variability of M87* from 2017--2021 EHT observations
We report three epochs of polarized images of M87* at 230\,GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 observations is significantly improved through the addition of two new EHT stations: the 12\,m Kitt Peak Telescope and the Northern Extended Millimetre Array (NOEMA). All observations result in images dominated by a bright, asymmetric ring with a persistent diameter of $43.9\pm 0.6\,\muas$, consistent with expectations …

First the nucleus of #comet SWAN split - https://skyweek.wordpress.com/2025/11/02/allgemeines-live-blog-ab-dem-2-november-2025/#Nov06 ("Der Kern des Kometen C/2025 R2 (SWAN) ist zerbrochen ...") - and now C/2025 K1 (ATLAS) has suffered the same fate: a 2-meter-telescope image from https://www.astronomerstelegram.org/?read=17487 ("Multiple Fragmentation Observed"), also https://groups.io/g/comets-ml/topic/116216567 (several amateur observations) and https://www.astronomerstelegram.org/?read=17488 (Hubble detections of more fragments, sadly no pictures included).

Resolving stellar populations, star formation, and ISM conditions with JWST in a large spiral galaxy at z $\sim$ 2
Eleonora Parlanti, Giulia Tozzi Natascha M. F\"orster Schreiber, Claudia Pulsoni, Letizia Scaloni, Stavros Pastras, Pascal Oesch, Capucine Barfety, Francesco Belfiore, Jianhang Chen, Giovanni Cresci, Ric Davies, Frank Eisenhauer, Juan M. Espejo Salcedo, Reinhard Genzel, Rodrigo Herrera-Camus, Jean-Baptiste Jolly. Lilian L. Lee, Minju M. Lee, Daizhong Liu, Dieter Lutz,…

Resolving stellar populations, star formation, and ISM conditions with JWST in a large spiral galaxy at z $\sim$ 2
Cosmic noon represents the prime epoch of galaxy assembly, and a sweet spot for observations with the James Webb Telescope (JWST) and ground-based near-IR integral-field unit (IFU) spectrographs. This work analyses JWST NIRSpec Micro Shutter Array (MSA), NIRCam Wide Field Slitless Spectroscopy (WFSS) of K20-ID7, a large spiral, star-forming (SF) galaxy at z=2.2, with evidence for radial gas inflows. By exploiting the synergy with ground-based IFU ERIS observations, we conduct a comprehensive an…

The Milky Way Imaging Scroll Painting Survey - Data Release 1: #MWISP survey was conducted using the PMO 13.7 m telescope at a spatial resolution of approximately 50" and a velocity resolution of 0.16 km/s at 115 GHz. DR1 fully covered 2310 square degrees within the Galactic longitude (l) and latitude (b) range of 9.75 deg =< l=< 229.75 deg and |b| =< 5.25 deg."

A transmission hologram for slitless spectrophotometry on a convergent telescope beam. Optimisation and characterization
Sylvie Dagoret-Campagne, Marc Moniez, Jeremy Neveu, Aurelien Blot, Pierre Antilogus, Claire Juramy, Leurent Le Guillou, Philippe Repain, Eduardo Sepulveda, Christophe Michel, Francois Colas
https://arxiv.org/abs/2509.255…

A transmission hologram for slitless spectrophotometry on a convergent telescope beam. Optimisation and characterization
This article details the optimisation and the characterisation of the hologram described in a companion paper published in 2021, which showed the superiority of a holographic optical element over a periodic grating as a disperser installed in the path of a converging beam on an on-axis detector (unbent spectrograph) for slitless spectroscopy. In this article, we describe in detail the development and optimisation of the final optical holographic element installed on the spectrograph of the auxi…

Discovery of Changing-Look behavior in AGN NGC 3822: A long-term multiwavelength study
Narendranath Layek, Prantik Nandi, Sachindra Naik, Birendra Chhotaray, Arghajit Jana, Priyadarshee P. Dash, Neeraj Kumari, C. S. Stalin, Srikanth Bandari, S. Muneer
https://arxiv.org/abs/2510.05599

Discovery of Changing-Look behavior in AGN NGC 3822: A long-term multiwavelength study
We present a comprehensive long-term multi-wavelength study of the active galactic nucleus (AGN) NGC 3822, based on 17 years (2008 to 2025) of X-ray, ultraviolet (UV), and optical observations.The dataset includes observations from Swift, XMM-Newton, and NuSTAR, the Very Large Telescope, and the Himalayan Chandra Telescope. Our multiwavelength light curve analysis reveals flux variations across X-ray to optical/UV bands, with an increased variability amplitude at shorter wavelengths. X-ray spec…

1000–10,000 M⊙ #PrimordialStars Created the Nitrogen Excess in GS 3073 at z = 5.55: https://iopscience.iop.org/article/10.3847/2041-8213/ae1a63 -> Astronomers find first direct evidence of “Monster Stars” from the cosmic dawn: https://www.port.ac.uk/news-events-and-blogs/news/astronomers-find-first-direct-evidence-of-monster-stars-from-the-cosmic-dawn - using the James Webb Space Telescope, a team of international researchers have discovered chemical fingerprints of gigantic primordial stars that were among the first to form after the Big Bang.

Environmental Regulation of Dust and Star Formation Unveiled by Subaru Dual Narrow-band Imaging: Degree-scale Balmer Decrement Mapping across a z = 0.9 Supercluster
Zhaoran Liu, Tadayuki Kodama, Brian C. Lemaux, Mariko Kubo, Jose Manuel P\'erez-Mart\'inez, Yusei Koyama, Ichi Tanaka, Kazuki Daikuhara, Roy R. Gal, Denise Hung, Masahiro Konishi, Kosuke Kushibiki, Ronaldo Laishram, Lori M. Lubin, Kentaro Motohara, Hidenori Takahashi

Environmental Regulation of Dust and Star Formation Unveiled by Subaru Dual Narrow-band Imaging: Degree-scale Balmer Decrement Mapping across a z = 0.9 Supercluster
We present results from a dual narrow-band imaging survey targeting the CL1604 supercluster at z = 0.9 using the Subaru Telescope. By combining the NB921 filter on HSC and the NB1244 filter on SWIMS, we can detect redshifted H$α$ and H$β$ emission lines from the supercluster. This unique technique allows us to measure both star formation rates and dust extinction for a sample of 94 emission-line galaxies across the supercluster. We find that dust extinction, estimated from the Balmer decremen…

Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
Jonathan Carney, Igor Andreoni, Brendan O'Connor, James Freeburn, Hannah Skobe, Lewi Westcott, Malte Busmann, Antonella Palmese, Xander J. Hall, Ramandeep Gill, Paz Beniamini, Eric R. Coughlin, Charles D. Kilpatrick, Akash Anumarlapudi, Nicholas M. Law, Hank Corbett, Tomas Ahumada, Ping Chen, Christopher Conselice, Guillermo D…

Optical/infrared observations of the extraordinary GRB 250702B: a highly obscured afterglow in a massive galaxy consistent with multiple possible progenitors
GRB 250702B was the longest gamma-ray burst ever observed, with a duration that challenges standard collapsar models and suggests an exotic progenitor. We collected a rich set of optical and infrared follow-up observations of its rapidly fading afterglow using a suite of telescopes including the W. M. Keck Observatory, the Gemini telescopes, the Magellan Baade Telescope, the Victor M. Blanco 4-meter telescope, and the Fraunhofer Telescope at Wendelstein Observatory. Our analysis reveals that th…

The evolution of CH in Planck Galactic Cold Clumps
Gan Luo, Arshia M. Jacob, Marco Padovani, Daniele Galli, Ana L\'opez-Sepulcre, Ningyu Tang, Di Li, Jing Zhou, Pei Zuo
https://arxiv.org/abs/2510.11146

The evolution of CH in Planck Galactic Cold Clumps
Methylidyne (CH) has long been considered a reliable tracer of molecular gas in the low-to-intermediate extinction range. Although extended CH 3.3 GHz emission is commonly observed in diffuse and translucent clouds, observations in cold, dense clumps are rare. In this work, we conducted high-sensitivity CH observations toward 27 PGCCs with the Arecibo 305m telescope. Toward each source, the CH data were analyzed in conjunction with $^{13}$CO (1--0), HINSA, and H$_2$ column densities. Our result…

Fe XVIII-XXIV K beta Inner-shell Absorption Lines in the X-ray Spectra of Neutron Star and Black Hole Binaries with XRISM
Masahiro Tsujimoto, Daiki Miura, Hiroya Yamaguchi, Ehud Behar, Chris Done, Maria Diaz Trigo, Chamani M. Gunasekera, Peter A. M. van Hoof, Stefano Bianchi, Maryam Dehghanian, Gary J. Ferland
https://arxiv.org/abs/2510.12…

Fe XVIII-XXIV K beta Inner-shell Absorption Lines in the X-ray Spectra of Neutron Star and Black Hole Binaries with XRISM
The advent of the X-ray microcalorimeter spectrometer Resolve onboard the XRISM space telescope opened a new era for high-resolution X-ray spectroscopy of astrophysical plasmas. Many spectral features were newly detected, including the K alpha and K beta inner-shell transition lines of mildly ionized (F- to Li-like) Fe at 6-8 keV in the spectra of X-ray binaries and active galactic nuclei. The widely used atomic databases contain information on the K alpha but not K beta lines of these ions. We…

Probing the Physics of Dusty Outflows through Complex Organic Molecules in the Early Universe
Andrey Vayner, Tanio D\'iaz-Santos, Carl D. Ferkinhoff, Peter R. M. Eisenhardt, Daniel Stern, Lee Armus, Brandon S. Hensley, Daniel Angl\'es-Alc\'azar, Roberto J. Assef, Rom\'an Fern\'andez Aranda, Andrew W. Blain, Hyunsung D. Jun, Norman W. Murray, Shelley Wright, Chao-Wei Tsai, Thomas Lai, Niranjan Chandra Roy, Drew Brisbin, Manuel Aravena, Jorge Gonz\'alez-L\'ope…

Probing the Physics of Dusty Outflows through Complex Organic Molecules in the Early Universe
Galaxy-scale outflows are of critical importance for galaxy formation and evolution. Dust grains are the main sites for the formation of molecules needed for star formation but are also important for the acceleration of outflows that can remove the gas reservoir critical for stellar mass growth. Using the MIRI medium-resolution integral field spectrograph aboard the James Webb Space Telescope (JWST), we detect the 3.28 $μ$m aromatic and the 3.4 $μ$m aliphatic hydrocarbon dust features in abso…

Electromagnetic Observables of Weakly Collisional Black Hole Accretion
Vedant Dhruv, Ben Prather, Mani Chandra, Abhishek V. Joshi, Charles F. Gammie
https://arxiv.org/abs/2510.11365

Electromagnetic Observables of Weakly Collisional Black Hole Accretion
The black holes in the Event Horizon Telescope sources Messier 87* and Sagittarius A* (SgrA*) are embedded in a hot, collisionless plasma that is fully described in kinetic theory yet is usually modeled as an ideal, magnetized fluid. In this Letter, we present results from a new set of weakly collisional fluid simulations in which leading order kinetic effects are modeled as viscosity and heat conduction. Consistent with earlier, lower-resolution studies, we find that overall flow dynamics rema…

Germany reaffirms commitment to #SKAO as major contract signed: https://www.mpifr-bonn.mpg.de/announcements/2025/8 - OHB Digital Connect will supply 86 highly sensitive receivers for the SKA-Mid radio telescope, currently under construction in South Africa’s Northern Cape; the €10.7m contract is the first to be awarded to Germany since it joined the Observatory just under a year ago.

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Jiwon Shin (Chungnam National University), C. Y. Hui (Chungnam National University), Sangin Kim (Chungnam National University), Kwangmin Oh (Michigan State University), Ellis R. Owen (RIKEN, Osaka University)
https://arxiv.org/abs/2510.11215

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Using 16 years of data collected by Fermi Large Area Telescope and 1523 days of survey data from High Altitude Water Cherenkov (HAWC) Observatory, we discovered the long-sought second GeV-TeV connection towards the globular cluster (GC) UKS 1 (Shin et al. 2025). Gamma-ray spectroscopy suggests that the GeV emission can be attributed to both the pulsar magnetosphere and inverse Compton scattering (ICS) by the pulsar wind. In particular, the TeV peak is displaced from the cluster center by severa…

SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3-4 lambda/D from the Accelerating Star HIP 54515 / OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B - A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration: #Subaru Telescope Program: https://www.nao.ac.jp/en/news/science/2025/20251204-subaru.html

Accretion onto Reissner-Nordstr\"{o}m naked singularities
Tomasz Krajewski, W{\l}odek Klu\'zniak
https://arxiv.org/abs/2510.10043 https://arxiv.or…

Accretion onto Reissner-Nordström naked singularities
Nearly every galactic core contains a supermassive compact object, hypothesized to be a Kerr black hole. It was only with the advent of Event Horizon Telescope observations that the predictions of this hypothesis could be observationally tested for our own Galaxy, and the nearby elliptical M87, on spatial scales comparable to the gravitational radius. At the same time it became possible to test whether alternatives such as naked singularities in general relativity, or similar objects in alterna…

Bayesian Gaussian Methods for Robust Background Modeling in CALorimetric Electron Telescope (CALET) Gravitational-Wave Searches
Bisweswar Sen
https://arxiv.org/abs/2509.25893 ht…

Bayesian Gaussian Methods for Robust Background Modeling in CALorimetric Electron Telescope (CALET) Gravitational-Wave Searches
The search for gamma-ray counterparts to gravitational-wave events with the CALET Gamma-ray Burst Monitor (CGBM) requires accurate and robust background modeling. Previous CALET observing runs (O3 and O4) relied on averaged pre/post-event baselines or low-order polynomial fits, approaches that neglect correlated noise, temporal non-stationarity, and the propagation of background uncertainty into derived flux upper limits. These simplifications can lead to reduced sensitivity to faint or atypica…

Deep Learning Reconstruction on Crab LST-1 Data
Bastien Lacave, Tjark Miener, Alexander Cervi\~no
https://arxiv.org/abs/2509.24499 https://arxiv.org/pdf/25…

Deep Learning Reconstruction on Crab LST-1 Data
The Cherenkov Telescope Array Observatory (CTAO) is the next-generation ground-based observatory for very-high-energy (VHE) gamma-ray astronomy. The Large-Sized Telescope prototype, LST-1, located on the Canary Island of La Palma, is responsible for observation of the low-energy range of the VHE gamma-ray spectrum. It is undergoing commissioning and has already observed the Crab Nebula as a standard reference source. Accurate reconstruction of shower parameters (e.g. energy, direction, and part…

The Transit Signal of KOI-1755 Originates from a Background Eclipsing Binary Star — Extracting the Light Curve of a Faint Background Star from #Kepler Target Pixel File Data: https://iopscience.iop.org/article/10.3847/1538-3881/ade718 -> Researchers Uncover True Source of KOI-1755 Transit Signal Using Kepler Space Telescope: https://english.cas.cn/newsroom/research_news/phys/202509/t20250904_1053933.shtml

The Molecular Inventory of TMC-1 with GOTHAM Observations: #MolecularCloud