Tootfinder

The effects of stellar feedback on molecular clumps in the Lagoon Nebula (M8)
K. Angelique Kahle (Max Planck Institute for Radio Astronomy, Max Planck Institute for Astronomy), Friedrich Wyrowski (Max Planck Institute for Radio Astronomy), Carsten K\"onig (Max Planck Institute for Radio Astronomy), Ivalu Barlach Christensen (Max Planck Institute for Radio Astronomy), Maitraiyee Tiwari (Max Planck Institute for Radio Astronomy), Karl M. Menten (Max Planck Institute for Radio Astron…

The effects of stellar feedback on molecular clumps in the Lagoon Nebula (M8)
The Lagoon Nebula (M8) is host to multiple regions with recent and ongoing massive star formation. With M8-Main and M8 East, two prominent regions of massive star formation have been studied in detail over the past years, while large parts of the nebula have received little attention. These largely unexplored regions comprise a large sample of molecular clumps that are affected by the presence of massive O- and B-type stars. We establish an inventory of species observed towards 37 known molecul…

🔭 The Great Observatory for Long Wavelengths (GO-LoW) proposal
#astronomy

The Great Observatory for Long Wavelengths (GO-LoW) proposal
Humankind has never before seen the low frequency radio sky. It is hidden from ground-based telescopes by the Earth's ionosphere and challenging to access from space with traditional missions because the long wavelengths involved (meter- to kilometer-scale) require infeasibly massive telescopes to see clearly.

Jean-Michel #Jarre NOW playing live at an astronomy festival in Slovakia: https://www.youtube.com/watch?v=GzjG95rB96Q. ADDENDUM: Seems this will stay online for a week. Meanwhile here is the grand finale filmed by an audience member: https://www.facebook.com/peachastro/videos/7340640009366778/

Sabahtan beri evde dark matter astronomy belgeselleri açıktı. Baygınlık gelip "müziiiiik" dedim. Spotify kapıyı buradan açtı. 80'lerin sonunda, 90'ların başında resmen milli marş gibi olmuştu bu bir ara.
https://open.spotify.com/track/1YQWosT

#Aurora over the New Forest, UK last night. 50.9 degrees N!
iPhone pic by my friend
#NorthernLights #astronomy

Current image of the Sun, via projection, from Nashville, Tennessee. Large sunspots visible. #Astronomy

Strong Lensing by Galaxy Clusters
Priyamvada NatarajanDepartment of Astronomy, Yale, Department of Physics, Yale, Yale Center for Astronomy \& Astrophysics, Liliya L. WilliamsMinnesota Institute for Astrophysics, University of Minnesota, Marusa BradacUniversity of California, Davis, University of Ljubljana, Claudio GrilloUniversity of Milan, Agniva GhoshMinnesota Institute for Astrophysics, University of Minnesota, Keren SharonUniversity of Michigan, Jenny WagnerBahamas Advanced St…

Strong Lensing by Galaxy Clusters
Galaxy clusters as gravitational lenses play a unique role in astrophysics and cosmology: they permit mapping the dark matter distribution on a range of scales; they reveal the properties of high and intermediate redshift background galaxies that would otherwise be unreachable with telescopes; they constrain the particle nature of dark matter and are a powerful probe of global cosmological parameters, like the Hubble constant. In this review we summarize the current status of cluster lensing ob…

This https://arxiv.org/abs/2402.14892 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Novelty Detection on Radio Astronomy Data using Signatures
We introduce SigNova, a new semi-supervised framework for detecting anomalies in streamed data. While our initial examples focus on detecting radio-frequency interference (RFI) in digitized signals within the field of radio astronomy, it is important to note that SigNova's applicability extends to any type of streamed data. The framework comprises three primary components. Firstly, we use the signature transform to extract a canonical collection of summary statistics from observational sequence…

🔊 #NowPlaying on #BBC6Music's #6MusicArtistCollection
Pink Floyd:
🎵 Astronomy Domine
#PinkFloyd
https://open.spotify.com/track/4AGlkKrwHJG42W0bCDxe9H
https://secretguest.bandcamp.com/track/astronomy-domine-pink-floyd

And in exactly five hours things are gonna get real: #IM1 launch which has a 95% chance for good weather. Some links, esp. regarding the astronomy payload ILO-X, in https://skyweek.wordpress.com/2024/02/14/nun-kommt-im-1-endlich-kommerziell-zum-mond

Max eclipse here in South Florida.
#Eclipse #astronomy #eclipse2024

Bounding the Photon Mass with Ultra-Wide Bandwidth Pulsar Timing Data and De-dispersed Pulses of Fast Radio Bursts
Yu-Bin Wang, Xia Zhou, Abdusattar Kurban, Fa-Yin Wang
https://arxiv.org/abs/2403.06422

Bounding the Photon Mass with Ultra-Wide Bandwidth Pulsar Timing Data and De-dispersed Pulses of Fast Radio Bursts
Exploring the concept of a massive photon has been an important area in astronomy and physics. If photons have mass, their propagation in non-vacuum space would be affected by both the non-zero mass $m_γ$ and the presence of a plasma medium. This would lead to a delay time proportional to $m_γ^2ν^{-4}$, which deviates from the classical dispersion relation (proportional to $ν^{-2}$). For the first time, we have derived the dispersion relation of a photon with a non-zero mass propagating in …

This https://arxiv.org/abs/2305.19003 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_grqc_…

Rapid identification of time-frequency domain gravitational wave signals from binary black holes using deep learning
Recent developments in deep learning techniques have offered an alternative and complementary approach to traditional matched filtering methods for the identification of gravitational wave (GW) signals. The rapid and accurate identification of GW signals is crucial for the progress of GW physics and multi-messenger astronomy, particularly in light of the upcoming fourth and fifth observing runs of LIGO-Virgo-KAGRA. In this work, we use the 2D U-Net algorithm to identify the time-frequency domai…

The metallicity gradients of star-forming regions store information of the assembly history of galaxies
F. Jara-FerreiraInstitute of Astronomy Pontificia Universidad Cat\'olica de Chile, N\'ucleo Milenio ERIS, P. B. TisseraInstitute of Astronomy Pontificia Universidad Cat\'olica de Chile, Centro de Astro-Ingenier\'ia Pontificia Universidad Cat\'olica de Chile, E. SilleroInstitute of Astronomy Pontificia Universidad Cat\'olica de Chile, Y. Rosas-GuevaraDonostia I…

The metallicity gradients of star-forming regions store information of the assembly history of galaxies
The variations in metallicity and spatial patterns within star-forming regions of galaxies result from diverse physical processes unfolding throughout their evolutionary history, with a particular emphasis in recent events. Analysing MaNGA and \textsc{eagle} galaxies, we discovered an additional dependence of the mass-metallicity relation (MZR) on metallicity gradients ($\nabla_{\rm (O/H)}$). Two regimes emerged for low and high stellar mass galaxies, distinctly separated at approximately ${\rm…

A Universe of Sound: processing NASA data into sonifications to explore participant response https://www.frontiersin.org/articles/10.3389/fcomm.2024.1288896/full "Data analyses from 3,184 sighted or blind or low-vision survey participants yielded sig…

A Universe of Sound: processing NASA data into sonifications to explore participant response
IntroductionHistorically, astronomy has prioritized visuals to present information, with scientists and communicators overlooking the critical need to communicate astrophysics with blind or low-vision audiences and provide novel channels for sighted audiences to process scientific information.MethodsThis study sonified NASA data of three astronomical objects presented as aural visualizations, then surveyed blind or low-vision and sighted individuals to elicit feedback on the experience of these…

Two recent Science Friday episodes about science and #accessibility:
“The World According To Sound: A Sonic History Of Astronomy”
https://www.sciencefriday.com/segments/son

The World According To Sound: A Sonic History Of Astronomy
A new podcast series examines sonified space data to explore pivotal moments throughout the history of astronomy.

Measuring White Dwarf Variability from Sparsely Sampled Gaia DR3 Multi-Epoch Photometry
Maya Steen (Department of Astronomy, Boston Univeristy, Department of Astronomy, New Mexico State University), J. J. Hermes (Department of Astronomy, Boston Univeristy), Joseph A. Guidry (Department of Astronomy, Boston Univeristy), Annabelle Paiva (Department of Astronomy, Boston Univeristy), Jay Farihi (Department of Physics & Astronomy, University College London), Tyler M. Heintz (Department …

Measuring White Dwarf Variability from Sparsely Sampled Gaia DR3 Multi-Epoch Photometry
White dwarf stars are ubiquitous in the Galaxy, and are essential to understanding stellar evolution. While most white dwarfs are photometrically stable and reliable flux standards, some can be highly variable, which can reveal unique details about the endpoints of low-mass stellar evolution. In this study we characterize a sample of high-confidence white dwarfs with multi-epoch photometry from Gaia Data Release 3. We compare these Gaia light curves with light curves from the Zwicky Transiting …

Didn't take many photos during the eclipse in the Eastern Topwnships in Quebec, but I did snap this nice one. With Venus (I think) very clearly visible.
#eclipse #quebec #venus

Astrophiz Astronomy Podcasts
Great Australian Pods Podcast Directory: #GreatAusPods

Astrophiz Astronomy | Great Australian Pods Podcast Directory
Podcast: Astrophiz Astronomy Podcasts Host: Brendan O’Brien Category: Science Sub-Category: Astronomy First Episode: 2016 Astrophiz An exceptional Astronomy podcast. Brendan sometimes even gets how…

I'm glad to be Mercury
#comicstrips #astronomy

Low-effort posts aren't restricted to AI, just had someone in my amateur astronomy discord post a (real) picture and (seriously) claim the Milky Way as "new discovery"

🧲 Hungry, hungry white dwarfs: Solving the puzzle of stellar metal pollution
#astronomy

Hungry, hungry white dwarfs: Solving the puzzle of stellar metal pollution
Dead stars known as white dwarfs, have a mass like the sun while being similar in size to Earth. They are common in our galaxy, as 97% of stars are white dwarfs. As stars reach the end of their lives, their cores collapse into the dense ball of a white dwarf, making our galaxy seem like an ethereal graveyard.

Spending Friday night updating a list of lists.
Book Club for Masochists: A Readers’ Advisory Podcast now has 85 different genre-based booklists of works by BIPOC (Black, Indigenous, & People of Colour) authors.
Including fiction genres from Dark Fantasy to Holiday Romance and non-fiction topics from Sports to Astronomy & Space.

This https://arxiv.org/abs/2310.17625 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The metallicity dependence and evolutionary times of merging binary black holes: Combined constraints from individual gravitational-wave detections and the stochastic background
The advent of gravitational-wave astronomy is now allowing for the study of compact binary merger demographics throughout the Universe. This information can be leveraged as tools for understanding massive stars, their environments, and their evolution. One active question is the nature of compact binary formation: the environmental and chemical conditions required for black hole birth and the time delays experienced by binaries before they merge. Gravitational-wave events detected today, howeve…

#Dark #energy was assumed to be a #constant force in the universe, both currently and throughout cosmic history.
But new data suggest that it may be more changeable, growing stronger or weaker over time, reversing or even fading aw…

A Tantalizing ‘Hint’ That Astronomers Got Dark Energy All Wrong
Scientists may have discovered a major flaw in their understanding of that mysterious cosmic force. That could be good news for the fate of the universe.

25 tips to take the best eclipse photos
https://www.astronomy.com/observing/25-tips-for-the-best-eclipse-photos/

25 tips to take the best eclipse photos
Cameras, tripods, filters, and more: Are you prepared to take pictures of the Great North American Eclipse?

Transdimensional inference for gravitational-wave astronomy with \texttt{Bilby}
Hui Tong, Nir Guttman, Teagan A. Clarke, Paul D. Lasky, Eric Thrane, Ethan Payne, Rowina Nathan, Ben Farr, Maya Fishbach, Gregory Ashton, Valentina Di Marco
https://arxiv.org/abs/2404.04460

Transdimensional inference for gravitational-wave astronomy with \texttt{Bilby}
It has become increasingly useful to answer questions in gravitational-wave astronomy using \textit{transdimensional} models where the number of free parameters can be varied depending on the complexity required to fit the data. Given the growing interest in transdimensional inference, we introduce a new package for the Bayesian inference Library (\texttt{Bilby}) called \texttt{tBilby}. The \texttt{tBilby}{} package allows users to set up transdimensional inference calculations using the existi…

Sound training platform applied to astronomy
Natasha Bertaina Lucero, Johanna Casado, Beatriz Garc\'ia, Gonzalo Cayo
https://arxiv.org/abs/2405.06042 h…

Low Complexity Radio Frequency Interference Mitigation for Radio Astronomy Using Large Antenna Array
Zaid Bin Tariq, Teviet Creighton, Louis P. Dartez, Naofal Al-Dhahir, Murat Torlak
https://arxiv.org/abs/2403.04250

Low Complexity Radio Frequency Interference Mitigation for Radio Astronomy Using Large Antenna Array
With the ongoing growth in radio communications, there is an increased contamination of radio astronomical source data, which hinders the study of celestial radio sources. In many cases, fast mitigation of strong radio frequency interference (RFI) is valuable for studying short lived radio transients so that the astronomers can perform detailed observations of celestial radio sources. The standard method to manually excise contaminated blocks in time and frequency makes the removed data useless…

AURORE BORÉALE EN COURS !!!! ICI EN CENTRE BRETAGNE #astrodon #astronomy #aurora_alert #aurora

Anisotropy ansatz for the axisymmetric Jeans equations
Leonardo De Deo (Department of Physics and Astronomy, University of Bologna, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, International PhD College-Collegio Superiore, University of Bologna), Luca Ciotti (Department of Physics and Astronomy, University of Bologna), Silvia Pellegrini (Department of Physics and Astronomy, University of Bologna, INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna)…

Anisotropy ansatz for the axisymmetric Jeans equations
The Jeans equations do not form a closed system, and to solve them a parametrization relating the velocity moments is often adopted. For axisymmetric models, a phenomenological choice (the "$b$-ansatz") is widely used for the relation between the vertical ($σ_z^2$) and radial ($σ_R^2$) components of the velocity dispersion tensor, thus breaking their identity present in two-integral systems. However, the way in which the ansatz affects the resulting kinematical fields can be quite complicated…

This https://arxiv.org/abs/2403.15721 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csDC_…

Design and Implementation of an Analysis Pipeline for Heterogeneous Data
Managing and preparing complex data for deep learning, a prevalent approach in large-scale data science can be challenging. Data transfer for model training also presents difficulties, impacting scientific fields like genomics, climate modeling, and astronomy. A large-scale solution like Google Pathways with a distributed execution environment for deep learning models exists but is proprietary. Integrating existing open-source, scalable runtime tools and data frameworks on high-performance comp…

Thomas K. Gaisser, a Pioneer of Particle Astrophysics
Francis Halzen, Paolo Lipari
https://arxiv.org/abs/2403.03207 https://arxiv.org/pdf/2403.03207
arXiv:2403.03207v1 Announce Type: new
Abstract: We describe the pioneering contributions of Thomas K. Gaisser to the birth and development of particle astrophysics, a new field of research at the intersection of cosmic ray physics, astronomy, astrophysics, and particle physics that has emerged in the last few decades. We will especially focus on his studies of natural beams of neutrinos: those generated by the interactions of cosmic rays in the Earth's atmosphere and those emitted by astrophysical sources. Tom actively participated in the discovery of these cosmic neutrinos as well. His contributions also extend to gamma-ray astronomy, the study of the cosmic ray spectra and composition, and the modeling of cosmic ray interactions in the atmosphere and in astrophysical environments. Tom invariably focused his research on the theoretical and phenomenological problems of greatest interest at the time, producing frameworks that transparently interpreted often complex data. These studies have been very influential and have shaped the development of the field.

The R2D2 deep neural network series paradigm for fast precision imaging in radio astronomy
Amir Aghabiglou, Chung San Chu, Arwa Dabbech, Yves Wiaux
https://arxiv.org/abs/2403.05452

The R2D2 deep neural network series paradigm for fast precision imaging in radio astronomy
Radio-interferometric (RI) imaging entails solving high-resolution high-dynamic range inverse problems from large data volumes. Recent image reconstruction techniques grounded in optimization theory have demonstrated remarkable capability for imaging precision, well beyond CLEAN's capability. These range from advanced proximal algorithms propelled by handcrafted regularization operators, such as the SARA family, to hybrid plug-and-play (PnP) algorithms propelled by learned regularization denois…

Design and Simulation of TiN-Based Suspended Meander Kinetic Inductance Detectors (KIDs) for Visible and Near-Infrared Astronomy Applications
Maria Appavou, Lucas Ribeiro, Paul Nicaise, Jie Hu, Jean-Marc Martin, Josiane Firminy, Christine Chaumont, Piercarlo Bonifacio, Faouzi Boussaha
https://arxiv.org/abs/2405.02837

Design and Simulation of TiN-Based Suspended Meander Kinetic Inductance Detectors (KIDs) for Visible and Near-Infrared Astronomy Applications
We report on simulations of a novel design of optical titanium nitride (TiN)- based Kinetic Inductance Detectors (KIDs) in order to improve their response to optical photons. We propose to separate the meander from the substrate to trap hot phonons generated by optical photons, preventing their rapid propagation through the substrate. These phonons would in turn contribute to the breaking of more Cooper pairs, thereby increasing the response of the detector. In our design, the meander is suspen…

I just read in a serious article that multiple teams of astronomers have detected a stochastic nanohertz (i.e. wavelengths on the order of tens of lightyears) gravitational wave background in the measured variations of millisecond #pulsars over a 15 year period.
I think I need to give my brain a rest period to absorb that.

"Now, the reason I'm showing you all this fun and games is not because I'm some kind of astronomy freak." —James Burke, "Connections"

This https://arxiv.org/abs/2312.04018 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csMS_…

Ricci-Notation Tensor Framework for Model-based Approaches to Imaging
Model-based approaches to imaging, like specialized image enhancements in astronomy, facilitate explanations of relationships between observed inputs and computed outputs. These models may be expressed with extended matrix-vector (EMV) algebra, especially when they involve only scalars, vectors, and matrices, and with n-mode or index notations, when they involve multidimensional arrays, also called numeric tensors or, simply, tensors. While this paper features an example, inspired by exoplanet …

Hoffnung: Ein kleiner Absatz in einem Newsletter. ✨
International Astronomical Union Outreach Newsletter, April 2024

Secular Structure of 1:2 and 1:3 Resonances with Neptune
Hailiang Li (School of Astronomy,Space Science, Nanjing University), Li-Yong Zhou (School of Astronomy,Space Science, Nanjing University)
https://arxiv.org/abs/2405.01911

Secular Structure of 1:2 and 1:3 Resonances with Neptune
The 1:N mean motion resonances with Neptune are of particular interest because they have two asymmetric resonance islands, where the distribution of trapped objects may bear important clues to the history of the Solar System. To explore the dynamics of these resonances and to investigate whether the imprints left by the early stage evolution can be preserved in the resonances, we conduct a comprehensive analyses on the 1:2 and 1:3 resonances. Adopt mainly the frequency analysis method, we calcu…

Astronomy's climate emissions: Global travel to scientific meetings in 2019
Andrea Gokus, Knud Jahnke, Paul M Woods, Vanessa A Moss, Volker Ossenkopf-Okada, Elena Sacchi, Adam R H Stevens, Leonard Burtscher, Cenk Kayhan, Hannah Dalgleish, Victoria Grinberg, Travis A Rector, Jan Rybizki, Jacob White
https://arxiv.org/abs/2405…

Astronomy's climate emissions: Global travel to scientific meetings in 2019
Travel to academic conferences -- where international flights are the norm -- is responsible for a sizeable fraction of the greenhouse gas (GHG) emissions associated with academic work. In order to provide a benchmark for comparison with other fields, as well as for future reduction strategies and assessments, we estimate the CO2-equivalent emissions for conference travel in the field of astronomy for the prepandemic year 2019. The GHG emission of the international astronomical community's 362 …

calendar event reminders:
-2.8 million years: HD 7977 flyby. disturbed ort cloud. (.48 light years / 1k AU, conflicting data)
-161,000 years: GJ 3379 (Giclas 99-49) flyby (4.08 light years)
40,000 years: voyager 2 passes within 1.7 light years of Ross 248, voyager 1 passes within 1.6 light years of Gliese 445
80,000 years: Ross 128 becomes closest star for 9,000 years. awkward that we sent nudes. (different graphic, I must be reading conflicting data... damn, ah whoops that's 248)
1.29 million years: Gliese 710 flyby (1/25 distance of proxima centuri, bright as a planet, .16 light years)
due to simultaneous messages, both star systems think we're cheating, but we're just polyamorous.
#astronomy

Quasi particle model vs lattice QCD thermodynamics: extension to $N_f=2 1 1$ flavors and momentum dependent quark masses
Maria Lucia Sambataro (Department of Physics and Astronomy 'E. Majorana', University of Catania, Laboratori Nazionali del Sud, INFN-LNS), Vincenzo Greco (Department of Physics and Astronomy 'E. Majorana', University of Catania, Laboratori Nazionali del Sud, INFN-LNS), Gabriele Parisi (Department of Physics and Astronomy 'E. Majorana', Universi…

Quasi particle model vs lattice QCD thermodynamics: extension to $N_f=2+1+1$ flavors and momentum dependent quark masses
In the last decade a Quasi-Particle Model ($QPM$) has supplied the basis for the study of HQ production in ultra-relativistic AA collisions, allowing for a phenomenological estimate of the HQ diffusion coefficient $D_s(T)$. Taking advantage of the new lattice QCD results for the Equation of State (EoS) with 2+1+1 dynamical flavors, we extend our $QPM$ approach from $N_f=2+1$ to $N_f=2+1+1$, in which the charm quark is included. Given an effective coupling $g(T)$ fixed by a fit to the lQCD energ…

I was about to make myself a career of programming PalmOS devices… and then pivoted to astronomy-related engineering, never to touch them again.
The Palm V was my first device, and a (company owned) Tungsten T3 my latest.
https://mastodon.social/@arstechnica/112331524…

Ars Technica (@arstechnica@mastodon.social)
Attached: 1 image Palm OS and the devices that ran it: An Ars retrospective Before smartphones, we had PDAs in our pockets. Palm did them best. https://arstechnica.com/gadgets/2024/04/palm-os-and-the-devices-that-ran-it-an-ars-retrospective/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social

The Sky This Week from March 29 to April 5: Comet Pons-Brooks puts on a show
https://www.astronomy.com/observing/the-sky-this-week-from-march-29-to-april-5-2024/

High-energy extension of the gamma-ray band observable with an electron-tracking Compton camera
Tomohiko Oka, Shingo Ogio, Mitsuru Abe, Kenji Hamaguchi, Tomonori Ikeda, Hidetoshi Kubo, Shunsuke Kurosawa, Kentaro Miuchi, Yoshitaka Mizumura, Yuta Nakamura, Tatsuya Sawano, Atsushi Takada, Taito Takemura, Toru Tanimori, Kei Yoshikawa
https://

High-energy extension of the gamma-ray band observable with an electron-tracking Compton camera
Although the MeV gamma-ray band is a promising energy-band window in astrophysics, the current situation of MeV gamma-ray astronomy significantly lags behind those of the other energy bands in angular resolution and sensitivity. An electron-tracking Compton camera (ETCC), a next-generation MeV detector, is expected to revolutionize the situation. An ETCC tracks each Compton-recoil electron with a gaseous electron tracker and determines the incoming direction of each gamma-ray photon; thus, it h…

Jodrell Bank's 'Lovell' telescope (photo again from probably 80 or 81); it's not far outside #Manchester and has been doing Radio astronomy since the 50's

Design and Simulation of TiN-Based Suspended Meander Kinetic Inductance Detectors (KIDs) for Visible and Near-Infrared Astronomy Applications
Maria Appavou, Lucas Ribeiro, Paul Nicaise, Jie Hu, Jean-Marc Martin, Josiane Firminy, Christine Chaumont, Piercarlo Bonifacio, Faouzi Boussaha
https://arxiv.org/abs/2405.02837

Design and Simulation of TiN-Based Suspended Meander Kinetic Inductance Detectors (KIDs) for Visible and Near-Infrared Astronomy Applications
We report on simulations of a novel design of optical titanium nitride (TiN)- based Kinetic Inductance Detectors (KIDs) in order to improve their response to optical photons. We propose to separate the meander from the substrate to trap hot phonons generated by optical photons, preventing their rapid propagation through the substrate. These phonons would in turn contribute to the breaking of more Cooper pairs, thereby increasing the response of the detector. In our design, the meander is suspen…

An almost 3hr video. Amazing!
astronomy has a colonialism problem #video

The First Estimation of the Ambipolar Diffusivity Coefficient from Multi-Scale Observations of the Class 0/I Protostar, HOPS-370
Travis J. Thieme (Institute of Astronomy, National Tsing Hua University, Center for Informatics and Computation in Astronomy, National Tsing Hua University, Department of Physics, National Tsing Hua University, Academia Sinica Institute of Astronomy and Astrophysics), Shih-Ping Lai (Institute of Astronomy, National Tsing Hua University, Center for Informatics…

The First Estimation of the Ambipolar Diffusivity Coefficient from Multi-Scale Observations of the Class 0/I Protostar, HOPS-370
Protostars are born in magnetized environments. As a consequence, the formation of protostellar disks can be suppressed by the magnetic field efficiently removing angular momentum of the infalling material. Non-ideal MHD effects are proposed to as one way to allow protostellar disks to form. Thus, it is important to understand their contributions in observations of protostellar systems. We derive an analytical equation to estimate the ambipolar diffusivity coefficient at the edge of the protost…

Yay, new visuals from #Odysseus! Namely from the small astronomy camera ILO-X from which many thumbnaiils and a few hi-res images taken during descent made it to Earth: see https://iloa.org/ilo-x-precursor/ and https://twitter.com/ILOA_Hawaii/status/1765135232221802734 for an animation of all good and bad pictures and https://skyweek.wordpress.com/2024/03/03/crew-8-vor-start-nachster-schichtwechsel-der-iss/ (scroll down) for five of the hi-res frames retrieved from it!

PASO -- Astronomy and Space Situational Awareness in a Dark Sky Destination
Domingos Barbosa, Bruno Coelho, Miguel Bergano, Constan\c{c}a Alves, Alexandre C. M. Correia, Lu\'is Cupido, Jos\'e Freitas, Lu\'is Gon\c{c}alves, Bruce Grossan, Anna Guerman, Allan K. de Almeida Jr., Dalmiro Maia, Bruno Morgado, Jo\~ao Pandeirada, Val\'erio Ribeiro, Gon\c{c}alo Rosa, George Smoot, Timoth\'ee Vaillant, Thyrso Villela, Carlos Alexandre Wuensche

PASO -- Astronomy and Space Situational Awareness in a Dark Sky Destination
The Pampilhosa da Serra Space Observatory (PASO) is located in the center of the continental Portuguese territory, in the heart of a certified Dark Sky destination by the Starlight Foundation (Aldeias do Xisto) and has been an instrumental asset to advance science, education and astrotourism certifications. PASO hosts astronomy and Space Situational Awareness (SSA) activities including a node of the Portuguese Space Surveillance \& Tracking (SST) infrastructure network, such as a space radar cu…

For years, historians thought decimal points emerged when German mathematician Christopher Clavius began using them while writing about astronomy in 1593.
But new evidence suggests the decimal point may be 150 years older than previously thought:
A 15th-century Venetian merchant named Giovanni Bianchini appears to have used the mathematical symbol in documents that date to between 1441 and 1450, according to a paper published this month in the journal Historia Mathematica.

calendar event reminders:
-2.8 million years: HD 7977 flyby. disturbed ort cloud. (.48 light years / 1k AU, conflicting data)
-161,000 years: GJ 3379 (Giclas 99-49) flyby (4.08 light years)
40,000 years: voyager 2 passes within 1.7 light years of Ross 248, voyager 1 passes within 1.6 light years of Gliese 445
80,000 years: Ross 128 becomes closest star for 9,000 years. awkward that we sent nudes. (different graphic, I must be reading conflicting data... damn, ah whoops that's 248)
1.29 million years: Gliese 710 flyby (1/25 distance of proxima centuri, bright as a planet, .16 light years)
due to simultaneous messages, both star systems think we're cheating, but we're just polyamorous.
#astronomy

🌕 You're Wrong About Tidal-Locking
#astronomy

Hurried Thoughts: You're Wrong About Tidal-Locking
Space Engine ...

Quasi particle model vs lattice QCD thermodynamics: extension to $N_f=2 1 1$ flavors and momentum dependent quark masses
Maria Lucia Sambataro (Department of Physics and Astronomy 'E. Majorana', University of Catania, Laboratori Nazionali del Sud, INFN-LNS), Vincenzo Greco (Department of Physics and Astronomy 'E. Majorana', University of Catania, Laboratori Nazionali del Sud, INFN-LNS), Gabriele Parisi (Department of Physics and Astronomy 'E. Majorana', Universi…

Quasi particle model vs lattice QCD thermodynamics: extension to $N_f=2+1+1$ flavors and momentum dependent quark masses
In the last decade a Quasi-Particle Model ($QPM$) has supplied the basis for the study of HQ production in ultra-relativistic AA collisions, allowing for a phenomenological estimate of the HQ diffusion coefficient $D_s(T)$. Taking advantage of the new lattice QCD results for the Equation of State (EoS) with 2+1+1 dynamical flavors, we extend our $QPM$ approach from $N_f=2+1$ to $N_f=2+1+1$, in which the charm quark is included. Given an effective coupling $g(T)$ fixed by a fit to the lQCD energ…

Tau Herculids 2022 from the McDonald Observatory, Texas -- a progress report
Norton Oliv\'er Szab\'o (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences), Antal Igaz (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences), L\'aszl\'o L. Kiss (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences, ELTE E\"otv\"os Lor\'and University, Institute of Physics), M\'arton R\'ozsahegyi (Konko…

Tau Herculids 2022 from the McDonald Observatory, Texas -- a progress report
As part of an intensive effort to observe the predicted 2022 Tau Herculids outburst, we recorded almost 800 individual meteor streaks on May 30th and 31st, 2022, using a high-sensitivity Sony~$α$7 camera. The video recordings were obtained under perfect conditions at the McDonald Observatory, Texas, USA. The meteor sample is dominated by the predicted Tau Herculids shower, however, we also noted significant activity of sporadic meteors and other possible weak showers. We found that the time of…

EIGER - Characterizing the Host #Galaxies of Luminous #Quasars at z ≳ 6: #JWST ... that telescope has already become a kinda unexciting normal thing for astronomy.)

This https://arxiv.org/abs/2311.05543 has been replaced.
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Inferring properties of dark galactic halos using strongly lensed gravitational waves
Gravitational waves (GWs) can be deflected, similarly to electromagnetic (EM) waves, by massive objects through the phenomenon of gravitational lensing. The importance of gravitational lensing for GW astronomy is becoming increasingly apparent in the GW detection era, in which nearly 100 events have already been detected. As current ground-based interferometers reach their design sensitivities, it is anticipated that these detectors may observe a few GW signals that are strongly lensed by the d…

This https://arxiv.org/abs/2402.19314 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Sources of high-energy astrophysical neutrinos
We discuss recent results in neutrino astronomy and their implications for the cosmic-ray acceleration in relativistic outflows, such as in Active Galactic Nuclei (AGN) jets, Gamma-Ray Bursts (GRBs), and Tidal Disruption Events (TDEs). We especially focus on challenges at the interface to particle acceleration which can be inferred from the multi-messenger context, such as the paradigm that the sources power the Ultra-High-Energy Cosmic Rays (UHECRs). We demonstrate that both AGN blazars (in th…

Multi-purpose InSTRument for Astronomy at Low-resolution: MISTRAL@OHP
J. Schmitt, C. Adami, M. Dennefeld, F. Agneray, S. Basa, J. C. Brunel, V. Buat, D. Burgarella, C. Carvalho, G. Castagnoli, N. Grosso, F. Huppert, C. Moreau, F. Moreau, L. Moreau, E. Muslimov, S. Pascal, S. Perruchot, D. Russeil, J. L. Beuzit, F. Dolon, M. Ferrari, B. Hamelin, A. LevanSuu, K. Aravind, D. Gotz, E. Jehin, E. LeFloc'h, J. Palmerio, A. Saccardi, B. Schneider, F. Sch\"ussler, D. Turpin, S. D. Verg…

Multi-purpose InSTRument for Astronomy at Low-resolution: MISTRAL@OHP
MISTRAL is the new Faint Object Spectroscopic Camera mounted at the folded Cassegrain focus of the 1.93m telescope of Haute-Provence Observatory. We describe the design and components of the instrument and give some details about its operation. We emphasise in particular the various observing modes and the performances of the detector. A short description is also given about the working environment. Various types of objects, including stars, nebulae, comets, novae, galaxies have been observed d…

On bursty star formation during cosmological reionization - how does it influence the baryon mass content of dark matter halos?
Anand Menon (International Centre for Radio Astronomy Research at The University of Western Australia), Chris Power (International Centre for Radio Astronomy Research at The University of Western Australia)
https://

On bursty star formation during cosmological reionization - how does it influence the baryon mass content of dark matter halos?
The baryon mass content of dark matter halos in the early Universe depends on global factors - e.g. ionising ultraviolet (UV) radiation background - and local factors - e.g. star formation efficiency and assembly history. We use a lightweight semi-analytical model to investigate how local and global factors impact halo baryon mass content at redshifts of $z\geq 5$. Our model incorporates a time delay between when stars form and when they produce feedback, which drive bursts of star formation, a…

After several years’ work by astronomers affiliated with the IAU CPS, a key UN body agreed last week to put on their agenda the issue of #SatelliteConstellations' impact on astronomy: https://cps.iau.org/news/united-nations-agrees-to-address-impact-of-satellite-constellations-on-astronomy/ and https://www.eso.org/public/announcements/ann24003/

Space Nuts
Great Australian Pods Podcast Directory: #GreatAusPods

Space Nuts | Great Australian Pods Podcast Directory
Podcast: Space Nuts Hosts: Professor Fred Watson and Andrew Dunkley Category: Science Sub-Category: Astronomy, Science Fiction First Episode: 2016 Join Professor Fred Watson…

This https://arxiv.org/abs/2402.19314 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Sources of high-energy astrophysical neutrinos
We discuss recent results in neutrino astronomy and their implications for the cosmic-ray acceleration in relativistic outflows, such as in Active Galactic Nuclei (AGN) jets, Gamma-Ray Bursts (GRBs), and Tidal Disruption Events (TDEs). We especially focus on challenges at the interface to particle acceleration which can be inferred from the multi-messenger context, such as the paradigm that the sources power the Ultra-High-Energy Cosmic Rays (UHECRs). We demonstrate that both AGN blazars (in th…

Ne22 distillation and the cooling sequence of the old metal-rich open cluster NGC 6791
Maurizio SalarisARI-Liverpool John Moores University, INAF-Osservatorio Astronomico d'Abruzzo, Simon BlouinDepartment of Physics and Astronomy, University of Victoria, Santi CassisiINAF-Osservatorio Astronomico d'Abruzzo, Luigi R. BedinINAF - Osservatorio Astronomico di Padova

Ne22 distillation and the cooling sequence of the old metal-rich open cluster NGC 6791
Recent Monte Carlo plasma simulations to study in crystallizing carbon-oxygen (CO) white dwarfs (WDs) the phase separation of Ne22 (the most abundant metal after carbon and oxygen) have shown that, under the right conditions, a distillation process that transports Ne22 toward the WD centre is efficient and releases a considerable amount of gravitational energy that can lead to cooling delays of up to several Gyr. Here we present the first CO WD stellar evolution models that self-consistently in…

Calibrating gravitational-wave search algorithms with conformal prediction
Gregory Ashton, Nicolo Colombo, Ian Harry, Surabhi Sachdev
https://arxiv.org/abs/2402.19313

Calibrating gravitational-wave search algorithms with conformal prediction
In astronomy, we frequently face the decision problem: does this data contain a signal? Typically, a statistical approach is used, which requires a threshold. The choice of threshold presents a common challenge in settings where signals and noise must be delineated, but their distributions overlap. Gravitational-wave astronomy, which has gone from the first discovery to catalogues of hundreds of events in less than a decade, presents a fascinating case study. For signals from colliding compact …

Exomoons & Exorings with the Habitable Worlds Observatory I: On the Detection of Earth-Moon Analog Shadows & Eclipses
Mary Anne Limbach, Jacob Lustig-Yaeger, Andrew Vanderburg, Johanna M. Vos, Rene Heller, Tyler D. Robinson
https://arxiv.org/abs/2405.02408

Exomoons & Exorings with the Habitable Worlds Observatory I: On the Detection of Earth-Moon Analog Shadows & Eclipses
The highest priority recommendation of the Astro2020 Decadal Survey for space-based astronomy was the construction of an observatory capable of characterizing habitable worlds. In this paper series we explore the detectability of and interference from exomoons and exorings serendipitously observed with the proposed Habitable Worlds Observatory (HWO) as it seeks to characterize exoplanets, starting in this manuscript with Earth-Moon analog mutual events. Unlike transits, which only occur in syst…

Oh, the prize for the most, well, original astronomy #acronym of April goes to: ELEPHANT, standing for "ExtragaLactic alErt Pipeline for Hostless AstroNomical Transients" ... really: https://arxiv.org/abs/2404.18165

Advancements in Streamlining Time-Domain and Multi-Messenger Astronomy Follow-Up Infrastructure at Keck Observatory
Chien-Hsiu Lee, Jeffrey A. Mader, Tyler Coda, Jo Hayashi, Max Brodheim, Lucas Fuhrman
https://arxiv.org/abs/2405.01500

Advancements in Streamlining Time-Domain and Multi-Messenger Astronomy Follow-Up Infrastructure at Keck Observatory
With active time-domain surveys like the Zwicky Transient Facility, the anticipated Rubin Observatory's Legacy Survey of Space and Time, and multi-messenger experiments such as LIGO/VIRGO/KANGRA for gravitational wave detection and IceCube for high-energy neutrino events, there is a new era in both time-domain and multi-messenger astronomy. The Astro2020 decadal survey highlights effectively responding to these astronomical alerts in a timely manner as a priority, and thus, there is an urgent n…

MHONGOOSE - A MeerKAT Nearby Galaxy HI Survey
W. J. G. de Blok (Netherlands Institute for Radio Astronomy), J. Healy (Netherlands Institute for Radio Astronomy), F. M. Maccagni (Netherlands Institute for Radio Astronomy, INAF - Osservatorio Astronomico di Cagliari), the MHONGOOSE survey team
https://arxiv.org/abs/2404.01774

MHONGOOSE - A MeerKAT Nearby Galaxy HI Survey
The MHONGOOSE (MeerKAT HI Observations of Nearby Galactic Objects: Observing Southern Emitters) survey maps the distribution and kinematics of the neutral atomic hydrogen (HI) gas in and around 30 nearby star-forming spiral and dwarf galaxies to extremely low HI column densities. The HI column density sensitivity (3 sigma over 16 km/s) ranges from ~ 5 x 10^{17} cm^{-2} at 90'' resolution to ~4 x 10^{19} cm^{-2} at the highest resolution of 7''. The HI mass sensitivity (3 sigma over 50 km/s) is …

The first pictures from the #Odysseus astronomy camera ILO-X are in! This one was taken with the wide field-of-view imager on 22 February 2024 about 4.2 minutes prior to touchdown which occurred 23:24 UTC: It shows craters in the Moon South Pole region as well as the IM-1 Odysseus lunar lander. See https://iloa.org/ilo-x-precursor/ for more: "To date, ILOA has received 9 high-resolution and 105 thumbnail images from the ILO-X imagers which will be shared as soon as the data has been processed internally."

This https://arxiv.org/abs/2309.08823 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Mapping the AMS-02 and CALET Data onto the Source Spectra and Residence Times of Galactic Cosmic Rays
The recent measurements of the spectral intensities of cosmic-ray nuclei have suggested that the ratio of Boron to Carbon nuclei, $R(E)$, comprises two components, $R_1(E)$ which carries all of the energy dependence and the other $R_A$, a constant independent of energy per nucleon. This finding supports the earlier theoretical expectations and results of gamma-ray astronomy that one of these components is attributable to spallation in a cocoon like region surrounding the sources and the other i…

🪨 New analysis reveals the brutal history of the Winchcombe meteorite's journey through space
https://phys.org/news/2024-04-analysis-reveals-brutal-history-winchcombe.html

New analysis reveals the brutal history of the Winchcombe meteorite's journey through space
Intensive new nano-analysis of the Winchcombe meteorite has revealed how it was affected by water and repeatedly smashed apart and reassembled on the journey it took through space before landing in an English sheep field in 2021.

Tracking the motion of a shock along a channel in the low solar corona
J. Rigney (Dublin Institute for Advanced Studies, Armagh Observatory and Planetarium, Queen's University Belfast), P. T. Gallagher (Dublin Institute for Advanced Studies), G. Ramsay (Armagh Observatory and Planetarium), J. G. Doyle (Armagh Observatory and Planetarium), D. M. Long (4 and3), O. Stepanyuk (Institute of Astronomy Bulgaria), K. Kozarev (Institute of Astronomy Bulgaria)

Tracking the motion of a shock along a channel in the low solar corona
Shock waves are excited by coronal mass ejections (CMEs) and large-scale extreme-ultraviolet (EUV) wave fronts and can result in low-frequency radio emission under certain coronal conditions. In this work, we investigate a moving source of low-frequency radio emission as a CME and an associated EUV wave front move along a channel of a lower density, magnetic field, and Alfvén speed in the solar corona. Observations from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory, …

Deeper Learning in Astronomy
Douglas Scott, Ali Frolop
https://arxiv.org/abs/2403.19937 https://arxiv.org/pdf/2403.19937

Deeper Learning in Astronomy
It is well known that the best way to understand astronomical data is through machine learning, where a "black box" is set up, inside which a kind of artificial intelligence learns how to interpret the features in the data. We suggest that perhaps there may be some merit to a new approach in which humans are used instead of machines to understand the data. This may even apply to fields other than astronomy.

LHAASO-KM2A detector simulation using Geant4
Zhen Cao, F. Aharonian, Q. An, Axikegu, Y. X. Bai, Y. W. Bao, D. Bastieri, X. J. Bi, Y. J. Bi, J. T. Cai, Q. Cao, W. Y. Cao, Zhe Cao, J. Chang, J. F. Chang, A. M. Chen, E. S. Chen, Liang Chen, Lin Chen, Long Chen, M. J. Chen, M. L. Chen, Q. H. Chen, S. H. Chen, S. Z. Chen, T. L. Chen, Y. Chen, N. Cheng, Y. D. Cheng, M. Y. Cui, S. W. Cui, X. H. Cui, Y. D. Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu, X. Q. Dong, K. K. Duan, J. H. Fan,…

LHAASO-KM2A detector simulation using Geant4
KM2A is one of the main sub-arrays of LHAASO, working on gamma ray astronomy and cosmic ray physics at energies above 10 TeV. Detector simulation is the important foundation for estimating detector performance and data analysis. It is a big challenge to simulate the KM2A detector in the framework of Geant4 due to the need to track numerous photons from a large number of detector units (>6000) with large altitude difference (30 m) and huge coverage (1.3 km^2). In this paper, the design of the KM…

Spectropolarimetry of Fraunhofer lines in local upper solar atmosphere
Z. Q. Qu (Yunnan Astronomical Observatories, CAS, Kunming, Yunnan, China, School of Astronomy and Space Science, University of Chinese Academy of Sciences, Chaoyang district, Beijing, China), L. Chang (Yunnan Astronomical Observatories, CAS, Kunming, Yunnan, China, School of Astronomy and Space Science, University of Chinese Academy of Sciences, Chaoyang district, Beijing, China), G. T. Dun (Yunnan Astronomical Obse…

Spectropolarimetry of Fraunhofer lines in local upper solar atmosphere
Spectropolarimetric results of Fraunhofer lines between 516.3nm and 532.6nm are presented in local upper solar chromosphere, transition zone and inner corona below a height of about 0.04 solar radius above the solar limb. The data were acquired on Nov.3, 2013 during a total solar eclipse in Gabon by the prototype Fiber Arrayed Solar Optical Telescope(FASOT). It is found that the polarization amplitudes of the Fraunhofer lines in these layers depend strongly on specific spectral lines. Fraunhofe…

Gas-phase condensation of carbonated silicate grains
Ga\"el Rouill\'e (Friedrich-Schiller-Universit\"at Jena, Max Planck Institute for Astronomy), Johannes Schmitt (Friedrich-Schiller-Universit\"at Jena, Max Planck Institute for Astronomy), Cornelia J\"ager (Friedrich-Schiller-Universit\"at Jena, Max Planck Institute for Astronomy), Thomas Henning (Max Planck Institute for Astronomy)

Gas-phase condensation of carbonated silicate grains
Reports on the detection of carbonates in planetary nebulae (PNe) and protostars suggested the existence of a mechanism that produce these compounds in stellar winds and outflows. A consecutive laboratory study reported a possible mechanism by observing the non-thermodynamic equilibrium (TE), gas-phase condensation of amorphous silicate grains with amorphous calcium carbonate inclusions. It concluded that water vapor was necessary to the formation of the carbonates. We present a laboratory stud…

This https://arxiv.org/abs/2304.07321 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons
Over the last decade, observations have shown that the mean mass of ultra-high-energy cosmic rays (UHECRs) increases progressively toward the highest energies. However, the precise composition is still unknown, and several theoretical studies hint at the existence of a subdominant proton component up to the highest energies. Motivated by the exciting prospect of performing charged-particle astronomy with ultra-high-energy (UHE) protons we quantify the level of UHE-proton flux that is compatible…

Large Projects in Astronomy: An Indian Endeavour
Yogesh Wadadekar, Shriharsh Tendulkar, Sanjit Mitra, Eswar Reddy, A. N. Ramaprakash, Timo Prusti, Juna Kollmeier, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.14841

Large Projects in Astronomy: An Indian Endeavour
Policy Brief on "Large Projects in Astronomy: An Indian Endeavour", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. Cutting-edge astronomy initiatives often entail substantial investment and require a high level of expertise. Even the most technologically advanced nations recognize the value of establishing international partnerships to secure both financial resources and …

The PARADIGM Project I: A Multiscale radio morphological analysis of local U/LIRGS
G. Lucatelli (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester), R. Beswick (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester), J. Moldon (Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, Instituto de Astrof\'isic…

The PARADIGM Project I: A Multiscale radio morphological analysis of local U/LIRGS
Disentangling the radio flux contribution from star formation (SF) and active-galactic-nuclei (AGN) activity is a long-standing problem in extragalactic astronomy, since at frequencies of $\lesssim$ 10 GHz, both processes emit synchrotron radiation. We present in this work the general objectives of the PARADIGM Project, a multi-instrument concept to explore star-formation and mass assembly of galaxies. We introduce two novel general approaches for a detailed multiscale study of the radio emissi…

Large Projects in Astronomy: An Indian Endeavour
Yogesh Wadadekar, Shriharsh Tendulkar, Sanjit Mitra, Eswar Reddy, A. N. Ramaprakash, Timo Prusti, Juna Kollmeier, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.14841

Large Projects in Astronomy: An Indian Endeavour
Policy Brief on "Large Projects in Astronomy: An Indian Endeavour", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. Cutting-edge astronomy initiatives often entail substantial investment and require a high level of expertise. Even the most technologically advanced nations recognize the value of establishing international partnerships to secure both financial resources and …

CME Deflection and East-West Asymmetry of ESP Intensity in Solar Cycles 23 and 24
Adolfo Santa Fe Due\~nas (Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, USA), Robert W. Ebert (Space Science and Engineering Division, Southwest Research Institute, San Antonio, TX, USA, Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA), Gang Li (Department of Space Science and CSPAR, University of Alabama in Huntsville,…

CME Deflection and East-West Asymmetry of ESP Intensity in Solar Cycles 23 and 24
We investigate the East-West asymmetry in energetic storm particle (ESP) heavy ion intensities at interplanetary shocks driven by coronal mass ejections (CMEs) during solar cycles (SCs) 23 and 24. We use observations from NASA's ACE and STEREO missions of helium (He), oxygen (O), and iron (Fe) intensities from ~0.13 to 3 MeV/nucleon. We examine the longitudinal distribution of ESP intensities and the correlation of ESP intensities with the near-Sun CME speed and the average transit CME speed fo…

Regional and Global Collaborations in Astronomy
Kazuhiro Sekiguchi, Jess McIver, Annapurni Subramaniam, Eswar Reddy, R. Srianand, Reinaldo R. Rosa, Stefano Andreon, Tarun Souradeep, Bernard Fanaroff, Rafael Santos, Paula Coehlo, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.14842<…

Regional and Global Collaborations in Astronomy
Policy Brief on "Regional and Global Collaborations in Astronomy", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. Astronomy brings together advanced scientific research, state-of-the-art technology, and educational initiatives, all while captivating and stimulating people of all ages. By doing so, it possesses the potential to serve as a powerful catalyst for sustainable g…

Regional and Global Collaborations in Astronomy
Kazuhiro Sekiguchi, Jess McIver, Annapurni Subramaniam, Eswar Reddy, R. Srianand, Reinaldo R. Rosa, Stefano Andreon, Tarun Souradeep, Bernard Fanaroff, Rafael Santos, Paula Coehlo, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.14842<…

Regional and Global Collaborations in Astronomy
Policy Brief on "Regional and Global Collaborations in Astronomy", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. Astronomy brings together advanced scientific research, state-of-the-art technology, and educational initiatives, all while captivating and stimulating people of all ages. By doing so, it possesses the potential to serve as a powerful catalyst for sustainable g…

Radio imaging of gravitationally lensed radio-quiet quasars
Neal Jackson (Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester, UK), Shruti Badole (Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester, UK), Thomas Dugdale (Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Manchester, UK), Hannah R. Stacey (European Sout…

Radio imaging of gravitationally lensed radio-quiet quasars
We present 6-GHz Very Large Array radio images of 70 gravitational lens systems at 300-mas resolution, in which the source is an optically-selected quasar, and nearly all of which have two lensed images. We find that about in half of the systems (40/70, with 33/70 secure), one or more lensed images are detected down to our detection limit of 20microJy/beam, similar to previous investigations and reinforcing the conclusion that typical optically-selected quasars have intrinsic GHz radio flux den…

This https://arxiv.org/abs/2403.06422 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Bounding the Photon Mass with Ultrawide Bandwidth Pulsar Timing Data and Dedispersed Pulses of Fast Radio Bursts
Exploring the concept of a massive photon has been an important area in astronomy and physics. If photons have mass, their propagation in nonvacuum space would be affected by both the nonzero mass $m_γ$ and the presence of a plasma medium. This would lead to a delay time proportional to $m_γ^2ν^{-4}$, which deviates from the classical dispersion relation (proportional to $ν^{-2}$). For the first time, we have derived the dispersion relation of a photon with a nonzero mass propagating in pla…

SDHDF: A new file format for spectral-domain radio astronomy data
L. J. Toomey, G. Hobbs, D. C. Price, J. R. Dawson, T. Wenger, D. Lagoy, L. Staveley-Smith, J. A. Green, E. Carretti, A. Hafner, M. Huynh, J. Kaczmarek, S. Mader, V. McIntyre, J. Reynolds, T. Robishaw, J. Sarkissian, A. Thompson, C. Tremblay, A. Zic
https://arxiv.o…

SDHDF: A new file format for spectral-domain radio astronomy data
Radio astronomy file formats are now required to store wide frequency bandwidths and multiple simultaneous receiver beams and must be able to account for versatile observing modes and numerous calibration strategies. The need to capture and archive high-time and high frequency-resolution data, along with the comprehensive metadata that fully describe the data, implies that a new data format and new processing software are required. This requirement is suited to a well-defined, hierarchically-st…

A new approach to analyse single-site video observations: A Tau Her 2022 case study
Norton Oliv\'er Szab\'o (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences, ELTE E\"otv\"os Lor\'and University, Institute of Physics), Antal Igaz (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences), M\'arton R\'ozsahegyi (Konkoly Observatory, CSFK Research Centre for Astronomy and Earth Sciences), Kriszti\'an S\'arn…

A new approach to analyse single-site video observations: A Tau Her 2022 case study
Here we present a continuation of the work that was based on video observations of the Tau Her 2022 outburst from the McDonald Observatory, Texas, US. On the night of the maximum in 2022 we detected 626 individual Tau Her meteors, for which we estimated photovisual magnitudes and analysed their distribution on the sky to determine the radiant position in an innovative way. The derived population index is $5.56 \pm 1.83$, while the radiant position for the mid-time of the observations is: $\math…

Diagnostics of 3D explosion asymmetries of stripped-envelope supernovae by nebular line profiles
Bart van Baal, Anders Jerkstrand, Annop Wongwathanarat, Thomas Janka
https://arxiv.org/abs/2404.01763

Diagnostics of 3D explosion asymmetries of stripped-envelope supernovae by nebular line profiles
Understanding the explosion mechanism and hydrodynamic evolution of core-collapse supernovae is a long-standing quest in astronomy. The asymmetries caused by the explosion are encoded into the line profiles which appear in the nebular phase of the SN evolution -- with particularly clean imprints in He star explosions. Here, we carry out nine different supernova simulations of He-core progenitors, exploding them in 3D with parametrically varied neutrino luminosities using the $\texttt{Prometheus…

Workforce Development in Astronomy and Astroinformatics
Kartik Sheth, Kevin Govender, Vanessa McBride, Laura Trouille, Puji Irawati, Rana Adhikari, Rafael Santos, Paula Coehlo, Giuseppe Longo, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.13295

Workforce Development in Astronomy and Astroinformatics
Policy Brief on "Workforce Development in Astronomy and Astroinformatics", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. The discipline of astronomy and astroinformatics is dynamically evolving thereby creating a compelling opportunity to foster a more inclusive, diverse, and proficient workforce. This is crucial for addressing multifaceted challenges that emerge as we pr…

R2D2 image reconstruction with model uncertainty quantification in radio astronomy
Amir Aghabiglou, Chung San Chu, Arwa Dabbech, Yves Wiaux
https://arxiv.org/abs/2403.18052

R2D2 image reconstruction with model uncertainty quantification in radio astronomy
The ``Residual-to-Residual DNN series for high-Dynamic range imaging'' (R2D2) approach was recently introduced for Radio-Interferometric (RI) imaging in astronomy. R2D2's reconstruction is formed as a series of residual images, iteratively estimated as outputs of Deep Neural Networks (DNNs) taking the previous iteration's image estimate and associated data residual as inputs. In this work, we investigate the robustness of the R2D2 image estimation process, by studying the uncertainty associated…

Global Data in Astronomy: Challenges and Opportunities
Renee Hlo\v{z}ek, Chenzhou Cui, Mark Allen, Patricia Whitelock, Jess McIver, Giuseppe Longo, Christopher Fluke, Ajit Kembhavi, Pranav Sharma, Ashish Mahabal
https://arxiv.org/abs/2402.12413

Global Data in Astronomy: Challenges and Opportunities
Policy Brief on "Global Data in Astronomy: Challenges and Opportunities", distilled from the corresponding panel that was part of the discussions during S20 Policy Webinar on Astroinformatics for Sustainable Development held on 6-7 July 2023. Astronomy is increasingly becoming a data-driven science. Advances in our understanding of the physical mechanisms at work in the Universe require building ever-more sensitive telescopes to gather observations of the cosmos to test and advance our theore…

Novelty Detection on Radio Astronomy Data using Signatures
Paola Arrubarrena, Maud Lemercier, Bojan Nikolic, Terry Lyons, Thomas Cass
https://arxiv.org/abs/2402.14892

Novelty Detection on Radio Astronomy Data using Signatures
We introduce SigNova, a new semi-supervised framework for detecting anomalies in streamed data. While our initial examples focus on detecting radio-frequency interference (RFI) in digitized signals within the field of radio astronomy, it is important to note that SigNova's applicability extends to any type of streamed data. The framework comprises three primary components. Firstly, we use the signature transform to extract a canonical collection of summary statistics from observational sequence…

Novelty Detection on Radio Astronomy Data using Signatures
Paola Arrubarrena, Maud Lemercier, Bojan Nikolic, Terry Lyons, Thomas Cass
https://arxiv.org/abs/2402.14892

Novelty Detection on Radio Astronomy Data using Signatures
We introduce SigNova, a new semi-supervised framework for detecting anomalies in streamed data. While our initial examples focus on detecting radio-frequency interference (RFI) in digitized signals within the field of radio astronomy, it is important to note that SigNova's applicability extends to any type of streamed data. The framework comprises three primary components. Firstly, we use the signature transform to extract a canonical collection of summary statistics from observational sequence…

Optimisation-based alignment of wideband integrated superconducting spectrometers for sub-mm astronomy
A. Moerman, K. Karatsu, S. J. C. Yates, R. Huiting, F. Steenvoorde, S. O. Dabironezare, T. Takekoshi, J. J. A. Baselmans, B. R. Brandl, A. Endo
https://arxiv.org/abs/2402.15381

Optimisation-based alignment of wideband integrated superconducting spectrometers for sub-mm astronomy
Integrated superconducting spectrometers (ISSs) for wideband sub-mm astronomy utilise quasi-optical systems for coupling radiation from the telescope to the instrument. Misalignment in these systems is detrimental to the system performance. The common method of using an optical laser to align the quasi-optical components requires accurate alignment of the laser to the sub-mm beam coming from the instrument, which is not always guaranteed to a sufficient accuracy. We develop an alignment strateg…

Optimisation-based alignment of wideband integrated superconducting spectrometers for sub-mm astronomy
A. Moerman, K. Karatsu, S. J. C. Yates, R. Huiting, F. Steenvoorde, S. O. Dabironezare, T. Takekoshi, J. J. A. Baselmans, B. R. Brandl, A. Endo
https://arxiv.org/abs/2402.15381

Optimisation-based alignment of wideband integrated superconducting spectrometers for sub-mm astronomy
Integrated superconducting spectrometers (ISSs) for wideband sub-mm astronomy utilise quasi-optical systems for coupling radiation from the telescope to the instrument. Misalignment in these systems is detrimental to the system performance. The common method of using an optical laser to align the quasi-optical components requires accurate alignment of the laser to the sub-mm beam coming from the instrument, which is not always guaranteed to a sufficient accuracy. We develop an alignment strateg…

ATAT: Astronomical Transformer for time series And Tabular data
G. Cabrera-Vives, D. Moreno-Cartagena, N. Astorga, I. Reyes-Jainaga, F. F\"orster, P. Huijse, J. Arredondo, A. M. Mu\~noz Arancibia, A. Bayo, M. Catelan, P. A. Est\'evez, P. S\'anchez-S\'aez, A. \'Alvarez, P. Castellanos, P. Gallardo, A. Moya, D. Rodriguez-Mancini
ht…

ATAT: Astronomical Transformer for time series And Tabular data
The advent of next-generation survey instruments, such as the Vera C. Rubin Observatory and its Legacy Survey of Space and Time (LSST), is opening a window for new research in time-domain astronomy. The Extended LSST Astronomical Time-Series Classification Challenge (ELAsTiCC) was created to test the capacity of brokers to deal with a simulated LSST stream. We describe ATAT, the Astronomical Transformer for time series And Tabular data, a classification model conceived by the ALeRCE alert broke…

CLEAN algorithm implementation comparisons between popular software packages
Daniel Wright, Karel Ad\'amek, Wesley Armour
https://arxiv.org/abs/2403.03091

CLEAN algorithm implementation comparisons between popular software packages
The CLEAN algorithm, first published by Högbom and its later variants such as Multiscale CLEAN (msCLEAN) by Cornwell, has been the most popular tool for deconvolution in radio astronomy. Interferometric imaging used in aperture synthesis radio telescopes requires deconvolution for removal of the telescopes point spread function from the observed images. We have compared source fluxes produced by different implementations of Högbom and msCLEAN (WSCLEAN, CASA) with a prototype implementation of…