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astro-ph.GA2026

Detecting HI Self-Absorption using Neural Networks

Eric G. M. Muller, Naomi M. McClure-Griffiths, Hiep Nguyen +5

Cold atomic hydrogen plays a crucial role in the life cycle of interstellar gas. It serves as the intermediary phase in the condensation and cooling processes that bridge the warm…

astro-ph.GA2026

The Neutral Atomic Hydrogen in the solar neighborhood (NeAtHood) project I. Ghost in the shell: Neutral atomic hydrogen in the extended Orion nebula

J. D. Soler, H. Beuther, S. C. O. Glover +15

The Orion Nebula is the nearest site of ongoing and recent high-mass star formation. It is a unique laboratory for studying the mass, energy, and momentum input from high-mass star…

astro-ph.GA2026

Revealing Galactic dust beneath the cosmic infrared background anisotropies with Wavelet Phase Harmonics

Srijita Sinha, Tuhin Ghosh, Erwan Allys +2

Separating Galactic dust emission from cosmic infrared background (CIB) anisotropies is challenging because both the emission components have similar spectral properties. The prima…

astro-ph.GA2026

Velocity-resolved [O I] 63,145 um, [C II] 158 um, and OH mapping along the Orion BN/KL explosive outflow and irradiated shocks

J. R. Goicoechea, R. Güsten, B. Godard +6

Stellar mergers produce explosive outflows that serve as transient sources of IR line luminosity and inject mechanical energy early into the natal molecular cloud. We present the f…

astro-ph.GA2026

Revealing the cold skeleton of the Magellanic Clouds and the Magellanic Bridge with ASKAP

James Dempsey, N. M. McClure-Griffiths, Antoine Marchal +14

We present the GASKAP-HI pilot absorption survey of neutral hydrogen (HI) in the Magellanic system. This survey provides 3219 sightlines across the Large (LMC) and Small Magellanic…

astro-ph.GA2026★ 1 cited

Are supernovae driving turbulence in the solar neighborhood?

Georges Abboudeh, Patrick Hennebelle, Juan D. Soler +9

Turbulence plays an important role in shaping the interstellar medium, and strongly influences star formation. We aim to identify the physical processes capable of sustaining HI tu…

astro-ph.GA2026

Calibrating Galaxy Infall Times in Groups and Clusters with IllustrisTNG Simulations

Florine Masson, Laura C. Parker

The time since a galaxy first became a satellite is central to understanding how environment drives galaxy evolution, yet it cannot be measured directly. Using the TNG300 and TNG-C…

astro-ph.GA2026

Untangling dust emission and cosmic infrared background anisotropies with the scattering transform statistics

Srijita Sinha, Tuhin Ghosh, Erwan Allys +2

The template-fit approach is often used to separate Galactic dust emission from cosmic infrared background (CIB) anisotropies in low column density regions, under the a…

astro-ph.GA2026

Spatially-resolved interstellar dust properties in the face-on spiral galaxy M 99 as observed by NIKA2

L. Pantoni, F. Galliano, S. C. Madden +62

Large dust grains in thermal equilibrium dominate the far-infrared and contribute to the millimetre continuum of star-forming galaxies, but constraining their properties is difficu…

astro-ph.GA2026

The contribution of neutral gas to Faraday tomographic data at low frequencies. A first extensive comparison between real and synthetic data

Jack Berat, Marc-Antoine Miville-Deschênes, Andrea Bracco +2

LOFAR observations of diffuse interstellar polarization at meter wavelengths reveal intricate polarized intensity structures with an unexpected correlation with neutral HI filament…

astro-ph.GA2025★ 1 cited

JWST observations of cosmic-ray-excited H in Barnard 68: spatial variations and constraints on cosmic-ray attenuation

David A. Neufeld, Kedron Silsbee, Alexei V. Ivlev +9

We present James Webb Space Telescope (JWST) NIRSpec observations of the starless dark cloud Barnard 68 that reveal the spatially-resolved signature of cosmic-ray excited molecular…

astro-ph.GA2025

MEGATRON: the impact of non-equilibrium effects and local radiation fields on the circumgalactic medium at cosmic noon

Corentin Cadiou, Harley Katz, Martin P. Rey +22

We present three cosmological radiation-hydrodynamic zoom simulations of the progenitor of a Milky Way-mass galaxy from the MEGATRON suite. The simulations combine on-the-fly radia…

astro-ph.GA2025★ 1 cited

MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations

Harley Katz, Martin P. Rey, Corentin Cadiou +21

We present the MEGATRON suite of cosmological radiation hydrodynamics simulations following the formation of Milky Way-mass galaxies from the earliest cosmic epochs when Population…

astro-ph.GA2025★ 1 cited

Variance of dust temperature and spectral index in Planck polarization data using spin-moment expansion

Vincent Guillet, Léo Vacher, Jonathan Aumont +4

Thermal dust is the major polarized foreground hindering the detection of primordial cosmic microwave background (CMB) B-modes. Its signal exhibits complex behavior in frequency sp…

astro-ph.GA2025★ 8 cited

MEGATRON: Disentangling Physical Processes and Observational Bias in the Multi-Phase ISM of High-Redshift Galaxies

Nicholas Choustikov, Harley Katz, Alex J. Cameron +10

Now detected out to redshifts of , the rest-frame ultraviolet and optical spectra of galaxies encode numerous physical properties of the interstellar medium (ISM). Accu…

astro-ph.GA2025★ 1 cited

MEGATRON: how the first stars can create an iron metallicity plateau in the smallest dwarf galaxies

Martin P. Rey, Harley Katz, Corentin Cadiou +23

We study the stellar mass-iron metallicity relation of dwarf galaxies in the new high-resolution MEGATRON cosmological radiation-hydrodynamics simulations. These simulations model…

astro-ph.GA2025★ 6 cited

The first detection of cosmic-ray excited H in interstellar space

Shmuel Bialy, Amit Chemke, David A. Neufeld +12

Stars and planets form within cold, dark molecular clouds. In these dense regions, where starlight cannot penetrate, cosmic rays (CRs) are the dominant source of ionization -- driv…

astro-ph.GA2025★ 1 cited

Tracers of the ionization fraction in dense and translucent molecular gas: II. Using mm observations to constrain ionization fraction across Orion B

Ivana Bešlić, Maryvonne Gerin, Viviana V. Guzmán +28

The ionization fraction () is a crucial parameter of interstellar gas, yet estimating it requires deep knowledge of molecular gas chemistry…

astro-ph.GA2025

Observations of Carbon Radio Recombination Lines with the NenuFAR telescope. I. Cassiopeia A and Cygnus A

Lucie Cros, Antoine Gusdorf, Philippe Salomé +26

Carbon Radio Recombination Lines (CRRLs) at decametre wavelengths trace the diffuse phase of the interstellar medium (ISM) of the Galaxy. Their observation allows to measure physic…

astro-ph.GA2025★ 5 cited

PDRs4All XV: CH radical and H molecular ion in the irradiated protoplanetary disk d203-506

I. Schroetter, O. Berné, J. R. Goicoechea +20

Most protoplanetary disks experience a phase in which they are subjected to strong ultraviolet radiation from nearby massive stars. This UV radiation can substantially alter their…

astro-ph.GA2025★ 2 cited

Multiscale Turbulence Synthesis: Validation in 2D Hydrodynamics

Pierre Lesaffre, Jean-Baptiste Durrive, Jean Goossaert +5

Numerical simulations can follow the evolution of fluid motions through the intricacies of developed turbulence. However, they are rather costly to run, especially in 3D. In the pa…

astro-ph.GA2025★ 1 cited

Estimating the dense gas mass of molecular clouds using spatially unresolved 3 mm line observations

Antoine Zakardjian, Annie Hughes, Jérôme Pety +28

We aim to develop a new method to infer the sub-beam probability density function (PDF) of H2 column densities and the dense gas mass within molecular clouds using spatially unreso…

astro-ph.GA2025★ 3 cited

A neutral hydrogen absorption study of cold gas in the outskirts of the Magellanic Clouds using the GASKAP-HI survey

Hongxing Chen, Snežana Stanimirović, Nickolas M. Pingel +18

Cold neutral hydrogen (HI) is a crucial precursor for molecular gas formation and can be studied via HI absorption. This study investigates HI absorption in low column density regi…

astro-ph.GA2025★ 11 cited

ALMA-IMF XVII -- Census and lifetime of high-mass prestellar cores in 14 massive protoclusters

M. Valeille-Manet, S. Bontemps, T. Csengeri +24

High-mass prestellar cores are extremely rare. The search for such objects has long been hindered by small sample sizes, leading to large uncertainties in their lifetimes and the c…