Results 1 to 10 of about 159,298 (239)

Probing the Cold Neutral Medium through H I Emission Morphology with the Scattering Transform

The Astrophysical Journal, 2023
Neutral hydrogen (H I ) emission exhibits complex morphology that encodes rich information about the physics of the interstellar medium. We apply the scattering transform (ST) to characterize the H I emission structure via a set of compact and ...
Minjie Lei, S. E. Clark
doaj   +3 more sources

On the distribution of the cold neutral medium in galaxy discs

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT The cold neutral medium (CNM) is an important part of the galactic gas cycle and a precondition for the formation of molecular and star-forming gas, yet its distribution is still not fully understood. In this work, we present extremely high resolution simulations of spiral galaxies with time-dependent chemistry such that we can ...
Rowan J Smith, Robin Tress, Juan D Soler, Ralf S Klessen, Simon C O Glover, Patrick Hennebelle, Sergio Molinari, Mordecai-Mark Mac Low, David Whitworth   +8 more
openaire   +6 more sources

Filamentary Molecular Cloud Formation via Collision-induced Magnetic Reconnection in a Cold Neutral Medium

The Astrophysical Journal
We have investigated the possibility of molecular cloud formation via the collision-induced magnetic reconnection (CMR) mechanism of the cold neutral medium (CNM).
Shuo Kong (孔朔), Rowan J. Smith, David Whitworth, Erika T. Hamden   +3 more
doaj   +6 more sources

Mapping a Lower Limit on the Mass Fraction of the Cold Neutral Medium Using Fourier-transformed H i 21 cm Emission Line Spectra: Application to the DRAO Deep Field from DHIGLS and the HI4PI Survey [PDF]

The Astrophysical Journal
We develop a new method for spatially mapping a lower limit on the mass fraction of the cold neutral medium by analyzing the amplitude structure of ${\hat{T}}_{b}({k}_{v})$ , the Fourier transform of T _b ( v ), the spectrum of the brightness temperature
Antoine Marchal, Peter G. Martin, Marc-Antoine Miville-Deschênes, Naomi M. McClure-Griffiths, Callum Lynn, Andrea Bracco, Luka Vujeva   +6 more
doaj   +5 more sources

A High-resolution Study of the Cold Neutral Medium in and around 30 Doradus

The Astrophysical Journal
With the aim of evaluating the roles of the cold neutral medium (CNM) in the cloud-scale baryon cycle, we perform a high-resolution study of the CNM in and around the extreme star-forming region 30 Doradus (30 Dor).
Gyueun Park, Min-Young Lee, John M. Dickey, Nick M. Pingel, James Dempsey, Helga Dénes, Steven Gibson, Katie Jameson, Ian Kemp, Chang-Goo Kim, Denis Leahy, Bumhyun Lee, Callum Lynn, Yik Ki Ma, Antoine Marchal, Naomi M. McClure-Griffiths, Eric Muller, Hiep Nguyen, Snežana Stanimirović, Jacco Th. Van Loon, (The GASKAP-H I collaboration)   +20 more
doaj   +3 more sources

The Local Group L-band Survey: The First Measurements of Localized Cold Neutral Medium Properties in the Low-metallicity Dwarf Galaxy NGC 6822

The Astrophysical Journal
Measuring the properties of the cold neutral medium (CNM) in low-metallicity galaxies provides insights into heating and cooling mechanisms in early Universe-like environments.
Nickolas M. Pingel, Hongxing Chen, Snežana Stanimirović, Eric W. Koch, Adam K. Leroy, Erik Rosolowsky, Chang-Goo Kim, Julianne J. Dalcanton, Fabian Walter, Michael P. Busch, Ryan Chown, Jennifer Donovan Meyer, Cosima Eibensteiner, Deidre A. Hunter, Sumit K. Sarbadhicary, Elizabeth Tarantino, Vicente Villanueva, Thomas G. Williams   +17 more
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OBSERVATIONS OF DECAMETER CARBON RADIO RECOMBINATION LINES IN SEVERAL GALACTIC DIRECTIONS. Part 1. EXPERIMENTAL STUDY [PDF]

Radio Physics and Radio Astronomy, 2023
Subject and Purpose. Since decameter carbon radio recombination lines (RRLs) were detected for the first time more than forty years ago, they have significantly extended our knowledge of the physics, kinematics and chemistry of the cold rarefied ...
Y. V. Vasylkivskyi, O. O. Konovalenko, S. V. Stepkin   +2 more
doaj   +1 more source

Metallicity Dependence of Molecular Cloud Hierarchical Structure at Early Evolutionary Stages

The Astrophysical Journal, 2023
The formation of molecular clouds out of H i gas is the first step toward star formation. Its metallicity dependence plays a key role in determining star formation throughout cosmic history.
Masato I. N. Kobayashi, Kazunari Iwasaki, Kengo Tomida, Tsuyoshi Inoue, Kazuyuki Omukai, Kazuki Tokuda   +5 more
doaj   +1 more source

Thermal Pressure in the Cold Neutral Medium of Nearby Galaxies [PDF]

The Astrophysical Journal, 2017
Abstract Dynamic and thermal processes regulate the structure of the multiphase interstellar medium (ISM), and ultimately establish how galaxies evolve through star formation. Thus, to constrain ISM models and better understand the interplay of these processes, it is of great interest to measure the thermal pressure (
R. Herrera-Camus, A. Bolatto, M. Wolfire, E. Ostriker, B. Draine, A. Leroy, K. Sandstrom, L. Hunt, R. Kennicutt, D. Calzetti, J. D. Smith, K. Croxall, M. Galametz, I. de Looze, D. Dale, A. Crocker, B. Groves   +16 more
openaire   +5 more sources

Modeling the statistics of the cold neutral medium in absorption-selected high-redshift galaxies [PDF]

Astronomy & Astrophysics, 2020
We present a statistical model of the selection function of cold neutral gas in high-redshift (z = 2.5) absorption systems. The model is based on the canonical two-phase model of the neutral gas in the interstellar medium and contains only one parameter for which we do not have direct observational priors: namely the central pressure of an L* halo at z 
Krogager, Jens-Kristian, Noterdaeme, Pasquier   +1 more
openaire   +2 more sources