The MACH HI absorption survey I: Physical conditions of cold atomic gas outside of the Galactic plane
| Autor: | Nicholas Killerby-Smith, Claire E. Murray, Naomi McClure-Griffiths, Snežana Stanimirović, Carl Heiles, Min-Young Lee, John M. Dickey, W. M. Goss |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Hydrogen Star formation chemistry.chemical_element FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galactic plane Astrophysics - Astrophysics of Galaxies Galaxy Interstellar medium Jansky chemistry Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Absorption (electromagnetic radiation) Astrophysics::Galaxy Astrophysics Radio astronomy |
| DOI: | 10.48550/arxiv.2106.15614 |
| Popis: | Tracing the transition between the diffuse atomic interstellar medium (ISM) and cold, dense gas is crucial for deciphering the star formation cycle in galaxies. Here we present MACH, a new survey of cold neutral hydrogen (HI) absorption at $21\rm\,cm$ by the Karl G. Jansky Very Large Array. We target 42 bright background sources with $600.001$ are ubiquitous ($c\sim100\%$), whereas high optical depths ($\tau>1$) are extremely rare ($c\sim0\%$). Comment: 33 pages, 16 figures. Accepted for publication in ApJS |
| Databáze: | OpenAIRE |
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