Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of
Galaxies
N. McClure-Griffiths, S. Stanimirovic, and D. Rybarczyk. (2023)cite arxiv:2307.08464Comment: Manuscript (48 pages, 11 figures) accepted to Annual Reviews of Astronomy and Astrophysics for publication in Volume 61. This is the authors' own version. The final version, and associated supplementary material, will become available from: https://doi.org/10.1146/annurev-astro-052920-104851.
Abstract
Atomic hydrogen (HI) is a critical stepping stone in the gas evolution cycle
of the interstellar medium (ISM) of the Milky Way. Hi traces both the cold,
premolecular state before star formation and the warm, diffuse ISM before and
after star formation. This review describes new, sensitive HI absorption and
emission surveys, which, together with high angular and spectral resolution Hi
emission data, have revealed the physical properties of HI, its structure, and
its association with magnetic fields. We give an overview of the HI phases and
discuss how Hi properties depend on the environment and what its structure can
tell us about feedback in the ISM. Key findings include the following: - The
mass fraction of the cold neutral medium is $40$\% on average,
increasing with $A_V$ due to the increase of mean gas density. - The cold disk
extends to at least $R25$ kpc. - Approximately 40% of the HI is warm, with
structural characteristics that derive from feedback events. - Cold HI is
highly filamentary, whereas warm HI is more smoothly distributed. We summarize
future observational and simulation opportunities that can be used to unravel
the 3D structure of the atomic ISM and the effects of heating and cooling on HI
properties.
Description
Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of Galaxies
cite arxiv:2307.08464Comment: Manuscript (48 pages, 11 figures) accepted to Annual Reviews of Astronomy and Astrophysics for publication in Volume 61. This is the authors' own version. The final version, and associated supplementary material, will become available from: https://doi.org/10.1146/annurev-astro-052920-104851
%0 Generic
%1 mccluregriffiths2023atomic
%A McClure-Griffiths, Naomi M.
%A Stanimirovic, Snezana
%A Rybarczyk, Daniel R.
%D 2023
%K astrophysics
%T Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of
Galaxies
%U http://arxiv.org/abs/2307.08464
%X Atomic hydrogen (HI) is a critical stepping stone in the gas evolution cycle
of the interstellar medium (ISM) of the Milky Way. Hi traces both the cold,
premolecular state before star formation and the warm, diffuse ISM before and
after star formation. This review describes new, sensitive HI absorption and
emission surveys, which, together with high angular and spectral resolution Hi
emission data, have revealed the physical properties of HI, its structure, and
its association with magnetic fields. We give an overview of the HI phases and
discuss how Hi properties depend on the environment and what its structure can
tell us about feedback in the ISM. Key findings include the following: - The
mass fraction of the cold neutral medium is $40$\% on average,
increasing with $A_V$ due to the increase of mean gas density. - The cold disk
extends to at least $R25$ kpc. - Approximately 40% of the HI is warm, with
structural characteristics that derive from feedback events. - Cold HI is
highly filamentary, whereas warm HI is more smoothly distributed. We summarize
future observational and simulation opportunities that can be used to unravel
the 3D structure of the atomic ISM and the effects of heating and cooling on HI
properties.
@misc{mccluregriffiths2023atomic,
abstract = {Atomic hydrogen (HI) is a critical stepping stone in the gas evolution cycle
of the interstellar medium (ISM) of the Milky Way. Hi traces both the cold,
premolecular state before star formation and the warm, diffuse ISM before and
after star formation. This review describes new, sensitive HI absorption and
emission surveys, which, together with high angular and spectral resolution Hi
emission data, have revealed the physical properties of HI, its structure, and
its association with magnetic fields. We give an overview of the HI phases and
discuss how Hi properties depend on the environment and what its structure can
tell us about feedback in the ISM. Key findings include the following: - The
mass fraction of the cold neutral medium is $\lesssim 40$\% on average,
increasing with $A_V$ due to the increase of mean gas density. - The cold disk
extends to at least $R\sim 25$ kpc. - Approximately 40% of the HI is warm, with
structural characteristics that derive from feedback events. - Cold HI is
highly filamentary, whereas warm HI is more smoothly distributed. We summarize
future observational and simulation opportunities that can be used to unravel
the 3D structure of the atomic ISM and the effects of heating and cooling on HI
properties.},
added-at = {2023-08-14T09:18:15.000+0200},
author = {McClure-Griffiths, Naomi M. and Stanimirovic, Snezana and Rybarczyk, Daniel R.},
biburl = {https://www.bibsonomy.org/bibtex/2b6b893470c5f2759dd958f64c05fa05f/fboulang},
description = {Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of Galaxies},
interhash = {c86d628c8783d950d5b02494c4ac934f},
intrahash = {b6b893470c5f2759dd958f64c05fa05f},
keywords = {astrophysics},
note = {cite arxiv:2307.08464Comment: Manuscript (48 pages, 11 figures) accepted to Annual Reviews of Astronomy and Astrophysics for publication in Volume 61. This is the authors' own version. The final version, and associated supplementary material, will become available from: https://doi.org/10.1146/annurev-astro-052920-104851},
timestamp = {2023-08-14T09:18:15.000+0200},
title = {Atomic Hydrogen in the Milky Way: A Stepping Stone in the Evolution of
Galaxies},
url = {http://arxiv.org/abs/2307.08464},
year = 2023
}