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A Global View of Molecule-Forming Clouds in the Galaxy

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Steven J. Gibson ,
Ward S. Howard ,
Christian S. Jolly ,
Jonathan H. Newton ,
Aaron C. Bell ,
Mary E. Spraggs ,
J. Marcus Hughes ,
Aaron M. Tagliaboschi ,
Christopher M. Brunt  and
A. Russell Taylor
...Show all authors
Steven J. Gibson
Affiliation:
Western Kentucky U.
Ward S. Howard
Affiliation:
Western Kentucky U. Union U. U. North Carolina-Chapel Hill
Christian S. Jolly
Affiliation:
Western Kentucky U. C. M. Gatton Acad.
Jonathan H. Newton
Affiliation:
Western Kentucky U. McMaster U.
Aaron C. Bell
Affiliation:
Western Kentucky U. U. Tokyo
Mary E. Spraggs
Affiliation:
Western Kentucky U. C. M. Gatton Acad.
J. Marcus Hughes
Affiliation:
Western Kentucky U. C. M. Gatton Acad.
Aaron M. Tagliaboschi
Affiliation:
Western Kentucky U.
Christopher M. Brunt
Affiliation:
Exeter U.
A. Russell Taylor
Affiliation:
U. Calgary U. Cape Town
Jeroen M. Stil
Affiliation:
U. Cape Town
Thomas M. Dame
Affiliation:
Harvard-CfA
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Abstract

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We have mapped cold atomic gas in 21cm line H i self-absorption (HISA) at arcminute resolution over more than 90% of the Milky Way's disk. To probe the formation of H2 clouds, we have compared our HISA distribution with CO J = 1-0 line emission. Few HISA features in the outer Galaxy have CO at the same position and velocity, while most inner-Galaxy HISA has overlapping CO. But many apparent inner-Galaxy HISA-CO associations can be explained as chance superpositions, so most inner-Galaxy HISA may also be CO-free. Since standard equilibrium cloud models cannot explain the very cold H i in many HISA features without molecules being present, these clouds may instead have significant CO-dark H2.

Keywords

radiative transfersurveysstars: formationISM: cloudsISM: evolutionISM: moleculesGalaxy: kinematics and dynamicsGalaxy: structureradio lines: ISM
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E27
Copyright
Copyright © International Astronomical Union 2016 

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