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The CO-H2 conversion factor of diffuse ISM: Bright 12CO emission also traces diffuse gas

Published online by Cambridge University Press:  25 November 2011

M. Röllig ,
R. Simon ,
V. Ossenkopf ,
J. Stutzki ,
J. Pety ,
H.S. Liszt  and
R. Lucas
J. Pety
Affiliation:
Institut de Radioastronomie Millimétrique & Obs. de Paris, France. e-mail: pety@iram.fr ;
H.S. Liszt
Affiliation:
National Radio Astronomy Observatory, USA; e-mail: hliszt@nrao.edu ;
R. Lucas
Affiliation:
Joint ALMA Observatory, Chili; e-mail: rlucas@alma.cl ;
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Abstract

We show that the XCO factor, which converts the CO luminosity into the column density of molecular hydrogen has similar values for dense, fully molecular gas and for diffuse, partially molecular gas. We discuss the reasons of this coincidence and the consequences for the understanding of the interstellar medium.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 52: Conditions and Impact of Star Formation , 2011 , pp. 151 - 155
Copyright
© EAS, EDP Sciences 2011

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