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The CO-H2 conversion factor of diffuse ISM: Bright12CO 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: [email protected] ;
H.S. Liszt
Affiliation:
National Radio Astronomy Observatory, USA; e-mail: [email protected] ;
R. Lucas
Affiliation:
Joint ALMA Observatory, Chili; e-mail: [email protected] ;
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Abstract

We show that the XCO factor, which converts the CO luminosityinto the column density of molecular hydrogen has similar values for dense, fullymolecular gas and for diffuse, partially molecular gas. We discuss the reasons of thiscoincidence 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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References

Bigiel, F., et al., 2008, AJ, 136, 2846 CrossRef
Bohlin, R.C., et al., 1978, ApJ, 224, 132 CrossRef
Burgh, E.B., et al., 2007, ApJ, 658, 446 CrossRef
Burton, W.B., & Gordon, M.A., 1978, A&A, 63, 7 PubMed
Garwood, R.W., & Dickey, J.M., 1989, ApJ, 338, 841 CrossRef
Goldreich, P., & Kwan, J., 1974, ApJ, 189, 441 CrossRef
Goldsmith, P.F., et al., 2008, ApJ, 680, 428 CrossRef
Heiles, C., & Troland, T.H., 2003, ApJ, 586, 1067 CrossRef
Leroy, A.K., et al., 2008, AJ, 136, 2782 CrossRef
Liszt, H.S., 1982, ApJ, 262, 198 CrossRef
Liszt, H.S., 2007, A&A, 461, 205
Liszt, H.S., & Lucas, R., 1998, A&A, 339, 561
Liszt, H.S., Pety, J., & Lucas, R., 2010, A&A, 518, A45
Pety, J., Lucas, R., & Liszt, H.S., 2008, A&A, 489, 217
Rachford, B.L., et al., 2009, ApJS, 180, 125 CrossRef
Schlegel, D.J., Finkbeiner, D.P., & Davis, M., 1998, ApJ, 500, 525 CrossRef
Young, J.S., & Scoville, N., 1982, ApJ, 258, 467 CrossRef