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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2010

Cool gas and dust in M33: Results from the Herschel M33 extended survey (HERM33ES)

E. Rosolowsky
S. Verley
M. Roellig
  • Fonction : Auteur
Paul van Der Werf

Résumé

We present an analysis of the first space-based far-IR-submm observations of M 33, which measure the emission from the cool dust and resolve the giant molecular cloud complexes. With roughly half-solar abundances, M33 is a first step towards young low-metallicity galaxies where the submm may be able to provide an alternative to CO mapping to measure their H2 content. In this Letter, we measure the dust emission cross-section using SPIRE and recent CO and Hi observations; a variation in is present from a near-solar neighborhood cross-section to about half-solar with the maximum being south of the nucleus. Calculating the total H column density from the measured dust temperature and cross-section, and then subtracting the Hi column, yields amorphology similar to that observed in CO. The H2/Hi mass ratio decreases from about unity to well below 10% and is about 15% averaged over the optical disk. The single most important observation to reduce the potentially large systematic errors is to complete the CO mapping of M 33.
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Dates et versions

hal-00484750 , version 1 (19-05-2010)

Identifiants

Citer

J. Braine, P. Gratier, C. Kramer, E.M. Xilouris, E. Rosolowsky, et al.. Cool gas and dust in M33: Results from the Herschel M33 extended survey (HERM33ES). Astronomy and Astrophysics - A&A, 2010, 518, pp.L69. ⟨10.1051/0004-6361/201014551⟩. ⟨hal-00484750⟩
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