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Cool gas and dust in M33: Results from the HERschel M33 Extended Survey (HERM33ES)

J. Braine ; P. Gratier ; C. Kramer ; E. M. Xilouris ; E. Rosolowsky ; C. Buchbender ; M. Boquien ; D. Calzetti ; G. Quintana-Lacaci ; F. Tabatabaei ; S. Verley ; F. Israel ; F. van der Tak ; Susanne Aalto (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; F. Combes ; S. Garcia-Burillo ; M. Gonzalez ; C. Henkel ; B. Koribalski ; B. Mookerjea ; M. Roellig ; K. F. Schuster ; M. Relano ; F. Bertoldi ; P. van der Werf ; M. Wiedner
Astronomy and Astrophysics (0004-6361). Vol. 518 (2010), Article Number: L69,
[Artikel, refereegranskad vetenskaplig]

We present an analysis of the first space-based far-IR-submm observations of M33, 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 H-2 content. In this Letter, we measure the dust emission cross-section sigma using SPIRE and recent CO and HI observations; a variation in s 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 a morphology similar to that observed in CO. The H-2/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 M33.

Nyckelord: galaxies: individual: M33, Local Group, galaxies: evolution, galaxies:, ISM, ISM: clouds, stars: formation, graphite



Denna post skapades 2010-12-02. Senast ändrad 2015-07-10.
CPL Pubid: 129988

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur