Cool gas and dust in M33: Results from the HERschel M33 Extended Survey (HERM33ES)
Artikel i vetenskaplig tidskrift, 2010
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.
stars: formation
ISM: clouds
galaxies: evolution
ISM
galaxies:
Local Group
graphite
galaxies: individual: M33
Författare
J. Braine
Laboratoire d'Astrophysique de Bordeaux
P. Gratier
Laboratoire d'Astrophysique de Bordeaux
C. Kramer
Instituto de Radioastronomia Milimetrica
E. M. Xilouris
National Observatory of Athens
E. Rosolowsky
The University of British Columbia
C. Buchbender
Instituto de Radioastronomia Milimetrica
M. Boquien
University of Massachusetts
D. Calzetti
University of Massachusetts
G. Quintana-Lacaci
Instituto de Radioastronomia Milimetrica
F. Tabatabaei
Max Planck Institut fur Radioastronomie
S. Verley
Universidad de Granada
F. P. Israel
Leiden Observatory Research Institute
F. F. S. van der Tak
SRON Netherlands Institute for Space Research
Susanne Aalto
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
F. Combes
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
S. G. Burillo
Observatorio Astronomico Nacional
M. Gonzalez
Instituto de Radioastronomia Milimetrica
C. Henkel
Max Planck Institut fur Radioastronomie
B. Koribalski
Australia Telescope National Facility
B. Mookerjea
Tata Institute of Fundamental Research
M. Roellig
Universitat zu Koln
K. Schuster
IRAM Institut de RadioAstronomie Millimetrique
M. Relano
University of Cambridge Institute of Astronomy
F. Bertoldi
Argelander-Institut für Astronomie
P. van der Werf
Leiden Observatory Research Institute
M. C. Wiedner
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L69 L69Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201014551