Cool and warm dust emission from M33 (HerM33es)

• Published in: Astronomy and astrophysics (Berlin) Vol. 543; p. 1
• Main Authors: Xilouris, E M, Tabatabaei, F S, Boquien, M, Kramer, C, Buchbender, C, Bertoldi, F, Anderl, S, Braine, J, Verley, S, Relano, M, Quintana-Lacaci, G, Akras, S, Beck, R, Calzetti, D, Combes, F, Gonzalez, M, Gratier, P, Henkel, C, Israel, F, Koribalski, B, Lord, S, Mookerjea, B, Rosolowsky, E, Stacey, G, Tilanus, R P J, van der Tak, F, van der Werf, P
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01.07.2012
• Subjects: Astrophysics; Indexing in process; Physics; Sciences of the Universe; Solar and Stellar Astrophysics
• ISSN: 0004-6361; 1432-0746; 1432-0756
• DOI: 10.1051/0004-6361/201219291

In the framework of the open-time key program "Herschel M 33 extended survey," the authors study the far-infrared emission from the nearby spiral galaxy M 33 in order to investigate the physical properties of the dust such as its temperature and luminosity density across the galaxy. Taking advantage of the unique wavelength coverage of the Herschel Space Observatory and complementing their dataset with Spitzer-IRAC 5.8 and 8 mu m and Spitzer-MIPS 24 and 70 mu m data, they construct temperature and luminosity density maps by fitting two modified blackbodies of a fixed emissivity index of 1.5. They find that the "cool" dust grains are heated to temperatures of between 11 K and 28 K, with the lowest temperatures being found in the outskirts of the galaxy and the highest ones both at the center and in the bright HII regions. The infrared/submillimeter total luminosity is estimated to be ... (ProQuest: ... denotes formulae/symbols omitted.)