FIR colours and SEDs of nearby galaxies observed with Herschel

Boselli, A, Ciesla, L, Buat, V, Cortese, L, Oliver, S and et al, (2010) FIR colours and SEDs of nearby galaxies observed with Herschel. Astronomy and Astrophysics, 518. ISSN 0004-6361

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Abstract

We present infrared colours (in the 25-500 mu m spectral range) and UV to radio continuum spectral energy distributions of a sample of 51 nearby galaxies observed with SPIRE on Herschel. The observed sample includes all morphological classes, from quiescent ellipticals to active starbursts. Active galaxies have warmer colour temperatures than normal spirals. In ellipticals hosting a radio galaxy, the far-infrared (FIR) emission is dominated by the synchrotron nuclear emission. The colour temperature of the cold dust is higher in quiescent E-S0a than in star-forming systems probably because of the different nature of their dust heating sources (evolved stellar populations, X-ray, fast electrons) and dust grain properties. In contrast to the colour temperature of the warm dust, the f350/f500 index sensitive to the cold dust decreases with star formation and increases with metallicity, suggesting an overabundance of cold dust or an emissivity parameter beta <2 in low metallicity, active systems.

Item Type: Article
Additional Information: There are other external co-authors not recorded
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Seb Oliver
Date Deposited: 06 Feb 2012 20:03
Last Modified: 08 Jun 2012 13:01
URI: http://sro.sussex.ac.uk/id/eprint/23775
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