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FIR colours and SEDs of nearby galaxies observed with Herschel

A. Boselli, L. Ciesla, P. S. Barklem, L. Cortese, R. Auld, M. Baes, G. J. Bendo, S. Bianchi, J. J. Bock, D. J. Bomans, C. M. Bradford, J. W. Barnes, P. Chanial, S. Charlot, M. Clemens, D. L. Clements, E. Corbelli, A. Cooray, D. Cormier, A. Dariush, J. Davies, I. De Looze, S. Di Serego Alighieri, E. Dwek, S. Eales, D. Elbaz, D. Fadda, J. Fritz, M. Galametz, F. Galliano, D. A. Garcia-Appadoo, G. Gavazzi, W. Gear, C. Giovanardi, J. Glenn, H. Gomez, M. Griffin, M. Grossi, S. Hony, T. Hughes, L. K. Hunt, K. Isaak, A. Jones, L. Levenson, N. Lu, S. C. Madden, B. O'Halloran, K. Okumura, S. Oliver, M. Page, P. Panuzzo, A. Papageorgiou, T. Parkin, I. Perez-Fournon, D. Pierini, M. Pohlen, N. Rangwala, E. Rigby, H. Roussel, A. Rykala, S. Sabatini, W. Ball, S. Barnes, M. Bergemann, A. Birch, M. W. L. Smith, L. Spinoglio, J. A. Stevens, S. Sundar, M. Symeonidis, M. Trichas, M. Vaccari, J. Verstappen, L. Vigroux, C. Vlahakis, C. Wilson, H. Wozniak, G. Wright, E. M. Xilouris, W. Zeilinger, S. Zibetti

Abstract
We present infrared colours(in the 25-500 mum 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. Herschel is an ESA space observatory with science instruments provided by Principal Investigator consortia. It is open for proposals for observing time from the worldwide astronomical community.

Keywords
galaxies: ISM - galaxies: spiral - galaxies: elliptical: and: lenticular - cD - infrared: galaxies

Astronomy and Astrophysics
Volume 518, Number of pages L61_1
2010 July

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia