Cold dust and young starbursts: spectral energy distributions of Herschel SPIRE sources from the HerMES survey

November 2010 • 2010MNRAS.409....2R

Authors • Rowan-Robinson, M. • Roseboom, I. G. • Vaccari, M. • Amblard, A. • Arumugam, V. • Auld, R. • Aussel, H. • Babbedge, T. • Blain, A. • Bock, J. • Boselli, A. • Brisbin, D. • Buat, V. • Burgarella, D. • Castro-Rodriguez, N. • Cava, A. • Chanial, P. • Clements, D. L. • Conley, A. • Conversi, L. • Cooray, A. • Dowell, C. D. • Dwek, E. • Dye, S. • Eales, S. • Elbaz, D. • Farrah, D. • Fox, M. • Franceschini, A. • Gear, W. • Glenn, J. • González Solares, E. A. • Griffin, M. • Halpern, M. • Hatziminaoglou, E. • Huang, J. • Ibar, E. • Isaak, K. • Ivison, R. J. • Lagache, G. • Levenson, L. • Lu, N. • Madden, S. • Maffei, B. • Mainetti, G. • Marchetti, L. • Mortier, A. M. J. • Nguyen, H. T. • O'Halloran, B. • Oliver, S. J. • Omont, A. • Page, M. J. • Panuzzo, P. • Papageorgiou, A. • Patel, H. • Pearson, C. P. • Perez Fournon, I. • Pohlen, M. • Rawlings, J. I. • Raymond, G. • Rigopoulou, D. • Rizzo, D. • Schulz, B. • Scott, Douglas • Seymour, N. • Shupe, D. L. • Smith, A. J. • Stevens, J. A. • Symeonidis, M. • Trichas, M. • Tugwell, K. E. • Valtchanov, I. • Vigroux, L. • Wang, L. • Ward, R. • Wright, G. • Xu, C. K. • Zemcov, M.

Abstract • We present spectral energy distributions (SEDs) for 68 Herschel sources detected at 5σ at 250, 350 and 500 μm in the HerMES SWIRE-Lockman field. We explore whether existing models for starbursts, quiescent star-forming galaxies and active galactic nucleus dust tori are able to model the full range of SEDs measured with Herschel. We find that while many galaxies (~56 per cent) are well fitted with the templates used to fit IRAS, Infrared Space Observatory (ISO) and Spitzer sources, for about half the galaxies two new templates are required: quiescent (`cirrus') models with colder (10-20 K) dust and a young starburst model with higher optical depth than Arp 220. Predictions of submillimetre fluxes based on model fits to 4.5-24 μm data agree rather poorly with the observed fluxes, but the agreement is better for fits to 4.5-70 μm data. Herschel galaxies detected at 500 μm tend to be those with the highest dust masses.

Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

E-mail: m.rrobinson@imperial.ac.uk; mrr@imperial.ac.uk

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