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Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel

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arxiv 1009.1058 v1 pith:XCV7NRHQ submitted 2010-09-06 astro-ph.CO

Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel

H.S. Hwang , D. Elbaz , G. E. Magdis , E. Daddi , M. Symeonidis , B. Altieri , A. Amblard , P. Andreani
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V. Arumugam R. Auld H. Aussel T. Babbedge S. Berta A. Blain J. Bock A. Bongiovanni A. Boselli V. Buat D. Burgarella N. Castro-Rodriguez A. Cava J. Cepa P. Chanial E. Chapin R.-R. Chary A. Cimatti D.L. Clements A. Conley L. Conversi A. Cooray H. Dannerbauer M. Dickinson H. Dominguez C.D. Dowell J.S. Dunlop E. Dwek S. Eales D. Farrah N. Forster Schreiber M. Fox A. Franceschini W. Gear R. Genzel J. Glenn M. Griffin C. Gruppioni M. Halpern E. Hatziminaoglou E. Ibar K. Isaak R.J. Ivison W.-S. Jeong G. Lagache D. Le Borgne E. Le Floc'h H.M. Lee J.C. Lee M.G. Lee L. Levenson N. Lu D. Lutz S. Madden B. Maffei B. Magnelli G. Mainetti R. Maiolino L. Marchetti A.M.J. Mortier H.T. Nguyen R. Nordon B. O'Halloran K. Okumura S.J. Oliver A. Omont M.J. Page P. Panuzzo A. Papageorgiou C.P. Pearson I. Perez-Fournon A.M. Perez Garcia A. Poglitsch M. Pohlen P. Popesso F. Pozzi J.I. Rawlings D. Rigopoulou L. Riguccini D. Rizzo G. Rodighiero I.G. Roseboom M. Rowan-Robinson A. Saintonge M. Sanchez Portal P. Santini M. Sauvage B. Schulz Douglas Scott N. Seymour L. Shao D.L. Shupe A.J. Smith J.A. Stevens E. Sturm L. Tacconi M. Trichas K.E. Tugwell M. Vaccari I. Valtchanov J.D. Vieira L. Vigroux L.Wang R. Ward G. Wright C.K. Xu M. Zemcov
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classification astro-ph.CO
keywords galaxiesdustlocalherschelsmgsdispersionfieldfind
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We study the dust properties of galaxies in the redshift range 0.1<z<2.8 observed by the Herschel Space Observatory in the field of the Great Observatories Origins Deep Survey-North as part of PEP and HerMES key programmes. Infrared (IR) luminosity (L_IR) and dust temperature (T_dust) of galaxies are derived from the spectral energy distribution (SED) fit of the far-infrared (FIR) flux densities obtained with PACS and SPIRE instruments onboard Herschel. As a reference sample, we also obtain IR luminosities and dust temperatures of local galaxies at z<0.1 using AKARI and IRAS data in the field of the Sloan Digital Sky Survey. We compare the L_IR-T_dust relation between the two samples and find that: the median T_dust of Herschel-selected galaxies at z>0.5 with L_IR>5x10^{10} L_\odot, appears to be 2-5 K colder than that of AKARI-selected local galaxies with similar luminosities; and the dispersion in T_dust for high-z galaxies increases with L_IR due to the existence of cold galaxies that are not seen among local galaxies. We show that this large dispersion of the L_IR-T_dust relation can bridge the gap between local star-forming galaxies and high-z submillimeter galaxies (SMGs). We also find that three SMGs with very low T_dust (<20 K) covered in this study have close neighbouring sources with similar 24-\mum brightness, which could lead to an overestimation of FIR/(sub)millimeter fluxes of the SMGs.

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