Understanding infrared galaxy populations: the SWIRE legacy survey

Rowan-Robinson, M, Lonsdale, CJ, Smith, G, Surace, J., Shupe, D, Polletta, M, Siana, B, Baddedge, T, Oliver, Seb, Pérez-Fournon, I, Franceschini, A, Alfonso Luis, A, Clements, D, Davoodi, P, Domingue, D, Efstathiou, A, Fang, F, Farrah, D, Frayer, D, Hatziminaoglou, E, Gonzales-Solares, E, Xu, K, Padgett, Deborah and Vaccari, M (2006) Understanding infrared galaxy populations: the SWIRE legacy survey. Proceedings of Spitzer IR Diagnostics Conference, Nov 14-16, 2005.

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Abstract

We discuss spectral energy distributions, photometric redshifts, redshift distributions, luminosity functions, source-counts and the far infrared to optical luminosity ratio for sources in the SWIRE Legacy Survey. The spectral energy distributions of selected SWIRE sources are modelled in terms of a simple set of galaxy and quasar templates in the optical and near infrared, and with a set of dust emission templates (cirrus, M82 starburst, Arp 220 starburst, and AGN dust torus) in the mid infrared. The optical data, together with the IRAC 3.6 and 4.5 mu data, have been used to determine photometric redshifts. For galaxies with known spectroscopic redshifts there is a notable improvement in the photometric redshift when the IRAC data are used, with a reduction in the rms scatter from 10% in (1+z) to 5%. While further spectroscopic data are needed to confirm this result, the prospect of determining good photometric redshifts for the 2 million extragalactic objects in SWIRE is excellent. The distribution of the different infrared sed types in the L{ir}/L{opt} versus L{ir} plane, where L{ir} and L{opt} are the infrared and optical bolometric luminosities, is discussed. Source-counts at 24, 70 and 160 mu are discussed, and luminosity functions at 3.6 and 24 mu are presented.

Item Type: Article
Additional Information: Surace, Jason; Shupe, Dave; Polletta, Maria; Siana, Brian; Babbedge, Tom; Perez-Fournon, Ismael; Franceschini, Alberto; Afonso Luis, Alejandro; Clements, David; Davoodi, Payam; Domingue, Donovan; Efstathiou, Andreas; Fang, Fan; Farrah, Duncan; Frayer, Dave; Hatziminaoglou, Evanthia; Gonzalez-Solares, Eduardo; Xu, Kevin; Padgett, Deborah; Vaccari, Mattia
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: EPrints Services
Date Deposited: 06 Feb 2012 18:11
Last Modified: 04 Sep 2012 11:56
URI: http://sro.sussex.ac.uk/id/eprint/15144
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