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arXiv · 0911.4134

The Comoving Infrared Luminosity Density: Domination of Cold Galaxies across 0<z<1

N. Seymour·M. Symeonidis·M. J. Page·M. Huynh·T. Dwelly·I. M. McHardy·G. Rieke
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Abstract

In this paper we examine the contribution of galaxies with different infrared (IR) spectral energy distributions (SEDs) to the comoving infrared luminosity density, a proxy for the comoving star formation rate (SFR) density. We characterise galaxies as having either a cold or hot IR SED depending upon whether the rest-frame wavelength of their peak IR energy output is above or below 90um. Our work is based on a far-IR selected sample both in the local Universe and at high redshift, the former consisting of IRAS 60um-selected galaxies at z<0.07 and the latter of Spitzer 70um selected galaxies across 0.1 10^11 Lsun), the majority of which are cold, dominate the IR luminosity density. We therefore infer that cold galaxies dominate the IR luminosity density across the whole 0<z<1 range, hence appear to be the main driver behind the increase in SFR density up to z~1 whereas local luminous galaxies are not, on the whole, representative of the high redshift population.

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N. Seymour, M. Symeonidis, M. J. Page, M. Huynh, T. Dwelly, I. M. McHardy, G. Rieke. 2009-11-21. The Comoving Infrared Luminosity Density: Domination of Cold Galaxies across 0<z<1. https://doi.org/10.1111/j.1365-2966.2009.16083.x

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