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dc.contributor.authorSeymour, Nick
dc.contributor.authorSymeonidis, M.
dc.contributor.authorPage, M.
dc.contributor.authorHuynh, M.
dc.contributor.authorDwelly, T.
dc.contributor.authorMcHardy, I.
dc.contributor.authorRieke, G.
dc.identifier.citationSeymour, N. and Symeonidis, M. and Page, M. and Huynh, M. and Dwelly, T. and McHardy, I. and Rieke, G. 2010. The comoving infrared luminosity density: Domination of cold galaxies across 0 < z < 1. Monthly Notices of the Royal Astronomical Society. 402 (4): pp. 2666-2670.

In this paper, we examine the contribution of galaxies with different infrared (IR) spectral energy distributions (SEDs) to the comoving IR luminosity density (IRLD), a proxy for the comoving star formation rate (SFR) density. We characterize galaxies as having either a cold or hot IR SED depending on whether the rest-frame wavelength of their peak IR energy output is above or below 90 µm. Our work is based on a far-IR selected sample both in the local Universe and at high redshift, the former consisting of IRAS60 µm-selected galaxies at z < 0.07 and the latter of Spitzer70 µm selected galaxies across0.1 < z= 1. We find that the total IR luminosity densities for each redshift/luminosity bin agree well with results derived from other deep mid-/far-IR surveys. Atz < 0.07, we observe the previously known results that moderate luminosity galaxies(LIR < 1011 L?) dominate the total luminosity density and that the fraction of cold galaxies decreases with increasing luminosity, becoming negligible at the highest luminosities. Conversely, abovez= 0.1, we find that luminous IR galaxies(LIR > 1011 L?), the majority of which are cold, dominate the IRLD. We therefore infer that cold galaxies dominate the IRLD across the whole0 < z < 1 range, hence appear to be the main driver behind the increase in SFR density up toz~ 1 whereas local luminous galaxies are not, on the whole, representative of the high-redshift population. © 2010 The Authors. Journal compilation © 2010 RAS.

dc.publisherOxford University Press
dc.titleThe comoving infrared luminosity density: Domination of cold galaxies across 0 < z < 1
dc.typeJournal Article
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access via publisher

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