The Evolution of the Far-Infrared Luminosity Function in the Spitzer Wide-area Infrared Extragalactic Legacy Survey

Details The Evolution of the Far-Infrared Luminosity Function in the Spitzer Wide-area Infrared Extragalactic Legacy Survey The Evolution of the Far-Infrared Luminosity Function in the Spitzer Wide-area Infrared Extragalactic Legacy Survey

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743029p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #430.29; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We construct the rest-frame luminosity functions (LFs) at 70 and 160 μm using data from the Spitzer Wide-area Infrared Extragalactic (SWIRE) survey in the XMMLSS and Lockman-Hole fields. The 70 μm LF constructed over the redshift range 0 < z < 1 shows strong positive evolution and can be demonstrated as being pure luminosity evolution (modelled as L*(z) ∝ (1+z)P) with P = 3.57±0.1. Modelling the 70μm LF with luminosity and density evolution model (modelled as φ* ∝ (1+z)Q) gave P = 3.51± 0.35 and Q = 0.13±0.7. The 160μm LF was computed in the redshift range 0 < z < 0.6 and modelled with the pure luminosity evolution with P = 2.36±0.2. We use the 70μm LF to derive the infrared (IR) energy density and star formation rate (SFR) and modelling it as ∝ (1+z)γ gave γ = 4.1±0.1. We find that luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) contribute 20±5% to the total IR luminosity density at z 0 and increases to 65±10% by z = 1, which shows that at z 1 most of the star formation is produced by LIRGs and ULIRGs. Our results are in agreement with similar studies carried out with Spitzer at 24μm. I thank the Science and Technology Funding Council (STFC) for the financial support.

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