H-Atlas: The cosmic abundance of dust from the far-infrared background power spectrum
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Date
2013Author
Thacker, Cameron
Cooray, Asantha
Jarvis, Matt
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We present a measurement of the angular power spectrum of the cosmic far-infrared background
(CFIRB) anisotropies in one of the extragalactic fields of the Herschel Astrophysical Terahertz Large
Area Survey (H-ATLAS) at 250, 350 and 500 μm bands. Consistent with recent measurements of
the CFIRB power spectrum in Herschel-SPIRE maps, we confirm the existence of a clear one-halo
term of galaxy clustering on arcminute angular scales with large-scale two-halo term of clustering
at 30 arcminutes to angular scales of a few degrees. The power spectrum at the largest angular
scales, especially at 250 μm, is contaminated by the Galactic cirrus. The angular power spectrum
is modeled using a conditional luminosity function approach to describe the spatial distribution of
unresolved galaxies that make up the bulk of the CFIRB.