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Persistent URL http://purl.org/net/epubs/work/10918028
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Record Id 10918028
Title The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450-mu m-selected galaxies and their contribution to the cosmic infrared background
Abstract The first deep blank-field 450 ?m map (1? ? 1.3 mJy) from the Submillimetre Common- User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin of the Cosmological Evolution Survey field, in the footprint of the Hubble Space Telescope (HST) Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey. Using 60 submillimetre galaxies detected at ?3.75?, we evaluate the number counts of 450-?m-selected galaxies with flux densities S > 5 mJy. The 8 arcsec JCMT beam and high sensitivity of SCUBA-2 now make it possible to directly resolve a larger fraction of the cosmic infrared background (CIB, peaking at ?   200 ?m) into the individual galaxies responsible for its emission than has previously been possible at this wavelength. At S450 > 5 mJy, we resolve (7.4 ± 0.7) x 10 MJy sr of the CIB at 450 ?m (equivalent to 16 ± 7 per cent of the absolute brightness measured by the Cosmic Background Explorer at this wavelength) into point sources. A further  40 per cent of the CIB can be recovered through a statistical stack of 24 ?m emitters in this field, indicating that the majority (?60 per cent) of the CIB at 450 ?m is emitted by galaxies with S450 > 2 mJy. The average redshift of 450 ?m emitters identified with an optical/near-infrared counterpart is estimated to be ?z? = 1.3, implying that the galaxies in the sample are in the ultraluminous class (LIR ? 1.1 x 10 L?). If the galaxies contributing to the statistical stack lie at similar redshifts, then the majority of the CIB at 450 ?m is emitted by galaxies in the luminous infrared galaxy (LIRG) class with L > 3.6 x 10 L?. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Organisation STFC , RALSP , RALSP - SPD
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Language English (EN)
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Journal Article Mon Notic Roy Astron Soc 432, no. 1 (2013): 53-61. doi:10.1093/mnras/stt352 2013