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Resolving the Cosmic Far-Infrared Background at 450 and 850 Microns with SCUBA-2 | | Chian-Chou Chen
; Lennox L. Cowie
; Amy J. Barger
; Caitlin. M. Casey
; Nicholas Lee
; David B. Sanders
; Wei-Hao Wang
; Jonathan P. Williams
; | | Date: |
29 Aug 2013 | | Abstract: | We use the SCUBA-2 submillimeter camera mounted on the JCMT to obtain
extremely deep number counts at 450 and 850,$mu$m. We combine data on two
cluster lensing fields, A1689 and A370, and three blank fields, CDF-N, CDF-S,
and COSMOS, to measure the counts over a wide flux range at each wavelength. We
use statistical fits to broken power law representations to determine the
number counts. This allows us to probe to the deepest possible level in the
data. At both wavelengths our results agree well with the literature in the
flux range over which they have been measured, with the exception of the
850,$mu$m counts in CDF-S, where we do not observe the counts deficit found
by previous single-dish observations. At 450um, we detect significant counts
down to ~1mJy, an unprecedented depth at this wavelength. By integrating the
number counts above this flux limit, we measure 113.9^{+49.7}_{-28.4}
Jydeg$^{-2} of the 450um extragalactic background light (EBL). The majority of
this contribution is from sources with S_450um between 1-10mJy, and these
sources are likely to be the ones that are analogous to the local luminous
infrared galaxies (LIRGs). At 850um, we measure 37.3^{+21.1}_{-12.9} Jydeg^{-2}
of the EBL. Because of the large systematic uncertainties on the COBE
measurements, the percentage of the EBL we resolve could range from 48-153%
(44-178%) at 450 (850)um. Based on high-resolution SMA observations of around
half of the 4sigma 850um sample in CDF-N, we find that 12.5$^{+12.1}_{-6.8}% of
the sources are blends of multiple fainter sources. This is a low multiple
fraction, and we find no significant difference between our original SCUBA-2
850um counts and the multiplicity corrected counts. | | Source: | arXiv, 1308.6588 | | Services: | Forum | Review | PDF | Favorites | |
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