Astrophys. J., 776, 131 (2013/October-3)
Resolving the cosmic far-infrared background at 450 and 850 µm with SCUBA-2.
CHEN C.-C., COWIE L.L., BARGER A.J., CASEY C.M., LEE N., SANDERS D.B., WANG W.-H. and WILLIAMS J.P.
Abstract (from CDS):
We use the SCUBA-2 submillimeter camera mounted on the James Clerk Maxwell Telescope to obtain extremely deep number counts at 450 and 850 µm. 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 µm counts in CDF-S, where we do not observe the counts deficit found by previous single-dish observations. At 450 µm, we detect significant counts down to ∼1 mJy, an unprecedented depth at this wavelength. By integrating the number counts above this flux limit, we measure 113.9–28.4+49.7 Jy deg–2 of the 450 µm extragalactic background light (EBL). The majority of this contribution is from sources with S_450 µm_ between 1-10 mJy, and these sources are likely to be the ones that are analogous to the local luminous infrared galaxies. At 850 µm, we measure 37.3–12.9 +21.1 Jy deg–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) µm. Based on high-resolution Submillimeter Array observations of around half of the 4 σ 850 µm sample in CDF-N, we find that 12.5–6.8+12.1% 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-2 850 µm counts and the multiplicity-corrected counts.
cosmology: observations - galaxies: formation - galaxies: starburst - gravitational lensing: strong - submillimeter: diffuse background - submillimeter: galaxies
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