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27 April 2024

» arxiv » 1009.2503

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Origins of the extragalactic background at 1mm from a combined analysis of the AzTEC and MAMBO data in GOODS-N
Kyle Penner ; Alexandra Pope ; Edward L. Chapin ; Thomas R. Greve ; Frank Bertoldi ; Mark Brodwin ; Ranga-Ram Chary ; Christopher J. Conselice ; Kristen Coppin ; Mauro Giavalisco ; David H. Hughes ; Rob J. Ivison ; Thushara Perera ; Douglas Scott ; Kimberly Scott ; Grant Wilson ;
Date:	13 Sep 2010
Abstract:	We present a study of the cosmic infrared background, which is a measure of the dust obscured activity in all galaxies in the Universe. We venture to isolate the galaxies responsible for the background at 1mm; with spectroscopic and photometric redshifts we constrain the redshift distribution of these galaxies. We create a deep 1.16mm map (sigma ~ 0.5mJy) by combining the AzTEC 1.1mm and MAMBO 1.2mm datasets in GOODS-N. This combined map contains 41 secure detections, 13 of which are new. By averaging the 1.16mm flux densities of individually undetected galaxies with 24um flux densities > 25uJy, we resolve 31--45 per cent of the 1.16mm background. Repeating our analysis on the SCUBA 850um map, we resolve a higher percentage (40--64 per cent) of the 850um background. A majority of the background resolved (attributed to individual galaxies) at both wavelengths comes from galaxies at z > 1.3. If the ratio of the resolved submillimeter to millimeter background is applied to a reasonable scenario for the origins of the unresolved submillimeter background, 60--88 per cent of the total 1.16mm background comes from galaxies at z > 1.3.
Source:	arXiv, 1009.2503
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