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BLAST: resolving the cosmic submillimeter background

Marsden, Gaelen, Ade, Peter A. R., Bock, James J., Chapin, Edward L., Devlin, Mark J., Dicker, Simon R., Griffin, Matthew Joseph, Gundersen, Joshua O., Halpern, Mark, Hargrave, Peter Charles, Hughes, David H., Klein, Jeff, Mauskopf, Philip Daniel, Magnelli, Benjamin, Moncelsi, Lorenzo, Netterfield, Calvin B., Ngo, Henry, Olmi, Luca, Pascale, Enzo, Patanchon, Guillaume, Rex, Marie, Scott, Douglas, Semisch, Christopher, Thomas, Nicholas, Truch, Matthew D. P., Tucker, Carole Elizabeth, Tucker, Gregory S., Viero, Marco P. and Wiebe, Donald V. 2009. BLAST: resolving the cosmic submillimeter background. Astrophysical Journal 707 (2) , pp. 1729-1739. 10.1088/0004-637X/707/2/1729

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Abstract

The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) has made 1 deg2, deep, confusion-limited maps at three different bands, centered on the Great Observatories Origins Deep Survey South Field. By calculating the covariance of these maps with catalogs of 24 μm sources from the Far-Infrared Deep Extragalactic Legacy Survey, we have determined that the total submillimeter intensities are 8.60 ± 0.59, 4.93 ± 0.34, and 2.27 ± 0.20 nW m–2 sr–1 at 250, 350, and 500 μm, respectively. These numbers are more precise than previous estimates of the cosmic infrared background (CIB) and are consistent with 24 μm-selected galaxies generating the full intensity of the CIB. We find that the fraction of the CIB that originates from sources at z ≥ 1.2 increases with wavelength, with 60% from high-redshift sources at 500 μm. At all BLAST wavelengths, the relative intensity of high-z sources is higher for 24 μm-faint sources than that for 24 μm-bright sources. Galaxies identified as active galactic nuclei (AGNs) by their Infrared Array Camera colors are 1.6-2.6 times brighter than the average population at 250-500 μm, consistent with what is found for X-ray-selected AGNs. BzK-selected galaxies are found to be moderately brighter than typical 24 μm-selected galaxies in the BLAST bands. These data provide high-precision constraints for models of the evolution of the number density and intensity of star-forming galaxies at high redshift.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: cosmology: observations; diffuse radiation; galaxies: evolution; galaxies: starburst; submillimeter
Publisher: American Astronomical Society
ISSN: 0004-637X
Last Modified: 02 Jun 2019 22:46
URI: http://orca.cf.ac.uk/id/eprint/7306

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