POWER-LAW TEMPLATE FOR INFRARED POINT-SOURCE CLUSTERING

• Published in: The Astrophysical journal Vol. 752; no. 2; pp. 1 - 9
• Main Authors: ADDISON, Graeme E, DUNKLEY, Joanna, MARRIAGE, Tobias A, MOODLEY, Kavilan, PAGE, Lyman A, REESE, Erik D, SCOTT, Douglas, SPERGEL, David N, STAGGS, Suzanne T, WOLLACK, Edward, HAJIAN, Amir, VIERO, Marco, BOND, J. Richard, DAS, Sudeep, DEVLIN, Mark J, HALPERN, Mark, HINCKS, Adam D, HLOZEK, Renée
• Format: Journal Article
• Language: English
• Published: Bristol IOP 20-06-2012
• Subjects: AMPLITUDES; ANISOTROPY; ASTRONOMY; ASTROPHYSICS; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BACKGROUND RADIATION; Clustering; COSMIC DUST; Cosmic microwave background; COSMOLOGY; Dust; Earth, ocean, space; EMISSION SPECTRA; EMISSIVITY; ENERGY SPECTRA; Exact sciences and technology; FREQUENCY DEPENDENCE; GALAXIES; GHZ RANGE; INDEXES; Infrared; INFRARED SPECTRA; Mathematical models; Planck satellite; POINT SOURCES; RED SHIFT; RELICT RADIATION; STAR CLUSTERS; Telescopes; Antarctica, South Pole; Blackbody; Frequency dependence; Red shift; infrared: galaxies; Power spectra; Cosmic background radiation; Effective temperature; Linear model; Point sources; infrared: diffuse background; Anisotropy; Planck satellite; Cosmology; Infrared galaxies; Spectral index; cosmology: observations; Power law; submillimeter: diffuse background
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1088/0004-637x/752/2/120

We perform a combined fit to angular power spectra of unresolved infrared (IR) point sources from the Planck satellite (at 217, 353, 545, and 857 GHz, over angular scales 100 [lap]l[lap] 2200), the Balloon-borne Large-Aperture Submillimeter Telescope (BLAST; 250, 350, and 500 mu m; 1000 [lap]l[lap] 9000), and from correlating BLAST and Atacama Cosmology Telescope (ACT; 148 and 218 GHz) maps. We find that the clustered power over the range of angular scales and frequencies considered is well fitted by a simple power law of the form C super(clust) super(l) alpha l super(-n) with n = 1.25 + or - 0.06. While the IR sources are understood to lie at a range of redshifts, with a variety of dust properties, we find that the frequency dependence of the clustering power can be described by the square of a modified blackbody, v super( beta )B(v, T sub(eff)), with a single emissivity index beta = 2.20 + or - 0.07 and effective temperature T sub(eff) = 9.7 K. Our predictions for the clustering amplitude are consistent with existing ACT and South Pole Telescope results at around 150 and 220 GHz, as is our prediction for the effective dust spectral index, which we find to be alpha sub(150-220) = 3.68 + or - 0.07 between 150 and 220 GHz. Our constraints on the clustering shape and frequency dependence can be used to model the IR clustering as a contaminant in cosmic microwave background anisotropy measurements. The combined Planck and BLAST data also rule out a linear bias clustering model.