Spitzer Deep and Wide Legacy Mid- and Far-Infrared Number Counts and Lower Limits of Cosmic Infrared Background - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Aims: We want to place stronger lower limits on the Cosmic InfraredBackground CIB brightness at 24, 70 and 160 um and measure the extragalacticnumber counts at these wavelengths in an homogeneous way from various surveys.Methods: Using Spitzer legacy data over 53.6 deg^2 of various depths, webuild catalogs with the same extraction method at each wavelength.

. Numbercount uncertainties are estimated with a counts-in-cells moment method, inorder to take into account galaxy clustering. Furthermore, we use a stackinganalysis to estimate number counts of sources not detected at 70 and 160 um



Results: Number counts reach 35 muJy resp. 3.5 mJy and 40 mJy at 24 umresp. 70 and 160um. We reach deeper flux densities of 0.38 mJy at 70 and 3.1at 160 um using a stacking analysis.

.Conclusions: These counts are integrated to estimate new CIB firm lowerlimits of 2.21-0.09+0.09 nW.m^-2.sr^-1 resp. 5.2-0.4+0.4 and 9.0-1.1+1.1nW.m^-2.sr^-1 at 24 um resp. 70 and 160 um, and extrapolated to give newestimates of the CIB due to galaxies of 2.78-0.16+0.18 nW.m^-2.sr^-1 resp.6.4-0.6+0.7 and 14.6-2.9+7.1 nW.m^-2.sr^-1. Products PSF, counts, CIBcontributions, software are publicly available for download atthis http URL



Autor: Matthieu Béthermin, Hervé Dole, Alexandre Beelen, Hervé Aussel

Fuente: https://arxiv.org/







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