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arXiv 1001.0896astro-ph.CO
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斯皮策深宽遗产中红外和远红外数计数和宇宙红外背景下限

Spitzer Deep and Wide Legacy Mid- and Far-Infrared Number Counts and Lower Limits of Cosmic Infrared Background

Matthieu Béthermin, Hervé Dole, Alexandre Beelen, Hervé Aussel

摘要:

目的:我们希望在24,70和160 um的宇宙红外背景(CIB)亮度上设置更强的下限,并以均匀的方式从各种调查中测量这些波长的河外星系数计数。方法:使用斯皮策遗留数据超过53.6 deg^2的不同深度,我们建立目录在每个波长相同的提取方法。[...]计数的不确定性估计与细胞计数矩方法,以考虑到星系聚类。此外,我们使用堆叠分析来估计在70和160微米处未检测到的源的数量计数。[...]结果:数量计数达到35 μ Jy(分别为100 μ Jy和100 μ Jy)。3.5 mJy和40 mJy)在24 μ m(分别70和160um)。我们达到更深的通量密度为0.38毫焦耳在70和3.1在160微米使用堆叠分析。[...]结论:将这些计数进行积分,以估计新的CIB确定下限为2.21 - 0.09 + 0.09 nW. m ^-2.sr ^-1(分别为2.21 - 0.09 + 0.09 nW. m ^-2.sr ^-1)。5.2 - 0.4 + 0.4和9.0 - 1.1 + 1.1 nW. m ^-2.sr ^-1)(分别为70和160 μ m),并外推得出星系CIB的新估计值为2.78 - 0.16 + 0.18 nW. m ^-2.sr ^-1(分别为2.78 - 0.16 + 0.18 nW. 6.4 - 0.6 + 0.7和14.6 - 2.9 + 7.1 nW. m ^-2.sr ^-1)。产品(PSF、计数、CIB贡献、软件)可在www.example.com公开下载

英文摘要:

Aims: We want to place stronger lower limits on the Cosmic Infrared Background (CIB) brightness at 24, 70 and 160 um and measure the extragalactic number counts at these wavelengths in an homogeneous way from various surveys. Methods: Using Spitzer legacy data over 53.6 deg^2 of various depths, we build catalogs with the same extraction method at each wavelength. [...] Number count uncertainties are estimated with a counts-in-cells moment method, in order to take into account galaxy clustering. Furthermore, we use a stacking analysis 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 um (resp. 70 and 160um). We reach deeper flux densities of 0.38 mJy at 70 and 3.1 at 160 um using a stacking analysis. [...] Conclusions: These counts are integrated to estimate new CIB firm lower limits of 2.21-0.09+0.09 nW.m^-2.sr^-1 (resp. 5.2-0.4+0.4 and 9.0-1.1+1.1 nW.m^-2.sr^-1) at 24 um (resp. 70 and 160 um), and extrapolated to give new estimates 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, CIB contributions, software) are publicly available for download at http://www.ias.u-psud.fr/irgalaxies/

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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