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arXiv 1912.12840astro-ph.CO
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来自Herschel和Planck卫星的远红外背景各向异性和CMB透镜的互相关

Cross-Correlation of Far-Infrared Background Anisotropies and CMB Lensing from Herschel and Planck satellites

Ye Cao, Yan Gong, Chang Feng, Asantha Cooray, Gong Cheng, Xuelei Chen

摘要:

宇宙红外背景辐射(CIB)各向异性和宇宙微波背景(CMB)透镜效应是研究宇宙学和天体物理问题的有力手段。在这项工作中,我们测量的CIB各向异性的自相关功率谱的赫歇尔-SPIRE赫耳墨斯大模巡天(HeLMS)领域,和交叉功率谱与CMB透镜测量普朗克卫星。HeLMS场的覆盖范围超过270 deg^2,这比之前的分析要大得多。我们使用Herschel Level 1时间流数据合并250、350和500 um波段的CIB图,并屏蔽通量大于3-sigma(~50 mJy/束)或没有测量数据的区域。在考虑光束函数、模式耦合、传递函数等影响的情况下,得到了100<ell<20000的CIB功率谱,并在CIB发射率服从红移高斯分布的假设下,计算了CIB和CMB透镜的理论CIB自功率谱和互功率谱。我们发现,对于CIB自动功率谱,我们获得的信噪比(SNR)为15.9,15.7,和15.3在250,350,和500 μ m,和CIBxCMB透镜功率谱,SNR为7.5,7.0,和6.2在250,350,和500 μ m,分别。与以往的研究相比,本研究中对相关CIB参数的约束条件提高了2~5倍。

英文摘要:

The cosmic infrared background (CIB) anisotropies and cosmic microwave background (CMB) lensing are powerful measurements for exploring the cosmological and astrophysical problems. In this work, we measure the auto-correlation power spectrum of the CIB anisotropies in the Herschel-SPIRE HerMES Large Mode Survey (HeLMS) field, and the cross power spectrum with the CMB lensing measurements from the Planck satellite. The HeLMS field covers more than 270 deg^2, which is much larger than the previous analysis. We use the Herschel Level 1 time stream data to merge the CIB maps at 250, 350, and 500 um bands, and mask the areas where the flux is greater than 3-sigma (~50 mJy/beam) or no measured data. We obtain the final CIB power spectra at 100<ell<20000 by considering several effects, such as beam function, mode coupling, transfer function, and so on. We also calculate the theoretical CIB auto- and cross-power spectra of CIB and CMB lensing by assuming that the CIB emissivity follows Gaussian distribution in redshift. We find that, for the CIB auto power spectra, we obtain the signal to noise ratio (SNR) of 15.9, 15.7, and 15.3 at 250, 350, and 500 um, and for the CIBxCMB lensing power spectra, SNR of 7.5, 7.0, and 6.2 at 250, 350, and 500 um, respectively. Comparing to previous works, the constraints on the relevant CIB parameters are improved by factors of 2~5 in this study.

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