论文标题
群内散射和从TSZ效应中使用宇宙红外背景的相对论校正的重要性
Importance of intracluster scattering and relativistic corrections from tSZ effect with Cosmic Infrared Background
论文作者
论文摘要
Sunyaev-Zeldovich对星系簇的效应已成为宇宙学的标准探针。它是由热簇电子气体从宇宙微波背景（CMB）散射的。以类似的方式，通过簇介质可以散布其他光子背景。最近已经考虑了无线电和宇宙红外背景的问题。在这里，我们重新审视了宇宙红外背景（CIB）的讨论，包括之前省略的其他效果。我们讨论了CIB的{\ it Intracuster}散射，以及{\ IT相对论}温度校正对单个群集和全套平均信号的作用。我们表明，由于忽略了簇内的散射贡献，光子场的散射引起的全天鹅ciB失真被低估了$ \ simeq 1.5 $。能量本质上是从热电子到CIB的两次。我们在计算平均CIB和散射信号的计算中仔细阐明了各种效应的起源。单簇CIB散射信号还表现出明显的红移依赖性，可以在宇宙学分析中使用，正如我们在分析和数值上描述的那样。这可能会通过未来的CMB实验为宇宙学研究打开一种新的方式。
The Sunyaev-Zeldovich effect towards clusters of galaxies has become a standard probe of cosmology. It is caused by the scattering of photons from the cosmic microwave background (CMB) by the hot cluster electron gas. In a similar manner, other photon backgrounds can be scattered when passing through the cluster medium. This problem has been recently considered for the radio and the cosmic infrared background. Here we revisit the discussion of the cosmic infrared background (CIB) including several additional effects that were omitted before. We discuss the {\it intracluster} scattering of the CIB and the role of {\it relativistic} temperature corrections to the individual cluster and all-sky averaged signals. We show that the all-sky CIB distortion introduced by the scattering of the photon field was underestimated by a factor of $\simeq 1.5$ due to neglecting the intracluster scattering contribution. Energy is essentially transferred twice from the thermal electrons to the CIB. We carefully clarify the origin of various effects in the calculation of the average CIB and also scattered signals. The single-cluster CIB scattering signal also exhibits a clear redshift dependence, which can be used in cosmological analyses, as we describe both analytically and numerically. This may open a new way for cosmological studies with future CMB experiments.
