Importance of intracluster scattering and relativistic corrections from tSZ effect with cosmic infrared background

ABSTRACT The Sunyaev–Zeldovich effect towards clusters of galaxies has become a standard probe cosmology. It is caused by the scattering photons from cosmic microwave background (CMB) hot cluster electron gas. In similar manner, other photon backgrounds can be scattered when passing through medium. This problem been recently considered for radio and infrared background. Here, we revisit discussion (CIB) including several additional effects that were omitted before. We discuss intracluster CIB role relativistic temperature corrections to individual all-sky averaged signals. show distortion introduced field was underestimated factor ?1.5 due neglecting contribution. scatter with thermal electrons both parent halo or another halo, meaning there are two ways gain energy. Therefore, energy essentially transferred twice CIB. carefully clarify origin various in calculation average also single-cluster signal exhibits clear redshift dependence, which used cosmological analyses, as describe analytically numerically. may open new way studies future CMB experiments.