Abstract Details
| Name: Priyanka Singh Affiliation: Raman Research Institute Conference ID: ASI2015_529 Title : CMB distortion from circumgalactic gas Authors and Co-Authors : Subhabrata Majumdar, TIFR, Mumbai. Biman B. Nath, RRI, Bangalore. Joseph Silk, Institut d' Astrophysique, 75014Paris, France & The Hopkins University, USA Abstract Type : Oral Abstract Category : General Relativity and Cosmology Abstract : We study the Sunyaev-Zel'dovich (SZ) distortion of the cosmic microwave background radiation (CMBR) from extensive circum-galactic gas (CMG) in massive galactic halos. Recent observations have shown that galactic halos contain a large amount of X-ray emitting gas at virial temperature. We consider SZ distortion from the hot gas in those galactic halos in which the gas cooling timescale larger than the halo destruction timescale. We show that the SZ distortion signal from the hot gas in these galactic halos at redshifts z ~ 1-8 can be significant at small angular scales l ~ 10^4, and dominate over the signal from galaxy clusters. We also compute the stacked thermal SZ signal from CGM which is the cross-correlation power spectrum between the SZ effect and the distribution of galactic-halos and discuss the detectability of stacked SZ signal by combining SPT observation and optical surveys. |