Probing the Missing Baryons via kSZ Stacking

作     者：Han Miao Wei-Peng Lin Peng-Jie Zhang 

作者机构：Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory School of Physics and Astronomy Sun Yat-Sen University Center for Astronomy and Astrophysics Department of Physics and Astronomy Shanghai Jiao Tong University 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第4期

页      面：121-128页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：support by the National Natural Science Foundation of China (Grant Nos. 11473053, 11233005, U1331201 and 11121062) the National Key Basic Research Program of China (Grant No. 2015CB857001) the "Strategic Priority Research Program the Emergence of Cosmological Structures" of the Chinese Academy of Sciences (Grant Nos. XDB09000000 and XDB09010000) 

主　　题：cosmology: theory    large scale structure    kinetic Sunyaev Zel'dovich effect    missingbaryons 

摘      要：Kinetic Sunyaev-Zel＇dovich （kSZ） stacking has great potential to become a powerful probe of missing baryons, due to advances in CMB experiments and galaxy surveys. In this paper, we study kSZ stacking in hydrodynamic simulations with different gastrophysics. We quantify the kSZ stacking signal as a function of halo mass, redshift and projection depth. We compare between different simulations to estimate the impact of gastrophysics such as cooling and supernova feedback. Furthermore, we measure the contribution from warm-hot intergalactic medium （WHIM）, which is believed to be the reservoir for most, if not all, missing baryons. We find that the WHIM contribution is significant, at the level of ~ 10%-70%, depending on the angular separation from the stacked halos and other factors. However, contribution from the intracluster medium along the line of sight is in general non-negligible. This complexity requires more detailed and comprehensive analysis on probing the missing baryons with kSZ stacking.