The kinetic Sunyaev-Zel'dovich tomography - II. Probing the circumgalactic medium

doi:10.1093/mnras/stw501

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	The kinetic Sunyaev-Zel'dovich tomography - II. Probing the circumgalactic medium
	Shao, Jiawei 2; Fang, Taotao 1,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2016-06-01
卷号	458 期号:4 页码:3773-3785
关键词	Methods: Statistical Intergalactic Medium Cosmic Background Background Cosmology: Theory
ISSN号	0035-8711
DOI	10.1093/mnras/stw501
英文摘要	We propose the use of the kinetic Sunyaev-Zel'dovich (kSZ) effect to probe the circumgalactic medium (CGM), with the aid of a spectroscopic survey covering the same area of a SZ survey. It is possible to design an optimal estimator of the kSZ effect of the CGM with a matched filter, and to construct the cross-correlation between the estimator and the peculiar velocity recovered from the galaxy survey, which can be measured by stacking a number of galaxies. We investigate two compelling profiles for the CGM - the Maller-Bullock (MB) profile and the beta profile - and we estimate the detectability against the synergy of a fiducial galaxy survey with number density 10(-3) h(3) Mpc (3) and an Atacama Cosmology Telescope-like SZ survey. We show that the shape of the filter does not change much with redshift for the beta profile, while there are significant side lobes at z < 0.1 for the MB profile. By stacking similar to 10(4) Milky Way-size haloes around z similar to 0.5, we can obtain greater than or similar to 1 sigma signal-to-noise ratio (S/N) for both profiles. The S/N increases with decreasing redshift before it reaches a maximum (similar to 7.5 at z similar or equal to 0.12 for the MB profile and similar to 19 at z similar or equal to 0.03 for the beta profile). Because of the large beam size, a Planck-like cosmic microwave background survey can marginally detect the kSZ signal by stacking the same number of galaxies at z < 0.1. The search for the CGM in realistic surveys will involve dividing the galaxies into subsamples with similar redshift and mass of host haloes, and scaling the results presented here to obtain the S/N.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000375799500033
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32823]
专题	中国科学院上海天文台
通讯作者	Shao, Jiawei
作者单位	1.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 3.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
推荐引用方式 GB/T 7714	Shao, Jiawei,Fang, Taotao. The kinetic Sunyaev-Zel'dovich tomography - II. Probing the circumgalactic medium[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,458(4):3773-3785.
APA	Shao, Jiawei,&Fang, Taotao.(2016).The kinetic Sunyaev-Zel'dovich tomography - II. Probing the circumgalactic medium.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,458(4),3773-3785.
MLA	Shao, Jiawei,et al."The kinetic Sunyaev-Zel'dovich tomography - II. Probing the circumgalactic medium".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458.4(2016):3773-3785.