Integrated HI emission in galaxy groups and clusters

doi:10.1088/1674-4527/17/10/101

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	Integrated HI emission in galaxy groups and clusters
	Ai, Mei 1,2,3; Zhu, Ming 1,2; Fu, Jian 4
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2017-09-01
卷号	17 期号:10
关键词	Galaxy Clusters Neutral Hydrogen (Hi) Galaxy Evolution
ISSN号	1674-4527
DOI	10.1088/1674-4527/17/10/101
英文摘要	The integrated HI emission from hierarchical structures such as groups and clusters of galaxies can be detected by FAST at intermediate redshifts. Here we propose to use FAST to study the evolution of the global HI content of clusters and groups over cosmic time by measuring their integrated HI emissions. We use the Virgo Cluster as an example to estimate the detection limit of FAST, and have estimated the integration time to detect a Virgo type cluster at different redshifts (from z = 0.1 to z = 1.5). We have also employed a semi-analytic model (SAM) to simulate the evolution of HI contents in galaxy clusters. Our simulations suggest that the HI mass of a Virgo-like cluster could be 2-3 times higher and the physical size could be more than 50% smaller when redshift increases from z = 0.3 to z = 1. Thus the integration time could be reduced significantly and gas rich clusters at intermediate redshifts can be detected by FAST in less than 2 hours of integration time. For the local Universe, we have also used SAM simulations to create mock catalogs of clusters to predict the outcomes from FAST all sky surveys. Comparing with the optically selected catalogs derived by cross matching the galaxy catalogs from the SDSS survey and the ALFALFA survey, we find that the HI mass distribution of the mock catalog with 20 s of integration time agrees well with that of observations. However, the mock catalog with 120 s of integration time predicts many more groups and clusters that contain a population of low mass HI galaxies not detected by the ALFALFA survey. A future deep HI blind sky survey with FAST would be able to test such prediction and set constraints on the numerical simulation models. The observational strategy and sample selections for future FAST observations of galaxy clusters at high redshifts are also discussed.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000415007500002
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32541]
专题	中国科学院上海天文台
通讯作者	Ai, Mei
作者单位	1.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Ai, Mei,Zhu, Ming,Fu, Jian. Integrated HI emission in galaxy groups and clusters[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(10).
APA	Ai, Mei,Zhu, Ming,&Fu, Jian.(2017).Integrated HI emission in galaxy groups and clusters.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(10).
MLA	Ai, Mei,et al."Integrated HI emission in galaxy groups and clusters".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.10(2017).