| Resolved SZE Cluster Count |
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| 作者姓名： | Jia-Yu Tang and Zu-Hui Fan |
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| 作者单位： | Jia-Yu Tang and Zu-Hui Fan
Department of Astronomy，Peking University，Beijing 100871; tangjy@vega.bac.pku.edu.cn
Chinese Academy of Sciences-Peking University Joint Beijing Astrophysics Center，Beijing 100871 |
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| 摘 要： | We study the counts of resolved SZE(Sunyaev-Zel‘dovich effect)clusters expected from an interferometric survey in different cosmological models under different conditions.The self-similar universal gas model and Press-Schechter mass function are used.We take the observing frequency to be 90GHz,and consider two dish diameters,1.2m and 2.5m.We calculate the number density of the galaxy clusters dN/(dΩdz)at a high flux limit Sv^lim=100mJy and at a relative low Sv^lim=10mJy.The total numbers of SZE clusters N in two low-Ω0 models are compared.The results show that the inθuence of the resolved effect depends not only on D,but also on Sv^lim;at a given D,the effect is more significant for a high than for a low Sv^lim.Also,the resolved effect for a flat universe is more impressive than tnat for an open universe.ForD=1.2m and Sv^lim=10mJy,the resolved effect is very weak.Considering the designed interferometers which will be used to survey SZE clusters,we find that the resolved effect is insignificant when estimating the expected yield of the SZE cluster surveys.
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| 关 键 词： | 干涉测量 宇宙模型 星系 SZE星族 观测频率 数量 宇宙结构 |
Resolved SZE Cluster Count |
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| Jia-Yu Tang and Zu-Hui Fan.Resolved SZE Cluster Count[J].Chinese Journal of Astronomy and Astrophysics,2003,3(3):191-202. |
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| Authors: | Jia-Yu Tang Zu-Hui Fan |
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| Institution: | [1]DepartmentofAstronomy,PekingUniversity,Beijing100871 [2]ChineseAcademyofSciences-PekingUniversityJointBeijingAstrophysicsCenter,Beijing100871 |
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| Abstract: | We study the counts of resolved SZE (Sunyaev-Zel'dovich effect) clusters expected from an interferometric survey in different cosmological models under different conditions. The self-similar universal gas model and Press-Schechter mass function are used. We take the observing frequency to be 90 GHz, and consider two dish diameters, 1.2m and 2.5m. We calculate the number density of the galaxy clusters dN/(ddz) at a high flux limit Slim- 100 mJy and at a relative low Slim =10mJy. The total numbers of SZE clusters N in two low-0 models are compared. The results show that the influence of the resolved effect depends not only on D, but also on Slim: at a given D, the effect is more significant for a high than for a low Slim. Also, the resolved effect for a flat universe is more impressive than that for an open universe. For D - 1.2m and Slim = 10mJy, the resolved effect is very weak. Considering the designed interferometers which will be used to survey SZE clusters, we find that the resolved effect is insignificant when estimating the expected yield of the SZE cluster surveys. |
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| Keywords: | cosmology: theory - galaxy: cluster: general -large-scale structure of universe |
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