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arXiv 1007.3193astro-ph.CO
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普朗克SZ星团表:预期的X射线性质

The Planck SZ Cluster Catalog: Expected X-ray Properties

A. Chamballu, J. G. Bartlett, J. -B. Melin

摘要:

基于Sunyaev-Zel'dovich(SZ)效应的巡天观测提供了星系团人口的新视角,这是对X射线巡天观测的补充。为了更好地理解这两种调查之间的关系,我们构建了一个经验集群模型,使用当前X射线和SZ数据约束的标度关系。我们应用我们的模型预测的X射线性质的普朗克SZ星系团目录(PCC),并比较它们与现有的X射线星系团目录。我们发现,普朗克应该显着扩展的深度,以前的全天星团调查,在20世纪90年代初进行的ROSAT卫星,应该是特别有效的发现热,大质量的集群(T > 6千电子伏)的红移单位。这些都是罕见的物体,我们的发现表明普朗克可以将z > 0.6的观测样本增加一个数量级。这将为深入研究这些更高红移的大质量星系团开辟道路。特别地,我们发现大多数新探测到的普朗克星系团应该具有X射线通量10^{-13}尔格/s/cm ^2 < f_X[0.5-2 keV] < 10^{-12}尔格/s/cm ^2,即,在过去十年中,其通量分布略低于ROSAT全天巡天的极限。这对于广泛的X射线后续活动来说是足够亮的。一旦普朗克发现了这些天体,XMM-牛顿和\textit{Chandra}就可以在0.5 < z < 1的范围内测量到100个星团样本的10%的温度,这是在这个范围内研究的大质量星团数量的宝贵增加。

英文摘要:

Surveys based on the Sunyaev-Zel'dovich (SZ) effect provide a fresh view of the galaxy cluster population, one that is complementary to X-ray surveys. To better understand the relation between these two kinds of survey, we construct an empirical cluster model using scaling relations constrained by current X-ray and SZ data. We apply our model to predict the X-ray properties of the Planck SZ Cluster Catalog (PCC) and compare them to existing X-ray cluster catalogs. We find that Planck should significantly extend the depth of the previous all-sky cluster survey, performed in the early 1990s by the ROSAT satellite, and should be particularly effective at finding hot, massive clusters (T > 6 keV) out to redshift unity. These are rare objects, and our findings suggest that Planck could increase the observational sample at z > 0.6 by an order of magnitude. This would open the way for detailed studies of massive clusters out to these higher redshifts. Specifically, we find that the majority of newly-detected Planck clusters should have X-ray fluxes 10^{-13} ergs/s/cm^2 < f_X[0.5-2 keV] < 10^{-12} ergs/s/cm^2, i.e., distributed over the decade in flux just below the ROSAT All Sky Survey limit. This is sufficiently bright for extensive X-ray follow-up campaigns. Once Planck finds these objects, XMM-Newton and \textit{Chandra} could measure temperatures to 10% for a sample of ~ 100 clusters in the range 0.5 < z < 1, a valuable increase in the number of massive clusters studied over this range.

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