Mass Profile of the Infall Region of the Abell 2199 Supercluster
Mass Profile of the Infall Region of the Abell 2199 Supercluster
复制标题
阿贝尔 2199 超星系团坠落区的质量剖面
DOI：
10.1086/342344
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
G. Wegner
中科院分区：
文献类型：
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作者：
K. Rines;M. Geller;A. Diaferio;A. Mahdavi;J. Mohr;G. Wegner
利用对附近星系团Abell 2199中心95°2区域的1323个星系(1092个新星系或重新测量的星系)的红移观测，我们分析了包含A2199、A2197和一个X射线群的超星系团。焦散技术准确地再现了模拟的简单超星系团的真实质量轮廓(即，一个星系团的维里质量是超星系团中所有其他星系团的维里质量的2-10倍的超星系团)。我们利用档案X射线观测计算了A2197的两个主要成分(A2197W和A2197E)的质量，证明了A2199超星系团很简单(A2199的质量分别是A2197W和A2197E的5倍和12倍)，因此焦散技术应该能给出准确的质量分布。A2199、A2197W和A2197E在R500(封闭密度为临界密度500倍的半径)内的质量分别是1013h-1M⊙的2 2.0倍、3.8倍和1.7倍。质量轮廓在3小时~(-1)MPC内不确定30%，在8小时~(-1)MPC内不确定2倍，对于如此大规模的超星系团来说，这是为数不多的几个∼之一。独立的X射线质量估计在它们重叠的所有半径上都与我们的结果一致。质量分布与等温球的分布非常不一致，但与模拟所建议的分布相吻合。我们讨论了超星团动力学和束缚子团动力学之间的相互作用。Inall质量分布与其他技术之间的一致性表明，焦散技术对于简单的超星系团来说是令人惊讶的健壮的。
Using a redshift survey of 1323 galaxies (1092 new or remeasured) in a region of 95 deg2 centered on the nearby galaxy cluster Abell 2199, we analyze the supercluster containing A2199, A2197, and an X-ray group. The caustic technique accurately reproduces the true mass profiles of simulated simple superclusters (i.e., superclusters for which the virial mass of one cluster is 2–10 times the virial mass of all other clusters in the supercluster). We calculate the masses of the two main components of A2197 (A2197W and A2197E) by using archival X-ray observations and demonstrate that the A2199 supercluster is simple (the mass of A2199 is 5 and 12 times larger than A2197W and A2197E, respectively) and thus that the caustic technique should yield an accurate mass profile. The masses of A2199, A2197W, and A2197E within r500 (the radius within which the enclosed density is 500 times the critical density) are 22.0, 3.8, and 1.7 times 1013 h-1 M⊙, respectively. The mass profile is uncertain by ∼30% within 3 h-1 Mpc and by a factor of 2 within 8 h-1 Mpc and is one of only a few for a supercluster on such large scale. Independent X-ray mass estimates agree with our results at all radii where they overlap. The mass profile strongly disagrees with an isothermal sphere profile but agrees with profiles suggested by simulations. We discuss the interplay of the supercluster dynamics and the dynamics of the bound subclusters. The agreement between the infall mass profile and other techniques shows that the caustic technique is surprisingly robust for simple superclusters.
DOI：
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发表时间：
2010
期刊：
影响因子：
--
作者：
稲田直久;ほか
通讯作者：
ほか