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RCS2 J232727 .6-020437,a ~ 3 × 10 $^{15}$ M $_{\odot}$星系团在z=0.7时的多波长质量分析

A Multi-Wavelength Mass Analysis of RCS2 J232727.6-020437, a ~3x10$^{15}$M$_{\odot}$ Galaxy Cluster at z=0.7

K. Sharon, M. D. Gladders, D. P. Marrone, H. Hoekstra, E. Rasia, H. Bourdin, D. Gifford, A. K. Hicks, C. Greer, T. Mroczkowski, L. F. Barrientos, M. Bayliss, J.… 展开作者

K. Sharon, M. D. Gladders, D. P. Marrone, H. Hoekstra, E. Rasia, H. Bourdin, D. Gifford, A. K. Hicks, C. Greer, T. Mroczkowski, L. F. Barrientos, M. Bayliss, J. E. Carlstrom, D. G. Gilbank, M. Gralla, J. Hlavacek-Larrondo, E. Leitch, P. Mazzotta, C. Miller, S. J. C. Muchovej, T. Schrabback, H. K. C. Yee

摘要:

我们提出了一个大规模的和遥远的集群,RCS 2 J232727.6-020437的质量和演化状态的初步研究。这个星系团的z=0.6986,是RCS 2项目中发现的最丰富的星系团。本文给出的质量测量是由所有可能的质量代用指标:X射线测量、弱透镜剪切、强透镜、Sunyaev Zel'dovich效应减量、星系团成员星系的速度分布和星系丰富度导出的。虽然每个观测值都探测了不同半径的星团质量,但它们都表明RCS 2 J232727.6-020437是这个红移处质量最大的星团之一,估计质量为M_200 ~3 x10^15 h^-1 Msun。在本文中,我们证明了各种观测量都是合理的相互一致的不确定性。RCS 2 J232727.6-020437看起来很放松-具有圆形和同心的X射线等照度线,具有冷却的核心,并且在广泛的星系速度数据中没有显着的子结构。

英文摘要:

We present an initial study of the mass and evolutionary state of a massive and distant cluster, RCS2 J232727.6-020437. This cluster, at z=0.6986, is the richest cluster discovered in the RCS2 project. The mass measurements presented in this paper are derived from all possible mass proxies: X-ray measurements, weak-lensing shear, strong lensing, Sunyaev Zel'dovich effect decrement, the velocity distribution of cluster member galaxies, and galaxy richness. While each of these observables probe the mass of the cluster at a different radius, they all indicate that RCS2 J232727.6-020437 is among the most massive clusters at this redshift, with an estimated mass of M_200 ~3 x10^15 h^-1 Msun. In this paper, we demonstrate that the various observables are all reasonably consistent with each other to within their uncertainties. RCS2 J232727.6-020437 appears to be well relaxed -- with circular and concentric X-ray isophotes, with a cool core, and no indication of significant substructure in extensive galaxy velocity data.

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