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arXiv 0907.1687astro-ph.CO
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LoCuSS:星系团的Sunyaev-Zel'dovich效应和引力透镜测量的比较

LoCuSS: A Comparison of Sunyaev-Zel'dovich Effect and Gravitational Lensing Measurements of Galaxy Clusters

Daniel P. Marrone, Graham P. Smith, Johan Richard, Marshall Joy, Massimiliano Bonamente, Nicole Hasler, Victoria Hamilton-Morris, Jean-Paul Kneib, Thomas Culver… 展开作者

Daniel P. Marrone, Graham P. Smith, Johan Richard, Marshall Joy, Massimiliano Bonamente, Nicole Hasler, Victoria Hamilton-Morris, Jean-Paul Kneib, Thomas Culverhouse, John E. Carlstrom, Christopher Greer, David Hawkins, Ryan Hennessy, James W. Lamb, Erik M. Leitch, Michael Loh, Amber Miller, Tony Mroczkowski, Stephen Muchovej, Clem Pryke, Matthew K. Sharp, David Woody

摘要:

我们提出了第一次测量的Sunyaev-Zel'dovich效应信号和质量之间的关系的星系团,使用引力透镜来测量集群质量,基于14个X射线发光集群在z~0.2的本地集群子结构调查。我们测量的综合康普顿y参数,Y,和总投影质量的集群(M_GL)内的投影集群中心半径为350 kpc,对应的平均过密度为4000-8000相对于临界密度。我们发现M_GL和Y之间的自相似标度,在固定的Y为32%的质量分散。这种散射超过了数值模拟的结果,但小于固定T_X时质量散射的可比测量值。我们也没有发现在Y中扰动和未扰动星系团之间的分离的证据,就像在相同的物理尺度上观察到的T_X一样。我们将我们的标度关系与Bonamente等人基于假设流体静力平衡的质量测量的关系进行比较,发现没有证据表明星团核心中存在流体静力质量偏差(M_GL = 0.98+/-0.13 M_HSE),这与数值模拟和基于透镜/X射线的测量在较大半径下的质量可观测标度关系的预测一致。总的来说,我们的研究结果表明,Sunyaev-Zel'dovich效应可能是不太敏感的比X射线观测到的集群物理的细节在集群核心。

英文摘要:

We present the first measurement of the relationship between the Sunyaev-Zel'dovich effect signal and the mass of galaxy clusters that uses gravitational lensing to measure cluster mass, based on 14 X-ray luminous clusters at z~0.2 from the Local Cluster Substructure Survey. We measure the integrated Compton y-parameter, Y, and total projected mass of the clusters (M_GL) within a projected clustercentric radius of 350 kpc, corresponding to mean overdensities of 4000-8000 relative to the critical density. We find self-similar scaling between M_GL and Y, with a scatter in mass at fixed Y of 32%. This scatter exceeds that predicted from numerical cluster simulations, however, it is smaller than comparable measurements of the scatter in mass at fixed T_X. We also find no evidence of segregation in Y between disturbed and undisturbed clusters, as had been seen with T_X on the same physical scales. We compare our scaling relation to the Bonamente et al. relation based on mass measurements that assume hydrostatic equilibrium, finding no evidence for a hydrostatic mass bias in cluster cores (M_GL = 0.98+/-0.13 M_HSE), consistent with both predictions from numerical simulations and lensing/X-ray-based measurements of mass-observable scaling relations at larger radii. Overall our results suggest that the Sunyaev-Zel'dovich effect may be less sensitive than X-ray observations to the details of cluster physics in cluster cores.

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