LoCuSS: A COMPARISON OF SUNYAEV–ZEL'DOVICH EFFECT AND GRAVITATIONAL-LENSING MEASUREMENTS OF GALAXY CLUSTERS
LoCuSS: A COMPARISON OF SUNYAEV–ZEL'DOVICH EFFECT AND GRAVITATIONAL-LENSING MEASUREMENTS OF GALAXY CLUSTERS
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LoCuSS：SUNYAEV-ZELDOVICH 效应与星系团引力透镜测量的比较
DOI：
10.1088/0004-637x/701/2/l114
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Woody
中科院分区：
文献类型：
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作者：
D. Marrone;Graham P. Smith;J. Richard;M. Joy;M. Bonamente;N. Hasler;V. Hamilton;J. Kneib;T. Culverhouse;J. Carlstrom;C. Greer;D. Hawkins;R. Hennessy;J. Lamb;E. Leitch;M. Loh;Amber D. Miller;T. Mroczkowski;S. Muchovej;C. Pryke;M. Sharp;D. Woody
我们提出了第一次测量的Sunyaev-Zel'dovich效应（SZE）的信号和星系团的质量之间的关系，使用引力透镜测量集群质量，基于14个X射线发光集群在z = 0.2从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（MGL）内的一个投影的集群中心半径为350千秒差距，对应的平均超密度为4000-8000相对于临界密度。我们发现MGL和Y之间的自相似标度，在固定的Y为32%的质量分散。这种散射超过了从数值集群模拟预测，但是，它是小于可比测量的散射质量在固定的TX。我们也没有发现任何证据的隔离在Y之间的干扰和未受干扰的集群，已经看到与TX在相同的物理尺度。我们将我们的标度关系与Bonamente等人基于假设流体静力学平衡的质量测量的关系进行了比较，没有发现星团核心中流体静力学质量偏差的证据（MGL = 0.98 ± 0.13 MHSE），这与数值模拟和基于透镜/X射线的测量在较大半径处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，SZE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。
We present the first measurement of the relationship between the Sunyaev–Zel'dovich effect (SZE) 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 (MGL) 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 MGL 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 TX. We also find no evidence of segregation in Y between disturbed and undisturbed clusters, as had been seen with TX 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 (MGL = 0.98 ± 0.13 MHSE), 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 SZE may be less sensitive than X-ray observations to the details of cluster physics in cluster cores.