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arXiv 0910.5219astro-ph.CO
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COSMOS巡天X射线群的弱透镜研究:质量-光度关系的形成和演化

A Weak Lensing Study of X-ray Groups in the COSMOS survey: Form and Evolution of the Mass-Luminosity Relation

A. Leauthaud, A. Finoguenov, J. P. Kneib, J. E. Taylor, R. Massey, J. Rhodes, O. Ilbert, K. Bundy, J. Tinker, M. R. George, P. Capak, A. M. Koekemoer, D. E. Joh… 展开作者

A. Leauthaud, A. Finoguenov, J. P. Kneib, J. E. Taylor, R. Massey, J. Rhodes, O. Ilbert, K. Bundy, J. Tinker, M. R. George, P. Capak, A. M. Koekemoer, D. E. Johnston, Y. Y. Zhang, N. Cappelluti, R. S. Ellis, M. Elvis, C. Heymans, O. Le Fevre, S. Lilly, H. J. McCraken, Y. Mellier, A. Refregier, M. Salvato, N. Scoville, G. Smoot, M. Tanaka, L. Van Waerbeke, M. Wolk

摘要:

X射线标度律的测量对于改进由晕质量函数导出的宇宙学约束和理解控制团内介质加热和冷却的物理过程是至关重要的。本文用206个X射线星系群的样本研究了X射线光度(Lx)与晕质量(M00)之间的标度关系,其中M200是由弱引力透镜叠加得到的。这项工作借鉴了广泛的多波长COSMOS观测,包括1.64平方度的连续成像与高级相机的调查(ACS)和深XMM牛顿/钱德拉成像。这两个数据集的组合深度使我们能够探测X射线检测到的结构在更高的红移和更低的质量比以前探索的透镜信号。弱透镜配置文件和晕群众派生的九个子样本,窄分仓的光度和红移。仅COSMOS的数据就能很好地符合幂律M200 ~ Lx^a,斜率为a=0.66+-0.14。这些结果显着扩展的动态范围内的晕质量的X射线选定的结构已被测量与弱引力透镜。结果,得到了M-Lx关系的斜率的严格约束。我们的群数据与先前发表的星系团数据相结合表明,M-Lx关系可以很好地用一个单一的幂律来描述,即a=0.64+-0.03,在20年的时间里,质量为10^13.5-10^15.5 h72^-1 Msun。这些结果在3.7水平上与a=0.75的自相似预测不一致。我们研究的红移依赖的M-Lx关系,并发现几乎没有证据的演化速度超出了预测的自相似性从z ~ 0.25到z ~ 0.8。

英文摘要:

Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we use a sample of 206 X-ray selected galaxy groups to investigate the scaling relation between X-ray luminosity (Lx) and halo mass (M00) where M200 is derived via stacked weak gravitational lensing. This work draws upon a broad array of multi-wavelength COSMOS observations including 1.64 square degrees of contiguous imaging with the Advanced Camera for Surveys (ACS) and deep XMM-Newton/Chandra imaging. The combined depth of these two data-sets allows us to probe the lensing signals of X-ray detected structures at both higher redshifts and lower masses than previously explored. Weak lensing profiles and halo masses are derived for nine sub-samples, narrowly binned in luminosity and redshift. The COSMOS data alone are well fit by a power law, M200 ~ Lx^a, with a slope of a=0.66+-0.14. These results significantly extend the dynamic range for which the halo masses of X-ray selected structures have been measured with weak gravitational lensing. As a result, tight constraints are obtained for the slope of the M-Lx relation. The combination of our group data with previously published cluster data demonstrates that the M-Lx relation is well described by a single power law, a=0.64+-0.03, over two decades in mass, 10^13.5-10^15.5 h72^-1 Msun. These results are inconsistent at the 3.7 level with the self-similar prediction of a=0.75. We examine the redshift dependence of the M-Lx relation and find little evidence for evolution beyond the rate predicted by self-similarity from z ~ 0.25 to z ~ 0.8.

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