arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1609.00375astro-ph.CO
收藏

星系团X射线形貌的X射线-SZ差检验和红移演化

Testing for X-ray-SZ Differences and Redshift Evolution in the X-ray Morphology of Galaxy Clusters

D. Nurgaliev, M. McDonald, B. A. Benson, L. Bleem, S. Bocquet, W. R. Forman, G. P. Garmire, N. Gupta, J. Hlavacek-Larrondo, J. J. Mohr, D. Nagai, D. Rapetti, A.… 展开作者

D. Nurgaliev, M. McDonald, B. A. Benson, L. Bleem, S. Bocquet, W. R. Forman, G. P. Garmire, N. Gupta, J. Hlavacek-Larrondo, J. J. Mohr, D. Nagai, D. Rapetti, A. A. Stark, C. W. Stubbs, A. Vikhlinin

摘要:

我们提出了一个定量研究的X射线形态的星系团,作为其功能的检测方法和红移。我们分析了两个独立的星系团的样本:一个是在ROSAT PSPC 400 deg 2巡天的X射线中选择的0.35 < z < 0.9的36个星系团的样本,另一个是通过南极望远镜的Sunyaev-Zel'dovich(SZ)效应选择的0.25 < z < 1.2的90个星系团的样本。来自两个样本的集群具有相似质量的钱德拉观测结果,这使我们能够通过两种不同的方法量化它们的X射线形态:质心位移和光子不对称性。后一种技术提供了几乎无偏的形态估计跨越广泛的红移和数据质量的集群。我们进一步比较了X射线和SZ选择的团簇与模拟团簇的X射线形貌。我们没有发现一个统计学上的显着差异,在测量的X射线形态的X射线和SZ选择的集群探测这些样品的红移范围,这表明这两个探测类似的群体集群。我们发现,模拟集群的X射线形态是统计上无法区分的X射线或SZ选择的集群,这意味着最重要的物理支配的大规模的气体形态(核心外)是很好的近似在这些模拟。最后,我们发现在z ~ 0.3到z ~ 1的范围内,X射线形态(观测和模拟的星系团)没有统计上显著的红移演化,似乎与模拟预测的红移依赖的晕合并率相矛盾。

英文摘要:

We present a quantitative study of the X-ray morphology of galaxy clusters, as a function of their detection method and redshift. We analyze two separate samples of galaxy clusters: a sample of 36 clusters at 0.35 < z < 0.9 selected in the X-ray with the ROSAT PSPC 400 deg2 survey, and a sample of 90 clusters at 0.25 < z < 1.2 selected via the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope. Clusters from both samples have similar-quality Chandra observations, which allow us to quantify their X-ray morphologies via two distinct methods: centroid shifts and photon asymmetry. The latter technique provides nearly unbiased morphology estimates for clusters spanning a broad range of redshift and data quality. We further compare the X-ray morphologies of X-ray- and SZ-selected clusters with those of simulated clusters. We do not find a statistically significant difference in the measured X-ray morphology of X-ray and SZ-selected clusters over the redshift range probed by these samples, suggesting that the two are probing similar populations of clusters. We find that the X-ray morphologies of simulated clusters are statistically indistinguishable from those of X-ray- or SZ-selected clusters, implying that the most important physics for dictating the large-scale gas morphology (outside of the core) is well-approximated in these simulations. Finally, we find no statistically significant redshift evolution in the X-ray morphology (both for observed and simulated clusters), over the range z ~ 0.3 to z ~ 1, seemingly in contradiction with the redshift-dependent halo merger rate predicted by simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑