论文标题
从X射线图像评估的星系簇的动力状态
Dynamical state of galaxy clusters evaluated from X-ray images
论文作者
论文摘要
星系簇的X射线图像通常显示出干扰的结构，这些结构表明聚类合并的指示。作为我们先前在Chandra观察到的964个簇的动态状态的工作的补充，我们为XMM-Newton档案数据的1308个簇处理X射线图像，以及Chandra新发布的22个簇的图像，并从这些X射线图像中评估其动态状态。浓度指数$ c $，质心偏移$ω$，功率比$ p_3/p_0 $是在一定半径为500 kpc的圆形区域中计算的，并且在椭圆形区域内估计了形态指数$δ$，适应群集的大小和形状。此外，根据新可用的红移升级了先前从钱德拉图像估算的42个簇的动力学参数。在两个数据集中的重叠样本中，源自XMM-Newton的动态参数和Chandra图像之间的动力学参数之间存在良好的一致性。通过使用388个簇的数据显示质量比例关系对动态状态的依赖性。
X-ray images of galaxy clusters often show disturbed structures that are indication of cluster mergers. As a complementary to our previous work on dynamical state of 964 clusters observed by the Chandra, we process the X-ray images for 1308 clusters from XMM-Newton archival data, together with the images of 22 clusters newly released by the Chandra, and evaluate their dynamical state from these X-ray images. The concentration index $c$, the centroid shift $ω$, the power ratio $P_3/P_0$ are calculated in circular regions with a certain radius of 500 kpc, and the morphology index $δ$ is estimated within elliptical regions adaptive to the cluster size and shape. In addition, the dynamical parameters for 42 clusters previously estimated from Chandra images are upgraded based on the newly available redshifts. Good consistence is found between dynamical parameters derived from XMM-Newton and Chandra images for the overlapped sample of clusters in the two datasets. The dependence of mass scaling relations on dynamical state is shown by using data of 388 clusters.
