Precise Measurements of the Hubble Constant and Structures of Clusters of Galaxies

在星系团结构的理论和观测研究基础上，我们建立了一个新的星系团内气体分布模型。我们的模型与观测数据的拟合比等温β模型好得多，并且使用我们的模型导出的星系团质量分布有解决从X射线和引力透镜数据获得的值之间的差异的趋势。本文还对A2029的XMM-牛顿法X射线数据进行了分析。A2029是一个典型的cD型星系团，中心有一个巨大的cD星系。虽然对这一聚类的数据分析仍在进行中，但已经获得了许多有趣的结果。在利用Sunyaev-Zel'dovich效应测量Hubble常数Ho时，我们成功地获得了ROSAT、ASCA（X射线）和Ryle望远镜（射电）观测到的5个（0.143[小于或等于]z[小于或等于]0.282）星系团的有效数据。在ACDM（ΩM=0.3，ΩA=0.7）平坦宇宙中，它们的平均值为66+11/-10（随机）+9/-8（系统）km/s/Mpc。这个Ho值略小于WMAP宇宙微波背景辐射观测得到的Ho=71±2 km/s/Mpc，但在误差范围内，两者吻合得很好。

On the theoretical and observational investigations of the structure of clusters of galaxies, we established a new model of intracluster gas distribution. The fitting of our model with observational data is considerably better than the isothermal beta model, and the cluster mass distribution derived by using our model has a tendency to solve the discrepancy between the values obtained from the X-ray and the gravitational-lensing data. We made also the analysis of X-ray data of A2029 obtained with XMM-Newton. A2029 is a typical cD-type cluster of galaxies having a giant cD galaxy in the center. Although the data analysis of this cluster is still going on, many interesting results have been obtained. For example, in the central region a two-temperature model is preferred to some ordinary single temperature models.On the measurement of the Hubble constant, Ho, using the Sunyaev-Zel'dovich effect, we succeeded to obtain available data for five distant (0.143【less than or equal】z【less than or equal】0.282) clusters of galaxies observed with ROSAT, ASCA (X-ray) and the Ryle Telescope (radio). The obtained value of Ho for these clusters are considerably scattered, and their mean value is 66+11/-10 (random) +9/-8 (systematic) km/s/Mpc for a ACDM (ΩM=0.3, ΩA=0.7) flat universe. This value of Ho is slightly less than the value of Ho=71±2 km/s/Mpc obtained from WMAP observations of the cosmic microwave background radiation, but they are in good agreement within their errors.