Investigations of a Statistically Complete Sample of Galaxy Clusters

最近完成的X射线全天空调查， ROSAT卫星可以提供星系团的样本， 既有完善的量化选择标准， 在天空中的一个连续区域。 为了获得这个样本， 有必要从更多的其他集群中确定集群 源 首席研究员只是美国少数几个 受邀参加ROSAT巡天的天文学家， 在发布之前就可以访问这些X射线数据。 这 该笔拨款将用于资助 特别强调初始的聚类样本 识别集群和随后的调查 X射线和光学性质的演变，大尺度结构， 以及经典的星等-红移关系。 分析 ROSAT数据将使以前的系统有重大改进 要做的研究。

The recently completed X-ray all-sky survey carried out by the ROSAT satellite can provide a sample of clusters of galaxies which has both well established quantifiable selection criteria and is in a contiguous region of the sky. To obtain this sample it is necessary to identify the clusters from the more numerous other sources. The Principal Investigator is only one of a few US astronomers who were invited to participate in the ROSAT survey and has access to this X-ray data well in advance of publication. This grant will provide support for follow-up optical studies of the cluster sample with particular emphasis on the initial identification of the clusters and later investigations of evolution of X-ray and optical properties, large scale structure, and the classical magnitude-redshift relation. Analysis of the ROSAT data will enable significant improvements over previous studies to be made.