标题： WARPS巡天对于遥远星系团的调查 显示英文标题

标题： The WARPS survey for faint Clusters of Galaxies

摘要： WARPS星团巡天基于指向观测的ROSAT PSPC档案。它包括通过Voronoi 镶嵌和渗滤算法（VTP）检测到的扩展X射线源，以及具有非恒星光学对应体的点状X射线源。 它的设计旨在尽量减少选择效应的同时覆盖大面积天空。 该巡天的目标是（a）测量低光度（<10^44 ergs^-1）、高红移（z>0.2）的星团和群组的X射线亮度函数，以及（b）研究星团形态和异常系统（例如，正在合并的星团）。 在最初的13平方度（66个场区）中，我们发现了22个扩展X射线源，它们的流量检测值大于7×10^-14 erg cm^-2 s^-1 （0.5-2.0 keV），大小从1到5角分不等。 在光学上，它们范围从一个被解析的单一明亮近邻星系，到一个显示有两个（可能是正在合并的）成分的Abell星团，再到估计红移超过0.4的星系群和星团。 显示英文摘要

摘要： The WARPS cluster survey is based on the ROSAT PSPC archive of pointed observations. It includes extended X-ray sources, detected with the Voronoi Tessellation and Percolation algorithm (VTP), and point-like X-ray sources with non-stellar optical counterparts. It is designed to minimize selection effects whilst covering a large area of sky. The aims of the survey are to (a) measure the low luminosity (<10^44 ergs^-1), high redshift (z>0.2) X-ray luminosity function of clusters and groups, and (b) investigate cluster morphologies and unusual systems (e.g. merging clusters). In an initial 13 sq deg (66 fields) we have found 22 extended X-ray sources with detected flux >7x10^-14 erg cm^-2s^-1 (0.5-2.0keV) and sizes of 1 to 5 arcmin. Optically they range from a single bright nearby galaxy which has been resolved, an Abell cluster which is revealed to have two (probably merging) components and groups and clusters of galaxies at estimated redshifts beyond z=0.4.