Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The WARPS Survey: VI. Galaxy Cluster and Source Identifications from
  Phase I   We present in catalog form the optical identifications for objects from the
first phase of the Wide Angle ROSAT Pointed Survey (WARPS). WARPS is a
serendipitous survey of relatively deep, pointed ROSAT observations for
clusters of galaxies. The X-ray source detection algorithm used by WARPS is
Voronoi Tessellation and Percolation (VTP), a technique which is equally
sensitive to point sources and extended sources of low surface brightness.
WARPS-I is based on the central regions of 86 ROSAT PSPC fields, covering an
area of 16.2 square degrees. We describe here the X-ray source screening and
optical identification process for WARPS-I, which yielded 34 clusters at
0.06<z<0.75. Twenty-two of these clusters form a complete, statistically well
defined sample drawn from 75 of these 86 fields, covering an area of 14.1
square degrees, with a flux limit of $F (0.5-2.0 keV) = 6.5 \times 10^{-14} erg
cm^{-2} s^{-1}}$. This sample can be used to study the properties and evolution
of the gas, galaxy and dark matter content of clusters, and to constrain
cosmological parameters. We compare in detail the identification process and
findings of WARPS to those from other recently published X-ray surveys for
clusters, including RDCS, SHARC-Bright, SHARC-south and the CfA 160 deg$^2$
survey.

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The categories of this paper are: hep-ph
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