Discovery of Distant Galaxy Clusters in the ROX Survey

Mathematics – Logic

Scientific paper

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Scientific paper

Distant galaxy clusters are key to the study of galaxy evolution in dense environments and to the independent measurement of cosmological parameters. The number of known clusters at redshifts around unity and higher is small but increasing rapidly -at present there are not enough clusters to measure good statistics at each redshift, nor to study how evolution depends on cluster mass, x-ray temperature, etc. The ROSAT Optical X-ray Survey (Donahue et al. 2002 ApJ 569, 689) searched for galaxy clusters using both optical and x-ray detection methods. Of 57 diffuse x-ray sources found, 10 were not detected in I-band, suggesting either high redshift or a spurious x-ray detection. We imaged the 10 fields in the near infrared J and K bands, and in several cases confirmed the existence of the cluster by detecting the red sequence of the member galaxies. We report the clusters discovered and what is known of their properties.

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