On the Evolution of X-Ray Clusters at High Redshift
Open Access
- 20 April 1997
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 479 (2), L117-L120
- https://doi.org/10.1086/310593
Abstract
We report on the first results from a redshift survey of a flux-limited sample of X-ray clusters selected serendipitously from the ROSAT PSPC data archive. We spectroscopically confirm 15 clusters in the range 0.3 < z < 0.7, to a flux limit of 3.9 × 10-14 ergs s-1 cm-2, over a survey area of 17.2 deg2. The surface density of clusters in our survey is 2.0+ 0.4−0.3 deg-2, in good agreement with the number density of cluster candidates detected using algorithms designed to search for very extended sources. The number of clusters detected between 0.3 < z < 0.7 is consistent with a prediction based on a simple extrapolation of the local X-ray cluster luminosity function, which indicates that over this redshift range no significant evolution in the cluster population has taken place. These results are in conflict with recent claims that the number density of X-ray clusters found in deep ROSAT PSPC pointings evolves rapidly beyond z = 0.3.This publication has 17 references indexed in Scilit:
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