X-ray selection provides a way of creating well-defined samples of distant clusters free from projection effects and with a well-understood selection function. This paper describes the creation of one such catalogue — the Southern Serendipitous High-redshift Archival ROSAT Cluster (SHARC) survey — which covers an area of 17.7 deg2 and consists of 32 clusters with redshifts between 0.05 and 0.7 and X-ray luminosities between 7 × 1042 and 4 × 1044 erg s−1: the high-redshift subsample contains 16 clusters with z≥ 0.3 and X-ray luminosities greater than 2 × 1043 erg s−1 (luminosities are quoted for the 0.5–2.0 keV energy band). The catalogue is in good agreement with those of other ROSAT cluster surveys for those fields in common. The high-redshift sample is consistent with there being no evolution in the cluster X-ray luminosity function at luminosities ∼1044 erg s−1: the implications of this work have been described elsewhere.
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Burke et al. (2003) studied this question.
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