Detection statistics of Abell and ACO clusters of galaxies in the ROSAT All-Sky Survey

Details Detection statistics of Abell and ACO clusters of galaxies in the ROSAT All-Sky Survey Detection statistics of Abell and ACO clusters of galaxies in the ROSAT All-Sky Survey

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275..360e&link_type=abstract

Astronomy and Astrophysics, Vol. 275, p. 360 (1993)

Astronomy and Astrophysics

Astrophysics

22

Scientific paper

The X-ray emission of the clusters of galaxies compiled by Abell and Abell, Corwin and Olowin (ACO) is investigated utilizing the ROSAT XRT's All-Sky Survey (RASS). X-ray confirmed subsamples of different statistical quality are extracted by setting thresholds in the optical-X-ray source separation obtained in positional cross correlations of the optical and the X-ray sample in order to discriminate against chance coincidences. The analysis is performed for an X-ray sample of almost uniform exposure corresponding to a flux limit of about 7 x 10^-13^ erg cm^-2^ sec^-1^ in the ROSAT energy range between 0.1 and 2.4 keV. For both the Abell and the ACO catalogue the chance of detecting a rich (Abell richness class >= 1) cluster as a RASS source of 22% (for a sample almost free of chance coincidences) is about two to three times higher than for a nominal poor cluster. From the distance dependence of the RASS detection rate we conclude that Abell's and ACO's main compilation might be affected by selection effects and thus incomplete already at redshifts as low as z ~ 0.14. We also investigated ACO's supplementary sample, the RASS-detection distributions for which we found, surprisingly, to show many similarities to the ones for regular clusters in the Abell and ACO catalogues at only slightly lower X-ray detection rates.

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