Distant Cluster Hunting: A comparison of optical and X-ray cluster finding with the Rosat Optical X-ray Survey (ROXS)

Details Distant Cluster Hunting: A comparison of optical and X-ray cluster finding with the Rosat Optical X-ray Survey (ROXS) Distant Cluster Hunting: A comparison of optical and X-ray cluster finding with the Rosat Optical X-ray Survey (ROXS)

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.5702d&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #57.02; Bulletin of the American Astronomical Society, Vol. 32, p.1498

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a summary of results of the Rosat Optical X-ray survey, a survey utilizing both X-ray and optical detection techniques to reveal the locations and to estimate the properties (redshift, optical and X-ray luminosities) of clusters of galaxies. The matched filter algorithm of Postman and Lauer is used to detect galaxy clusters in galaxy catalogs (limiting magnitudes of I ~ 23) of CCD images of the central 30' by 30' of extragalactic Rosat fields with relatively long exposure times. We identify X-ray cluster candidates with a wavelet technique developed by Rosati. We identify 57 cluster candidates, of which 35 targets were unaffected by bright stars, confusion, or uncertain X-ray fluxes; we identify 147 optical candidates in the same fields with a formal significance of >3. Thirty one out of 35 X-ray clusters were detected optically; 26 of these are very secure cross-IDs. A more subjective inspection of the optical candidates revealed that at least 57 of these clusters appear optically significant yet have no X-ray counterpart. We present an analysis of these results and we conclude that the estimated optical luminosities of candidates have more scatter relative to the clusters' masses than do the X-ray luminosities. A prediction can be made that X-ray faint clusters are low-mass clusters with correspondingly low temperatures and weak lensing signatures.

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