Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274...75c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 1, pp. 75-84.
Astronomy and Astrophysics
Astronomy
77
Surveys, Galaxies: Clusters: General, Cooling Flows, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Stellar Content, X-Rays: Galaxies
Scientific paper
We report results from the second stage of an optical follow-up study aimed at determining new redshifts for clusters of galaxies selected from the ROSAT All-Sky Survey. We review the optical properties of all the clusters obtained so far in this programme, which comprises 71 clusters up to a redshift of 0.3. The fraction of central galaxies exhibiting optical line emission and an excess blue continuum is 34 per cent, consistent with smaller, previous, X-ray samples. There is no trend for this fraction to increase with redshift, although we find a clear tendency for the strongest line emitters to have the bluest continua. The probability of the presence of line emission and an excess blue continuum is increased for those galaxies with associated radio sources, although the strength of these features does not appear to be related to the power of the radio emission.
Allen Steven W.
Böhringer Hans
Crawford Carolin S.
Ebeling Harald
Edge Alastair C.
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