Ebeling, H. and Edge, A.C. and Mantz, A. and Barrett, E. and Henry, J.P. and Ma, C.J. and van Speybroeck, L. (2010) 'The X-ray brightest clusters of galaxies from the Massive Cluster Survey.', Monthly notices of the Royal Astronomical Society., 407 (1). pp. 83-93.
We present a statistically complete sample of very X-ray luminous galaxy clusters detected in the MAssive Cluster Survey (MACS). This second MACS release comprises all 34 MACS clusters with nominal X-ray fluxes in excess of 2 × 10−12 erg s−1 cm−2 (0.1–2.4 keV) in the ROSAT Bright Source Catalogue; two-thirds of them are new discoveries. Extending over the redshift range from 0.3 to 0.5, this subset complements the complete sample of the 12 most distant MACS clusters (z > 0.5) published in 2007 and further exemplifies the efficacy of X-ray selection for the compilation of samples of intrinsically massive galaxy clusters. Extensive follow-up observations with Chandra/ACIS led to three additional MACS cluster candidates being eliminated as (predominantly) X-ray point sources. For another four clusters – which, however, remain in our sample of 34 – the point-source contamination was found to be about 50 per cent. The median X-ray luminosity of 1.3 × 1045 erg s−1 (0.1–2.4 keV, Chandra, within r500) of the clusters in this subsample demonstrates the power of the MACS strategy to find the most extreme and rarest clusters out to significant redshift. A comparison of the optical and X-ray data for all clusters in this release finds a wide range of morphologies with no obvious bias in favour of either relaxed or merging systems.
|Keywords:||Catalogues, Surveys, Galaxies, Clusters, X-rays.|
|Full text:||(NA) Not Applicable |
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|Publisher Web site:||http://dx.doi.org/10.1111/j.1365-2966.2010.16920.x|
|Date accepted:||No date available|
|Date deposited:||No date available|
|Date of first online publication:||September 2010|
|Date first made open access:||No date available|
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