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The discovery of two distant, massive clusters of galaxies in the ROSAT all-sky survey.

Edge, A. C. and Ebeling, H. and Bremer, M. and Röttgering, H. and van Haarlem, M. P. and Rengelink, R. and Courtney, N. J. D. (2003) 'The discovery of two distant, massive clusters of galaxies in the ROSAT all-sky survey.', Monthly notices of the Royal Astronomical Society., 339 (4). pp. 913-924.


We discuss the radio, optical, and X-ray properties of two newly discovered, very X-ray luminous, distant clusters of galaxies. Both systems were noted as cluster candidates in a cross-correlation of data from the WENSS radio survey and the ROSAT All-Sky Survey. Follow-up observations performed by us and the Massive Cluster Survey (MACS) team confirmed both sources as distant galaxy clusters. The first cluster, MACS J0717.5+3745 at a redshift of z= 0.5548, contains a very extended, steep-spectrum radio source offset from the cluster core, making it the most distant radio relic known. The second cluster, MACS J1621.3+3810 at z= 0.465, is a strong cooling flow with a relatively weak central radio source. We present results from ROSAT High-Resolution Imager (HRI) observations of both clusters as well as from optical imaging and VLA radio interferometry observations. Our discoveries demonstrate that distant clusters can be efficiently identified in a relatively shallow X-ray survey, that radio/X-ray selection is efficient, and that both cooling flow and non-cooling flow clusters are selected.

Item Type:Article
Keywords:Galaxies, Clusters, MACS J0717.5+3745, MACS J1621.3+3810, Cooling flows, Radio continuum.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2003 The Authors Published on behalf of Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:11 August 2014
Date of first online publication:March 2003
Date first made open access:No date available

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