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The discovery of two distant, massive clusters of galaxies in the ROSAT All-Sky Survey

Edge, A.C.; Ebeling, H.; Bremer, M.; Röttgering, H.; van Haarlem, M.P.; Rengelink, R.; Courtney, N.J.D.

The discovery of two distant, massive clusters of galaxies in the ROSAT All-Sky Survey Thumbnail


H. Ebeling

M. Bremer

H. Röttgering

M.P. van Haarlem

R. Rengelink

N.J.D. Courtney


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.


Edge, A., Ebeling, H., Bremer, M., Röttgering, H., van Haarlem, M., Rengelink, R., & Courtney, N. (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), 913-924.

Journal Article Type Article
Publication Date 2003-03
Deposit Date Nov 22, 2006
Publicly Available Date Aug 11, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 339
Issue 4
Pages 913-924
Keywords Galaxies, Clusters, MACS J0717.5+3745, MACS J1621.3+3810, Cooling flows, Radio continuum.
Publisher URL


Published Journal Article (1.7 Mb)

Copyright 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.

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