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

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

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.339..913e&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 4, pp. 913-924.

Astronomy and Astrophysics

Astronomy

22

Galaxies: Clusters: Individual: Macs J0717.5+3745, Galaxies: Clusters: Individual: Macs J1621.3+3810, Cooling Flows, Radio Continuum: Galaxies

Scientific paper

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.

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