Discovery of a Redshift 0.8 Cluster of Galaxies in the ROSAT North Ecliptic Pole Survey.

Details Discovery of a Redshift 0.8 Cluster of Galaxies in the ROSAT North Ecliptic Pole Survey. Discovery of a Redshift 0.8 Cluster of Galaxies in the ROSAT North Ecliptic Pole Survey.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1293h&link_type=abstract

The Astronomical Journal, v. 114, p. 1293.

Astronomy and Astrophysics

Astronomy

50

X-Rays: Galaxies, Galaxies: Clusters: Individual: Rx J1716.6+6708

Scientific paper

We report the discovery of RX J1716.6+6708, an X-ray emitting cluster of galaxies at a redshift of 0.813. This cluster is only the third such X-ray emitting object known at redshifts greater than 0.8. X-ray emitting clusters at extreme distances are of special importance because they are massive, comparable to low-redshift examples, and their existence is problematic for some theories of structure formation. The luminosity of RX J1716.6+6708 is 3.2×1044 erg s-1 and the velocity dispersion of its member galaxies, based on 12 redshifts, is 1892 km s-1 The galaxies in RX 11716.6+6708 are spread along a filament perhaps indicating that it is more properly called a protocluster.

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