Clusters of galaxies associated with quasars. I - 3C 206

Details Clusters of galaxies associated with quasars. I - 3C 206 Clusters of galaxies associated with quasars. I - 3C 206

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1539e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1539-1549.

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16

Astronomical Photometry, Astronomical Spectroscopy, Galactic Clusters, Quasars, Charge Coupled Devices, Color-Color Diagram, Red Shift

Scientific paper

Multislit spectroscopy and three-color CCD photometry of the galaxies in the cluster associated with the quasar 3C 206 (PKS 0837-12) at z = 0.198 are presented. This cluster is the richest environment of any low-redshift quasar observed in an Abell richness class 1 cluster. The cluster has a very flattened structure and a very concentrated core about the quasar. Most of the galaxies in this field have colors and luminosities consistent with normal galaxies at this redshift. The background-corrected blue fraction of galaxies is consistent with values for other rich clusters. The existence of several blue galaxies in the concentrated cluster core is an anomaly for a region of such high galaxy density, however, suggesting the absence of a substantial intracluster medium. This claim is supported by the Fanaroff-Riley (1974) class II morphology of the radio source. The velocity dispersion calculated from 11 spectroscopically confirmed cluster members is 500 + or - 110 km/s, which is slightly lower than the average for Abell class 1 clusters. A high frequency of interaction between the quasar host galaxy and cluster core members at low relative velocities, and a low intracluster gas pressure, may comprise a favorable environment for quasar activity. The properties of the cluster of galaxies associated with 3C 206 are consistent with this model.

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