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A change in the cluster environments of radio galaxies with cosmic epoch
Hill, Gary J.; Lilly, Simon J.
AA(Hawaii, University, Honolulu; McDonald Observatory, Austin, TX), AB(Hawaii, University, Honolulu)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 1-18. (ApJ Homepage)
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NASA/STI Keywords:
Extragalactic Radio Sources, Galactic Clusters, Quasars, Radio Galaxies, Red Shift, Active Galactic Nuclei, Galactic Evolution
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The results of an investigation into the cluster environments of radio galaxies spanning a wide range of radio power within a narrow range of redshift at z about 0.5 are presented. It is found that about half of the powerful classical double radio sources at z about 0.5 inhabit rich clusters, even though similar sources avoid such environments at low redshift. It is shown that this change includes not only the most powerful sources, but also sources of moderate power where a direct comparison with low-redshift sources is possible. The lowest power radio galaxies appear to inhabit similar environments at both epochs. In deriving these results, it is shown that the absolute magnitudes of the radio galaxies, and probably also of characteristic L(asterisk) galaxies, have not changed significantly since z about 0.5. The implications for the cosmological evolution of the radio source population are discussed.

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