Cluster environments around quasars at 0.5 < z < 0.8

Details Cluster environments around quasars at 0.5 < z < 0.8 Cluster environments around quasars at 0.5 < z < 0.8

1999-10-14

arxiv.org/abs/astro-ph/9910261v1

"Clustering at high redshift", ASP.Conf.Ser. 200, 57

Astronomy and Astrophysics

Astrophysics

2 pages, to appear in the proceedings of the Marseille IGRAP conference 1999, "Clustering at high redshift"

Scientific paper

We have observed the galaxy environments around two complete samples of radio-loud (steep-spectrum) and radio-quiet quasars (RLQ and RQQ) at 0.5 < z < 0.8 that are matched in B-luminosity, and find that the environments of both quasar populations are pratically indistinguishable. A few objects are found in relatively rich clusters, but on average, they seem to prefer galaxy groups or cluster of approximatly Abell class 0. By combining the RLQ sample with samples from the literature, we detect a weak, but significant, positive correlation between environmental richness and quasar radio luminosity. This may give us clues about what determines a quasar's radio luminosity.

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