Quasar environments at 0.5 < z < 0.8

Details Quasar environments at 0.5 < z < 0.8 Quasar environments at 0.5 < z < 0.8

2000-06-05

arxiv.org/abs/astro-ph/0006063v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures. To appear in the proc. of "The NOT in the 2000s", LaPalma, April 12-14, 2000

Scientific paper

Over the past few years, we have been collecting data with the Nordic Optical Telescope (NOT) on the galaxy environments around active galactic nuclei (AGN). Here we present some results from a sample of 21 radio-loud and 20 radio-quiet quasars in the redshift range 0.5 < z < 0.8. We find a few quasars in very rich environments, perhaps as rich as Abell class 1-2 clusters, but more often the quasars seem to prefer groups and poorer clusters. We also find that on average the galaxy environments around radio-loud and radio-quiet quasars are indistinguishable, consistent with the findings that both powerful radio-loud and radio-quiet quasars appear to be hosted by luminous galaxies with luminosities higher than the break in the luminosity function (Dunlop et al. 1993; Taylor et al. 1996). Comparing the galaxy richnesses in the radio-loud quasar fields with quasar fields in the literature, we find a weak, but significant, correlation between quasar radio luminosity and environmental richness.

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