B_gg revisited: The environments of low-excitation radio galaxies and unified models

Details B_gg revisited: The environments of low-excitation radio galaxies and unified models B_gg revisited: The environments of low-excitation radio galaxies and unified models

2003-11-24

arxiv.org/abs/astro-ph/0311536v1

Astron.Astrophys. 414 (2004) 927-929

Astronomy and Astrophysics

Astrophysics

4 pages, accepted as an A&A research note

Scientific paper

10.1051/0004-6361:20035605

Recent measurements of the galaxy clustering environments around intermediate-redshift radio sources have suggested a systematic environmental difference between radio galaxies and radio-loud quasars, in contradiction to the predictions of simple unified models for the two classes of object. I show that the apparent difference arises mainly as a result of the properties of low-excitation radio galaxies included in the radio-galaxy sample, which tend to lie in significantly richer environments. The environmental properties of high-excitation radio galaxies and quasars are statistically consistent in the redshift range 0.15 < z <0.4, as unified models would predict.

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