Extremely red radio galaxies
Abstract
At least half the radio galaxies at z>1 in the 7C Redshift Survey have extremely red colours (R-K>5), consistent with stellar populations which formed at high redshift (z>5). We discuss the implications of this for the evolution of massive galaxies in general and for the fraction of near-IR-selected EROs which host AGN, a result which is now being tested by deep, hard X-ray surveys. The conclusion is that many massive galaxies undergo at least two active phases: one at z~5 when the black hole and stellar bulge formed and another at z~1-2 when activity is triggered by an event such as an interaction or merger.
Cite
@article{arxiv.astro-ph/0104118,
title = {Extremely red radio galaxies},
author = {Chris J. Willott and Steve Rawlings and Katherine M. Blundell},
journal= {arXiv preprint arXiv:astro-ph/0104118},
year = {2007}
}
Comments
6 pages, 2 figures, to appear in the proceedings of the workshop on "QSO hosts and their environments", IAA, Granada, 10-12 Jan 2001, Ed. I. Marquez