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.
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Willott, C.J., Rawlings, S., Blundell, K.M. (2001). Extremely Red Radio Galaxies. In: Márquez, I., Masegosa, J., del Olmo, A., Lara, L., García, E., Molina, J. (eds) QSO Hosts and Their Environments. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0695-9_19
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DOI: https://doi.org/10.1007/978-1-4615-0695-9_19
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