Cluster selection and the evolution of brightest cluster galaxies

Feb, 2000
4 pages
Published in:
  • Astrophys.J.Lett. 532 (2000) L105
e-Print:
Report number:
  • IFA-00-04

Citations per year

200020062012201820222301
Abstract: (arXiv)
The K-band Hubble diagram of Brightest Cluster Galaxies (BCGs) is presented for a large, X-ray selected cluster sample extending out to z = 0.8. The controversy over the degree of BCG evolution is shown to be due to sample selection, since the BCG luminosity depends upon the cluster environment. Selecting only the most X-ray luminous clusters produces a BCG sample which shows, under the assumption of an Einstein-de Sitter cosmology, significantly less mass growth than that predicted by current semi-analytic galaxy formation models, and significant evidence of any growth only if the dominant stellar population of the BCGs formed relatively recently (z <= 2.6).
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