{
  "id": "astro-ph/9802245",
  "version": "v1",
  "published": "1998-02-18T18:49:39.000Z",
  "updated": "1998-02-18T18:49:39.000Z",
  "title": "Evolution of the colour-magnitude relation of early-type galaxies in distant clusters",
  "authors": [
    "T. Kodama",
    "N. Arimoto",
    "A. J. Barger",
    "A. Aragon-Salamanca"
  ],
  "comment": "13 pages, 5 postscript figures, Latex (A&A format), uses epsf.sty and aa.cls, Accepted for publication in A&A Main Jounal",
  "journal": "Astron.Astrophys. 334 (1998) 99-109",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We present a thorough quantitative analysis of the evolution of the colour-magnitude relation for early-type galaxies in 17 distant clusters with redshifts 0.31 < z < 1.27 using the Kodama & Arimoto (1997) evolutionary model for elliptical galaxies. The model is calibrated to reproduce the colour- magnitude relation for Coma ellipticals at z ~ 0 and gives the evolution of the slope and zero-point as a function of redshift. We find no significant differences between the colour-magnitude relations of the clusters in our sample. The slopes can be reproduced by a single model sequence in which all elliptical galaxies are assumed to be equally old (the maximum age difference allowed for the brightest 3 magnitudes is only 1 Gyr) and to have mean stellar metallicities which vary as a function of galaxy luminosity. The zero-points of the colour-magnitude relations constrain the epoch of major star formation in early-type galaxies to z_f>2-4. This study provides two important constraints for any model of the formation of rich clusters: the uniformity of the ages of the stellar populations in the early-type galaxies and the universality of the metallicity sequence of these galaxies as a function of galaxy mass.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1998-02-18T18:49:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "early-type galaxies",
      "distant clusters",
      "colour-magnitude relation",
      "galaxy mass",
      "rich clusters"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 488522
    }
  }
}