RedMaPPer: Evolution and mass dependence of the conditional luminosity functions of red galaxies in galaxy clusters

Chun Hao To, Rachel M. Reddick, Eduardo Rozo, Eli Rykoff, Risa H. Wechsler

Research output: Contribution to journalArticlepeer-review


We characterize the luminosity distribution, halo mass dependence, and redshift evolution of red galaxies in galaxy clusters using the SDSS Data Release 8 redMaPPer cluster sample. We propose a simple prescription for the relationship between the luminosity of both central and satellite galaxies and the mass of their host halos, and show that this model is well-fit by the data. Using a larger galaxy cluster sample than previously employed in the literature, we find that the luminosities of central galaxies scale as hlog Li ∝ AL log(M200b), with AL = 0.39 ± 0.04, and that the scatter of the central-galaxy luminosity at fixed M200blog L|M) is 0.23+00..0504 dex, with the error bar including systematics due to miscentering of the cluster finder, photometry, and photometric redshift estimation. Our data prefers a positive correlation between the luminosity of central galaxies and the observed richness of clusters at a fixed halo mass, with an effective correlation coefficient deff = 0.36+00..1716. The characteristic luminosity of satellites becomes dimmer from z = 0.3 to z = 0.1 by ∼ 20% after accounting for passive evolution. We estimate the fraction of galaxy clusters where the brightest galaxy is not the central to be PBNC ∼ 20%. We discuss implications of these findings in the context of galaxy evolution and the galaxy-halo connection.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Oct 3 2019


  • Galaxy clusters
  • Galaxy dark matter halos
  • Galaxy evolution
  • Large-scale structure of universe

ASJC Scopus subject areas

  • General

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