Evolution in the halo masses of isolated galaxies between z ∼ 1 and z ∼ 0: From DEEP2 to SDSS

Charlie Conroy, Francisco Prada, Jeffrey A. Newman, Darren Croton, Alison L. Coil, Christopher J. Conselice, Michael C. Cooper, Marc Davis, S. M. Faber, Brian F. Gerke, Puragra Guhathakurta, Anatoly Klypin, David C. Koo, Renbin Yan

Research output: Contribution to journalArticlepeer-review

110 Scopus citations


We measure the evolution in the virial mass-to-light ratio (M 200/LB) and virial-to-stellar mass ratio (M 200/M*) for isolated ∼L* galaxies between z ∼ 1 and z ∼ 0 by combining data from the DEEP2 Galaxy Redshift Survey and the Sloan Digital Sky Survey. Utilizing the motions of satellite galaxies around isolated galaxies, we measure line-of-sight velocity dispersions and derive dark matter halo virial masses for these host galaxies. At both epochs the velocity dispersion of satellites correlates with host galaxy stellar mass, σ∝ M*0.4±0.1, while the relation between satellite velocity dispersion and host galaxy B-band luminosity may grow somewhat shallower from σ ∝ LB0.6±0.1 at z ∼ 1 to σ ∝ LB0.4±0.1 at z ∼ 0. The evolution in M200/M* from z ∼ 1 to z ∼ 0 displays a bimodality insofar as host galaxies with stellar mass below M* ∼ 1011 h-1 M maintain a constant ratio (the intrinsic increase is constrained to a factor of 1.1 ± 0.5) while host galaxies above M* ∼ 1011 h-1 M experience a factor of 3.3 ± 2.2 increase in their virial-to-stellar mass ratio. This result can be easily understood if galaxies below this stellar mass scale continue to form stars while star formation in galaxies above this scale is quenched and the dark matter halos of galaxies both above and below this scale grow in accordance with ACDM cosmological simulations. Host galaxies that are red in U-B color have larger satellite dispersions and hence reside on average in more massive halos than blue galaxies at both z ∼ 1 and z ∼ 0. The satellite population of host galaxies varies little between these epochs. The redshift and host galaxy stellar mass dependence of M200/ M* agrees qualitatively with the Millennium Run semianalytic model of galaxy formation.

Original languageEnglish
Pages (from-to)153-171
Number of pages19
JournalAstrophysical Journal
Issue number1 I
StatePublished - Jan 1 2007


  • Galaxies: evolution
  • Galaxies: halos
  • Galaxies: kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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