Galaxy Luminosity Functions to z ∼1 from DEEP2 and COMBO‐17: Implications for Red Galaxy Formation

The DEEP2 and COMBO-17 surveys are compared to study luminosity functions of red and blue galaxies to z ~ 1. The two surveys have different methods and sensitivities, but nevertheless results agree. After z ~ 1, Mimg1.gif has dimmed by 1.2-1.3 mag for all colors of galaxies, phgr* for blue galaxies has hardly changed, and phgr* for red galaxies has at least doubled (our formal value is ~0.5 dex). Luminosity density jB has fallen by 0.6 dex for blue galaxies but has remained nearly constant for red galaxies. These results imply that the number and total stellar mass of blue galaxies have been substantially constant since z ~ 1, whereas those of red galaxies (near L*) have been significantly rising. To explain…

• NS
  National Science Foundation

  Awards: 0123690, 0349155, NAS 5-26555
• NA
  National Aeronautics and Space Administration

  Awards: NAS5-26555, NAS 5-26555, 5-26555
• WM
  W. M. Keck Foundation
• EL
  Eli Lilly and Company
• CI
  California Institute of Technology
• AC
  Adolph C. and Mary Sprague Miller Institute for Basic Research in Science, University of California Berkeley
• NM
  New Mexico State University

  Award: NAS 5-26555
• ST
  Space Telescope Science Institute

  Awards: NAS5-26555, NAS 5-26555, 5-26555, 26555
• JP
  Jet Propulsion Laboratory