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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358755.0, MPI für Astronomie / Publikationen_mpia
Galaxy luminosity functions to z~1 from DEEP2 and COMBO-17: implications for red galaxy formation
Authors:Faber, S. M.; Willmer, C. N. A.; Wolf, C.; Koo, D. C.; Weiner, B. J.; Newman, J. A.; Im, M.; Coil, A. L.; Conroy, C.; Cooper, M. C.; Davis, M.; Finkbeiner, D. P.; Gerke, B. F.; Gebhardt, K.; Groth, E. J.; Guhathakurta, P.; Harker, J.; Kaiser, N.; Kassin, S.; Kleinheinrich, M.; Konidaris, N. P.; Kron, R. G.; Lin, L.; Luppino, G.; Madgwick, D. S.; Meisenheimer, K.; Noeske, K. G.; Phillips, A. C.; Sarajedini, V. L.; Schiavon, R. P.; Simard, L.; Szalay, A. S.; Vogt, N. P.; Yan, R.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal
Start Page:265
End Page:294
Audience:Not Specified
Abstract / Description: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, M*B has dimmed by 1.2-1.3 mag for all colors of galaxies, phi* for blue galaxies has hardly changed, and phi* 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 the new red galaxies, a ``mixed'' scenario is proposed in which star formation in blue cloud galaxies is quenched, causing them to migrate to the red sequence, where they merge further in a small number of stellar mergers. This mixed scenario matches the local boxy-disky transition for nearby ellipticals, as well as red sequence stellar population scaling laws such as the color-magnitude and Mg-sigma relations (which are explained as fossil relics from blue progenitors). Blue galaxies enter the red sequence via different quenching modes, each of which peaks at a different characteristic mass and time. The red sequence therefore likely builds up in different ways at different times and masses, and the concept of a single process that is ``downsizing'' (or upsizing) probably does not apply. Our claim in this paper of a rise in the number of red galaxies applies to galaxies near L*. Accurate counts of brighter galaxies on the steep part of the Schechter function require more accurate photometry than is currently available. Based on observations taken at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology, and on observations made with the NASA/ESO Hubble Space Telescope, obtained from the data archives at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555, and from the Canadian Astronomy Data Centre.
Free Keywords:Galaxies: Distances and Redshifts; Galaxies: Evolution; Galaxies: Luminosity Function; Mass Function
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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