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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607267.0, MPI für Astronomie / Publikationen_mpia
Red-sequence Galaxies at High Redshift by the COMBO-17+4 Survey
Authors:Nicol, M.-H.; Meisenheimer, K.; Wolf, C.; Tapken, C.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal
Start Page:51
Audience:Not Specified
Abstract / Description:We investigate the evolution of the galaxy population since redshift 2 with a focus on the color bimodality and mass density of the red sequence. We obtain precise and reliable photometric redshifts up to z = 2 by supplementing the optical survey COMBO-17 with observations in four near-infrared bands on 0.2 deg2 of the COMBO-17 A901-field. Our results are based on an H-band-selected catalog of 10,692 galaxies complete to H = 21fm7. We measure the rest-frame color (U 280-V) of each galaxy, which across the redshift range of our interest requires no extrapolation and is robust against moderate redshift errors by staying clear of the 4000 Ã… break. We measure the color-magnitude relation of the red sequence as a function of look-back time from the peak in a color-error-weighted histogram, and thus trace the galaxy bimodality out to z ~= 1.65. The (U 280-V) of the red sequence is found to evolve almost linearly with look-back time. At high redshift, we find massive galaxies in both the red and the blue population. Red-sequence galaxies with log M */M sun>11 increase in mass density by a factor of ~4 from z ~ 2 to 1 and remain nearly constant at z < 1. However, some galaxies as massive as log M */M sun = 11.5 are already in place at z ~ 2.
Free Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: photometry; galaxies: stellar content; surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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