2011ApJ...727...51N -
Astrophys. J., 727, 51 (2011/January-3)
Red-sequence galaxies at high redshift by the COMBO-17+4 survey.
NICOL M.-H., MEISENHEIMER K., WOLF C. and TAPKEN C.
Abstract (from CDS):
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 = 21m.7. We measure the rest-frame color (U280-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 Å 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 (U280-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☉>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☉= 11.5 are already in place at z ∼ 2.
Abstract Copyright:
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Journal keyword(s):
galaxies: evolution - galaxies: high-redshift - galaxies: photometry - galaxies: stellar content - surveys
Simbad objects:
4
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