2008A&A...477..763S


Query : 2008A&A...477..763S

2008A&A...477..763S - Astronomy and Astrophysics, volume 477, 763-773 (2008/1-3)

The red and blue galaxy populations in the GOODS field: evidence for an excess of red dwarfs.

SALIMBENI S., GIALLONGO E., MENCI N., CASTELLANO M., FONTANA A., GRAZIAN A., PENTERICCI L., TREVESE D., CRISTIANI S., NONINO M. and VANZELLA E.

Abstract (from CDS):

We study the evolution of the galaxy population up to z∼3 as a function of its colour properties. In particular, luminosity functions and luminosity densities were derived as a function of redshift for the blue/late and red/early populations. We use data from the GOODS-MUSIC catalogue, which have typical magnitude limits z850≤26 and Ks≤23.5 for most of the sample. About 8% of the galaxies have spectroscopic redshifts; the remaining have well calibrated photometric redshifts derived from the extremely wide multi-wavelength coverage in 14 bands (from the U band to the Spitzer 8µm band). We have derived a catalogue of galaxies complete in the rest-frame B-band, which has been divided into two subsamples according to their rest-frame U-V colour (or derived specific star formation rate) properties. We confirm a bimodality in the U-V colour and specific star formation rate of the galaxy sample up to z∼3. This bimodality is used to compute the luminosity functions of the blue/late and red/early subsamples. The luminosity functions of the blue/late and total samples are well represented by steep Schechter functions evolving in luminosity with increasing redshifts. The volume density of the luminosity functions of the red/early populations decreases with increasing redshift. The shape of the red/early luminosity functions shows an excess of faint red dwarfs with respect to the extrapolation of a flat Schechter function and can be represented by the sum of two Schechter functions. Our model for galaxy formation in the hierarchical clustering scenario, which also includes external feedback due to a diffuse UV background, shows a general broad agreement with the luminosity functions of both populations, the larger discrepancies being present at the faint end for the red population. Hints on the nature of the red dwarf population are given on the basis of their stellar mass and spatial distributions.

Abstract Copyright:

Journal keyword(s): galaxies: distances and redshifts - galaxies: evolution - galaxies: high-redshift - galaxies: luminosity function, mass function

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME FDF reg 01 06 03.6 -25 45 46           ~ 123 0
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1186 1
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1943 1

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2022.05.28-10:48:11

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