Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-02
Astronomy and Astrophysics
Astrophysics
9 pages, 4 figures, 2 tables, accepted for publication in Astronomy and Astrophysics
Scientific paper
We have computed the evolution of the rest-frame B-band luminosity function (LF) for bulge and disk-dominated galaxies since z=1.2. We use a sample of 605 spectroscopic redshifts with I_{AB}<24 in the Chandra Deep Field South from the VIMOS-VLT Deep Survey, 3555 galaxies with photometric redshifts from the COMBO-17 multi-color data, coupled with multi-color HST/ACS images from the Great Observatories Origin Deep Survey. We split the sample in bulge- and disk-dominated populations on the basis of asymmetry and concentration parameters measured in the rest-frame B-band. We find that at z=0.4-0.8, the LF slope is significantly steeper for the disk-dominated population (\alpha=-1.19 \pm 0.07) compared to the bulge-dominated population (\alpha=-0.53 \pm 0.13). The LF of the bulge-dominated population is composed of two distinct populations separated in rest-frame color: 68% of red (B-I)_{AB}>0.9 and bright galaxies showing a strongly decreasing LF slope \alpha=+0.55 \pm 0.21, and 32% of blue (B-I)_{AB}<0.9 and more compact galaxies which populate the LF faint-end. We observe that red bulge-dominated galaxies are already well in place at z~1, but the volume density of this population is increasing by a factor 2.7 between z~1 and z~0.6. It may be related to the building-up of massive elliptical galaxies in the hierarchical scenario. In addition, we observe that the blue bulge-dominated population is dimming by 0.7 magnitude between z~1 and z~0.6. Galaxies in this faint and more compact population could possibly be the progenitors of the local dwarf spheroidal galaxies.
Adami Chris
Arnaboldi Magda
Arnout S.
Bardelli Sandro
Bolzonella Micol
No associations
LandOfFree
Galaxy luminosity function per morphological type up to z=1.2 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Galaxy luminosity function per morphological type up to z=1.2, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy luminosity function per morphological type up to z=1.2 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-173166