Galaxy luminosity function per morphological type up to z=1.2
摘要
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.
引用
@article{arxiv.astro-ph/0604010,
title = {Galaxy luminosity function per morphological type up to z=1.2},
author = {O. Ilbert and S. Lauger and L. Tresse and V. Buat and S. Arnout and O. Le Fevre and D. Burgarella and E. Zucca and S. Bardelli and G. Zamorani and D. Bottini and B. Garilli and V. Le Brun and D. Maccagni and J. -P. Picat and R. Scaramella and M. Scodeggio and G. Vettolani and A. Zanichelli and C. Adami and M. Arnaboldi and M. Bolzonella and A. Cappi and S. Charlot and T. Contini and S. Foucaud and P. Franzetti and I. Gavignaud and L. Guzzo and A. Iovino and H. J. McCracken and B. Marano and C. Marinoni and G. Mathez and A. Mazure and B. Meneux and R. Merighi and S. Paltani and R. Pello and A. Pollo and L. Pozzetti and M. Radovich and M. Bondi and A. Bongiorno and G. Busarello and P. Ciliegi and Y. Mellier and P. Merluzzi and V. Ripepi and D. Rizzo},
journal= {arXiv preprint arXiv:astro-ph/0604010},
year = {2017}
}
备注
9 pages, 4 figures, 2 tables, accepted for publication in Astronomy and Astrophysics