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Title:
The Evolution of Early- and Late-type Galaxies in the Cosmic Evolution Survey up to z ≈ 1.2
Authors:
Pannella, Maurilio; Gabasch, Armin; Goranova, Yuliana; Drory, Niv; Hopp, Ulrich; Noll, Stefan; Saglia, Roberto P.; Strazzullo, Veronica; Bender, Ralf
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ; National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801-0387, USA ; ), AB(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ; European Southern Observatory, Karl Schwarzschild Strasse 2, Garching bei München, Germany ), AC(Universitätssternwarte München, Scheinerstrasse 1, D-81673 München, Germany ; UPMC Univ. Paris 06, UMR7095, Institut d'Astrophysique de Paris, F-75014, Paris, France ; CNRS, UMR7095, Institut d'Astrophysique de Paris, F-75014, Paris, France ; Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee Boulevard, 1784 Sofia, Bulgaria ), AD(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ), AE(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ; Universitätssternwarte München, Scheinerstrasse 1, D-81673 München, Germany ), AF(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ; Observatoire Astronomique de Marseille-Provence (OAMP), 38 rue Frédéric Joliot-Curie, 13388 Marseille cedex 13, France), AG(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ), AH(National Radio Astronomy Observatory, P.O. Box 0, Socorro, NM 87801-0387, USA ), AI(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, Postfach 1312, D-85741 Garching bei München, Germany ; Universitätssternwarte München, Scheinerstrasse 1, D-81673 München, Germany )
Publication:
The Astrophysical Journal, Volume 701, Issue 1, pp. 787-803 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
galaxies: evolution, galaxies: fundamental parameters, galaxies: luminosity function, mass function, galaxies: statistics, surveys
DOI:
10.1088/0004-637X/701/1/787
Bibliographic Code:
2009ApJ...701..787P

Abstract

The Cosmic Evolution Survey (COSMOS) allows for the first time a highly significant census of environments and structures up to redshift 1, as well as a full morphological description of the galaxy population. In this paper we present a study aimed to constrain the evolution, in the redshift range 0.2 < z < 1.2, of the mass content of different morphological types and its dependence on the environmental density. We use a deep multicolor catalog, covering an area of ~0.7 deg2 inside the COSMOS field, with accurate photometric redshifts (i \mathrel {\rlap{\lower4pt\\sim }\raise1pt\<} 26.5 and Δz/(z spec + 1) ≈ 0.035). We estimate galaxy stellar masses by fitting the multicolor photometry to a grid of composite stellar population models. We quantitatively describe the galaxy morphology by fitting point-spread function convolved Sérsic profiles to the galaxy surface brightness distributions down to F814 = 24 mag for a sample of 41,300 objects. We confirm an evolution of the morphological mix with redshift: the higher the redshift the more disk-dominated galaxies become important. We find that the morphological mix is a function of the local comoving density: the morphology density relation extends up to the highest redshift explored. The stellar mass function of disk-dominated galaxies is consistent with being constant with redshift. Conversely, the stellar mass function of bulge-dominated systems shows a decline in normalization with redshift. Such different behaviors of late-types and early-types stellar mass functions naturally set the redshift evolution of the transition mass. We find a population of relatively massive, early-type galaxies, having high specific star formation rate (SSFR) and blue colors which live preferentially in low-density environments. The bulk of massive (>7 × 1010 M sun) early-type galaxies have similar characteristic ages, colors, and SSFRs independently of the environment they belong to, with those hosting the oldest stars in the universe preferentially belonging to the highest density regions. The whole catalog including morphological information and stellar mass estimates analyzed in this work is made publicly available.

Based on observations made with the Advanced Camera for Surveys on board the NASA/ESA Hubble Space Telescope (GO Proposal 9822).

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