Issue |
A&A
Volume 501, Number 1, July I 2009
|
|
---|---|---|
Page(s) | 21 - 27 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/200810511 | |
Published online | 05 May 2009 |
The Vimos VLT Deep Survey*
Stellar mass segregation and large-scale galaxy environment in the redshift range 0.2
1.4
1
INAF IASF – Milano, via Bassini 15, 20133 Milano, Italy e-mail: marcos@lambrate.inaf.it
2
Università di Bologna, Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
3
INAF – Osservatorio Astronomico di Brera, via Brera 28, 20021 Milan, Italy
4
Universitá di Milano-Bicocca, Dipartimento di Fisica, Piazza delle Scienze 3, 20126 Milano, Italy
5
Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Av. E. Belin, 31400 France,
6
INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
7
Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS-Université de Provence, BP 8, 13376 Marseille Cedex 12, France
8
INAF – Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy
9
Centre de Physique Théorique, UMR 6207 CNRS-Université de Provence, 13288 Marseille, France
10
IRA – INAF, via Gobetti 101, 40129 Bologna, Italy
11
INAF – Osservatorio Astronomico di Roma, via di Frascati 33, 00040, Monte Porzio Catone, Italy
12
Canada France Hawaii Telescope corporation, Mamalahoa Hwy, Kamuela, HI-96743, USA
13
Institut d'Astrophysique de Paris, UMR 7095, 98 bis Bvd Arago, 75014 Paris, France
14
Max Planck Institut für Astrophysik, 85741 Garching, Germany
15
School of Physics & Astronomy, University of Nottingham, University Park, Nottingham, NG72RD, UK
16
Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
17
Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, Hawaii 96822, USA
18
Observatoire de Paris, LERMA, 61 Av. de l'Observatoire, 75014 Paris, France
19
Max Planck Institut für Extraterrestrische Physik (MPE), Giessenbachstrasse 1, 85748 Garching bei München, Germany
20
Universitätssternwarte München, Scheinerstrasse 1, 81679 München, Germany
21
Integral Science Data Centre, ch. d'Écogia 16, 1290 Versoix, Switzerland
22
Geneva Observatory, ch. des Maillettes 51, 1290 Sauverny, Switzerland
23
The Andrzej Soltan Institute for Nuclear Research, ul. Hoza 69, 00-681 Warszawa, Poland
24
Astronomical Observatory of the Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland
25
INAF – Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
26
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
27
Leiden Observatory, Leiden University, Postbus 9513, 2300 RA, Leiden, The Netherlands
28
Institute of Astro- and Particle Physics, Leopold-Franzens-University Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
Received:
3
July
2008
Accepted:
23
February
2009
Context. Hierarchical models of galaxy formation predict that the properties of a dark matter halo depend on the large-scale environment surrounding the halo. As a result of this correlation, we expect massive haloes to be present in larger number in overdense regions than in underdense ones. Given that a correlation exists between a galaxy stellar mass and the hosting dark matter halo mass, the segregation in dark matter halo mass should then result in a segregation in the distribution of stellar mass in the galaxy population.
Aims. In this work we study the distribution of galaxy stellar mass and rest-frame optical color as a function of the large-scale galaxy distribution using the VLT VIMOS Deep Survey sample, in order to verify the presence of segregation in the properties of the galaxy population.
Methods. We use VVDS redshift measurements and multi-band photometric data to derive
estimates of the stellar mass, rest-frame optical color, and of the large-scale
galaxy density, on a scale of approximately 8 Mpc, for a sample of 5619 galaxies in
the redshift range .
Results. We observe a significant mass and optical color segregation over the whole redshift
interval covered by our sample, such that the median value of the mass distribution is
larger and the rest-frame optical color is redder in regions of high galaxy density.
The amplitude of the mass segregation changes little with redshift, at least in the
high stellar mass regime that we can uniformly sample over the redshift
interval. The color segregation, instead, decreases significantly for
. However,
when we consider only galaxies in narrow bins of stellar mass, in order to exclude the
effects of stellar mass segregation on galaxy properties, we no longer observe any
significant color segregation.
Key words: galaxies: formation / galaxies: evolution / galaxies: fundamental parameters / cosmology: observations
© ESO, 2009
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