The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties

M. Mignoli; G. Zamorani; M. Scodeggio; A. Cimatti; C. Halliday; S. J. Lilly; L. Pozzetti; D. Vergani; C. M. Carollo; T. Contini; O. Le Févre; V. Mainieri; A. Renzini; S. Bardelli; M. Bolzonella; A. Bongiorno; K. Caputi; G. Coppa; O. Cucciati; S. de la Torre; L. de Ravel; P. Franzetti; B. Garilli; A. Iovino; P. Kampczyk; J.-P. Kneib; C. Knobel; K. Kovač; F. Lamareille; J.-F. Le Borgne; V. Le Brun; C. Maier; R. Pellò; Y. Peng; E. Perez Montero; E. Ricciardelli; C. Scarlata; J. D. Silverman; M. Tanaka; L. Tasca; L. Tresse; E. Zucca; U. Abbas; D. Bottini; P. Capak; A. Cappi; P. Cassata; M. Fumana; L. Guzzo; A. Leauthaud; D. Maccagni; C. Marinoni; H. J. McCracken; P. Memeo; B. Meneux; P. Oesch; C. Porciani; R. Scaramella; N. Scoville

HAL : hal-00391212, version 1

arXiv : 0810.2245

Code Bibliographique ADS : 2009A&A...493...39M

DOI : 10.1051/0004-6361:200810520

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The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties
Mignoli M., Zamorani G., Scodeggio M., Cimatti A., Halliday C., Lilly S.J., Pozzetti L., Vergani D., Carollo C.M., Contini T. et al
Astronomy and Astrophysics 493 (2009) 39-49 - http://hal.archives-ouvertes.fr/hal-00391212

Type de publication :

Articles dans des revues avec comité de lecture

Domaine :

Planète et Univers/Astrophysique/Astrophysique galactique

Titre :

The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties

Auteur(s) :

M. Mignoli, G. Zamorani, M. Scodeggio, A. Cimatti, C. Halliday, S. J. Lilly, L. Pozzetti, D. Vergani, C. M. Carollo, T. Contini ¹, O. Le Févre ², V. Mainieri, A. Renzini, S. Bardelli, M. Bolzonella, A. Bongiorno, K. Caputi, G. Coppa, O. Cucciati, S. de la Torre ², L. de Ravel, P. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, J.-P. Kneib ², C. Knobel, K. Kovač, F. Lamareille ¹, J.-F. Le Borgne ¹, V. Le Brun ², C. Maier, R. Pellò ¹, Y. Peng, E. Perez Montero, E. Ricciardelli, C. Scarlata, J. D. Silverman, M. Tanaka, L. Tasca ², L. Tresse ², E. Zucca, U. Abbas, D. Bottini, P. Capak ³, A. Cappi, P. Cassata, M. Fumana, L. Guzzo, A. Leauthaud ², D. Maccagni, C. Marinoni ⁴, H. J. McCracken ⁵, P. Memeo, B. Meneux, P. Oesch, C. Porciani, R. Scaramella, N. Scoville ³

Laboratoire :

1 :	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)

	http://webast.ast.obs-mip.fr

	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III

	14, avenue Edouard Belin 31400 Toulouse

	France

2 :	Laboratoire d'Astrophysique de Marseille (LAM)

	http://www.oamp.fr/infoglueDeliverLive/www/LAM

	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I

	Pôle de l'Étoile Site de Château-Gombert 38, rue Frédéric Joliot-Curie 13388 Marseille cedex 13

	France

3 :	California Institute of Technology (Caltech)

	http://www.caltech.edu

	California Institute of Technology

	France

4 :	Centre de Physique Théorique (CPT)

	http://www.cpt.univ-mrs.fr

	CNRS : FR2291 – Université de Provence - Aix-Marseille I – Université de la Méditerranée - Aix-Marseille II – Université Sud Toulon Var

	CNRS Luminy case 907 13288 Marseille cedex 9

	France

5 :	Institut d'Astrophysique de Paris (IAP)

	http://www.iap.fr/

	CNRS : UMR7095 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI

	98bis, bd Arago - 75014 Paris France

	France

Résumé :

Aims. We investigate the relationships between three main optical galaxy observables (spectral properties, colors, and morphology), exploiting the data set provided by the COSMOS/zCOSMOS survey. The purpose of this paper is to define a simple galaxy classification cube, with a carefully selected sample of ≈1000 galaxies. Methods: Using medium resolution spectra of the first 1k zCOSMOS-bright sample, optical photometry from the Subaru/COSMOS observations, and morphological measurements derived from ACS imaging, we analyze the properties of the galaxy population out to z ~ 1. Applying three straightforward classification schemes (spectral, photometric, and morphological), we identify two main galaxy types, which appear to be linked to the bimodality of galaxy population. The three parametric classifications constitute the axes of a “classification cube”. Results: A very good agreement exists between the classification from spectral data (quiescent/star-forming galaxies) and the one based on colors (red/blue galaxies). The third parameter (morphology) is not as well correlated with the first two; in fact, a good correlation between the spectral classification and the classification based on morphological analysis (early-/late-type galaxies) is achieved only after partially complementing the morphological classification with additional color information. Finally, analyzing the 3D-distribution of all galaxies in the sample, we find that about 85% of the galaxies show a fully concordant classification, being either quiescent, red, bulge-dominated galaxies (~20%) or star-forming, blue, disk-dominated galaxies (~65%). These results imply that the galaxy bimodality is a consistent behavior both in morphology, color, and dominant stellar population, at least out to z ~ 1. Based on observations undertaken at the European Southern Observatory (ESO) Very Large Telescope (VLT) under Large Program 175.A-0839. Also based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, operated by AURA Inc., under NASA contract NAS 5-26555, with the Subaru Telescope, operated by the National Astronomical Observatory of Japan, with the telescopes of the National Optical Astronomy Observatory, operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation, and with the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France, and the University of Hawaii.

Langue du texte
intégral :

Anglais

Journal :

Astronomy and Astrophysics (Astron. Astrophys.)
Publisher	EDP Sciences
ISSN	0004-6361 (eISSN : 1432-0756)

Audience :

internationale

Date de publication :

01/2009

Volume :

493

Page, identifiant, ... :

39-49

Mots Clés :

galaxies: general – galaxies: evolution – galaxies: fundamental parameters

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0810.2245


hal-00391212, version 1
http://hal.archives-ouvertes.fr/hal-00391212
oai:hal.archives-ouvertes.fr:hal-00391212
Contributeur : Dominique Lullier <>
Soumis le : Mercredi 3 Juin 2009, 16:23:23
Dernière modification le : Mercredi 3 Juin 2009, 16:23:23