The 10k zCOSMOS: morphological transformation of galaxies in the group environment since z~1

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

HAL: hal-00421830, version 1

arXiv: 0909.2032

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The 10k zCOSMOS: morphological transformation of galaxies in the group environment since z~1

K. Kovac ¹, S. J. Lilly ¹, C. Knobel ¹, M. Bolzonella ², A. Iovino ¹, C. M. Carollo ³, C. Scarlata ¹, M. Sargent, O. Cucciati ⁴, G. Zamorani ¹, L. Pozzetti ⁵, L. A. M. Tasca ⁶, M. Scodeggio ⁷, P. Kampczyk ¹, Y. Peng ⁸, P. Oesch ¹, E. Zucca ⁹, A. Finoguenov ¹⁰, T. Contini ¹¹, J. -P. Kneib ¹¹, O. Le Fevre ⁶, V. Mainieri ¹, A. Renzini ¹, S. Bardelli ⁵, A. Bongiorno ², K. Caputi ¹, G. Coppa ¹, S. de la Torre ¹, L. de Ravel ¹, P. Franzetti ¹, B. Garilli ¹, F. Lamareille ¹¹, J. -F. Le Borgne ¹², V. Le Brun ⁶, C. Maier ¹, M. Mignoli ¹, R. Pello ¹¹, E. Perez Montero ¹³, E. Ricciardelli ¹, J. D. Silverman ¹, M. Tanaka ¹⁴, L. Tresse ⁶, D. Vergani ¹⁵, U. Abbas ¹, D. Bottini ¹, A. Cappi ¹⁶, P. Cassata ¹, A. Cimatti ¹, M. Fumana ¹, L. Guzzo ¹, A. M. Koekemoer ¹⁷, A. Leauthaud ⁶, D. Maccagni ¹, C. Marinoni ¹⁸, H. J. McCracken ¹⁹, P. Memeo ¹, B. Meneux ⁶, C. Porciani ¹, R. Scaramella ¹, N. Z. Scoville ²⁰

(2009-09-11)

We study the evolution of galaxies inside and outside of the group environment since z=1 using a large well defined set of groups and galaxies from the zCOSMOS-bright redshift survey in the COSMOS field. The fraction of galaxies with early-type morphologies increases monotonically with M_B luminosity and stellar mass and with cosmic epoch. It is higher in the groups than elsewhere, especially at later epochs. The emerging environmental effect is superposed on a strong global mass-driven evolution, and at z~0.5 and log(M*/Msol)~10.2, the "effect" of group environment is equivalent to (only) about 0.2 dex in stellar mass or 2 Gyr in time. The stellar mass function of galaxies in groups is enriched in massive galaxies. We directly determine the transformation rates from late to early morphologies, and for transformations involving colour and star formation indicators. The transformation rates are systematically about twice as high in the groups as outside, or up to 3-4 times higher correcting for infall and the appearance of new groups. The rates reach values, for masses around the crossing mass 10^10.5 Msol, as high as (0.3-0.7)/Gyr in the groups, implying transformation timescales of 1.4-3 Gyr, compared with less than 0.2/Gyr, i.e. timescales >5 Gyr, outside of groups. All three transformation rates decrease at higher stellar masses, and must decrease also at the lower masses below 10^10 Msol which we cannot well probe. The rates involving colour and star formation are consistently higher than those for morphology, by a factor of about 50%. Our conclusion is that the transformations which drive the evolution of the overall galaxy population since z~1 must occur at a rate 2-4 times higher in groups than outside of them.

1:	Autres

	AUTRE

2:	Università di Bologna, Dipartimento di Astronomia

	Università degli studi di Bologna

3:	The University of Chicago

	Dept of the Geophysical Sciences

4:	Dipartimento di Fisica

	Università di Milano-Bicocca – Università degli studi di Milano

5:	INAF- Osservatorio Astronomico di Bologna (INAF)

	INAF

6:	Laboratoire d'Astrophysique de Marseille (LAM)

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

7:	INAF- Milano

	INAF

8:	Laboratory for Climate Studies

	Laboratory for Climate Studies

9:	Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Brera (INAF)

	Istituto Nazionale di Astrofisica

10:	Max Planck Institut für Astronomie (MPIA)

	Max Planck Institut für Astronomie

11:	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)

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

12:	Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT)

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

13:	Glycosciences Laboratory

	Imperial College School of Medicine

14:	Tokai University

	Tokai University

15:	INAF, Osservatorio Astrofisico di Arcetri, Largo

	Osservatorio Astrofisico di ArcetI

16:	Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo)

	INAF

17:	Space Telescope Science Institute (STSI)

	Space Telescope Science Institute

18:	Centre de Physique Théorique (CPT)

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

19:	Institut d'Astrophysique de Paris (IAP)

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

20:	California Institute of Technology (Caltech)

	California Institute of Technology

Subject

Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics

Fulltext link:

http://fr.arXiv.org/abs/0909.2032


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From: Elizabeth Bernardo <>
Submitted on: Sunday, 4 October 2009 11:52:58
Updated on: Sunday, 4 October 2009 11:52:58