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arXiv : 0907.5416

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zCOSMOS - 10k-bright spectroscopic sample. The bimodality in the Galaxy Stellar Mass Function: exploring its evolution with redshift

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

(30/07/2009)

We present the Galaxy Stellar Mass Function (GSMF) up to z~1 from the zCOSMOS-bright 10k spectroscopic sample. We investigate the total MF and the contribution of ETGs and LTGs, defined by broad-band SED, morphology, spectral properties or star formation activities. We unveil a galaxy bimodality in the global MF, at least up to the z~0.55, better represented by 2 Schechter functions dominated by ETGs and LTGs, respectively. For the global population we confirm that low-mass galaxies number density increases later and faster than for massive galaxies. We find that the MF evolution at intermediate-low Mstar (logM<10.6) is mostly explained by a growth in stellar mass driven by smooth and decreasing SFHs. The low/negligible evolution at higher Mstar sets a limit of 30-15%, decreasing with redshift, to the fraction of major merging. We find that ETGs increase in number density with cosmic time faster for decreasing Mstar, with a median "building redshift" increasing with mass, in contrast with hierarchical model predictions. For LTGs we find that the number density of blue or spiral galaxies remains almost constant with cosmic time from z~1. Instead, the most extreme population of active star forming galaxies is rapidly decreasing in number density. We suggest, firstly, a transformation from blue active spiral galaxies of intermediate mass into blue quiescent and successively (1-2 Gyr after) into red passive types. The complete morphological transformation into red spheroidal galaxies, required longer time-scales or follows after 1-2 Gyr. A continuous replacement of blue galaxies is expected by low-mass active spirals growing in stellar mass. We estimate that on average ~25% of blue galaxies is transforming into red per Gyr for logM<11. We expect a negligible evolution of the global Galaxy Baryonic MF. ABRIDGED

1 :	INAF- Osservatorio Astronomico di Bologna (INAF)
	INAF
2 :	Università di Bologna, Dipartimento di Astronomia
	Università degli studi di Bologna
3 :	Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Brera (INAF)
	Istituto Nazionale di Astrofisica
4 :	Autres
	AUTRE
5 :	Laboratoire d'Astrophysique de Marseille (LAM)
	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I
6 :	INAF, Osservatorio Astrofisico di Arcetri, Largo
	Osservatorio Astrofisico di ArcetI
7 :	Dipartimento di Fisica
	Università di Milano-Bicocca – Università degli studi di Milano
8 :	Laboratory for Climate Studies
	Laboratory for Climate Studies
9 :	Department of Physics and Astronomy
	University of California at Los Angeles
10 :	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)
	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III
11 :	INAF- Milano
	INAF
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 :	Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo)
	INAF
16 :	Space Telescope Science Institute (STSI)
	Space Telescope Science Institute
17 :	Centre de Physique Théorique (CPT)
	CNRS : FR2291 – Université de Provence - Aix-Marseille I – Université de la Méditerranée - Aix-Marseille II – Université Sud Toulon Var
18 :	Institut d'Astrophysique de Paris (IAP)
	CNRS : UMR7095 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI
19 :	California Institute of Technology (Caltech)
	California Institute of Technology

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Physique/Astrophysique/Phénomènes cosmiques de haute energie Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie

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Contributeur : Elizabeth Bernardo <>

Soumis le : Dimanche 4 Octobre 2009, 12:04:49

Dernière modification le : Dimanche 4 Octobre 2009, 12:04:49