GMASS ultradeep spectroscopy of galaxies at z ∼ 2 -: III.: The emergence of the color bimodality at z ∼ 2

被引：71

作者：

Cassata, P. ^{[1
]}

Cimatti, A. ^{[2
]}

Kurk, J. ^{[3
]}

Rodighiero, G. ^{[4
]}

Pozzetti, L. ^{[5
]}

Bolzonella, M. ^{[5
]}

Daddi, E. ^{[6
]}

Mignoli, M. ^{[5
]}

Berta, S. ^{[7
]}

Dickinson, M. ^{[8
]}

Franceschini, A. ^{[4
]}

Halliday, C. ^{[9
]}

Renzini, A. ^{[10
]}

Rosati, P. ^{[11
]}

Zamorani, G. ^{[5
]}

机构：

[1] Univ Aix Marseille 1, CNRS, UMR6110, OAMP,Lab Astrophys Marseille, F-13376 Marseille 12, France

[2] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[3] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[4] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[5] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[6] CEA Saclay, DSM, DAPNIA, Serv Astrophys, F-91191 Gif Sur Yvette, France

[7] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[8] NOAO Tucson, Tucson, AZ 85719 USA

[9] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[10] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[11] European So Observ, D-85748 Garching, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2008年 / 483卷 / 03期

关键词：

cosmology : observations; galaxies : fundamental parameters; galaxies : evolution; galaxies : formation;

D O I：

10.1051/0004-6361:200809881

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. The aim of this work is to study the evolution of the rest-frame color distribution of galaxies with the redshift, in particular in the critical interval 1.4 < z < 3. Methods. We combined ultradeep spectroscopy from the GMASS project (Galaxy Mass Assembly ultradeep Spectroscopic Survey) with GOODS multi-band photometry (from optical to mid-infrared) to study a sample of 1021 galaxies up to m(4.5 mu m) = 23. Results. We find that the distribution of galaxies in the (U - B) color vs. stellar mass plane is bimodal up to at least redshift z = 2. We define a "mass complete" sample of galaxies residing on the red sequence, selecting objects with log(M/M-circle dot) > 10.1, and we study their morphological and spectro-photometric properties. We show that the contribution to this sample of early-type galaxies, defined as galaxies with a spheroidal morphology and no star formation, decreases from 60-70% at z < 0.5 down to similar to 50% at redshift z = 2. At z > 2 we still find red galaxies in the mass complete sample, even if the bimodality is not seen any more. About 25% of these red galaxies at z > 2 are passively evolving, with the bulk of their stars formed at redshift z > 3.

引用

页码：L39 / L42

页数：4

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