K+a galaxies in the zCOSMOS Survey: Physical properties of systems in their post-starburst phase

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

HAL : hal-00421831, version 1

arXiv : 0909.1968

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K+a galaxies in the zCOSMOS Survey: Physical properties of systems in their post-starburst phase

D. Vergani ¹, G. Zamorani ², S. J. Lilly ², F. Lamareille ³, C. Halliday, M. Scodeggio ⁴, C. Vignali ⁵, P. Ciliegi ⁶, M. Bolzonella ⁷, M. Bondi ⁶, K. Kovac ², C. Knobel ², E. Zucca ⁸, K. Caputi ², L. Pozzetti ⁶, S. Bardelli ⁶, M. Mignoli ², A. Iovino ², C. M. Carollo ⁹, T. Contini ³, J. -P. Kneib ³, O. Le Fevre ¹⁰, V. Mainieri ², A. Renzini ², A. Bongiorno ⁷, G. Coppa ², O. Cucciati ¹¹, S. de la Torre ², L. de Ravel ², P. Franzetti ², B. Garilli ², P. Kampczyk ², J. -F. Le Borgne ¹², V. Le Brun ¹⁰, C. Maier ², R. Pello ³, Y. Peng ¹³, E. Perez Montero ¹⁴, E. Ricciardelli ², J. D. Silverman ², M. Tanaka ¹⁵, L. Tasca ¹⁰, L. Tresse ¹⁰, U. Abbas ², D. Bottini ², A. Cappi ¹⁶, P. Cassata ², A. Cimatti ², L. Guzzo ², A. M. Koekemoer ¹⁷, A. Leauthaud D. Maccagni, C. Marinoni ¹⁸, H. J. McCracken ¹⁹, P. Memeo ², B. Meneux ¹⁰, P. Oesch ², C. Porciani ², R. Scaramella ², P. Capak ²⁰, D. Sanders ²¹, N. Scoville ²², Y. Taniguchi ²

(10/09/2009)

The identities of the main processes triggering and quenching star-formation in galaxies remain unclear. A key stage in evolution, however, appears to be represented by post-starburst galaxies. To investigate their impact on galaxy evolution, we initiated a multiwavelength study of galaxies with k+a spectral features in the COSMOS field. We examine a mass-selected sample of k+a galaxies at z=0.48-1.2 using the spectroscopic zCOSMOS sample. K+a galaxies occupy the brightest tail of the luminosity distribution. They are as massive as quiescent galaxies and populate the green valley in the colour versus luminosity (or stellar mass) distribution. A small percentage (<8%) of these galaxies have radio and/or X-ray counterparts (implying an upper limit to the SFR of ~8Msun/yr). Over the entire redshift range explored, the class of k+a galaxies is morphologically a heterogeneous population with a similar incidence of bulge-dominated and disky galaxies. This distribution does not vary with the strength of the Hdelta absorption line but instead with stellar mass in a way reminiscent of the well-known mass-morphology relation. Although k+a galaxies are also found in underdense regions, they appear to reside typically in a similarly rich environment as quiescent galaxies on a physical scale of ~2-8Mpc, and in groups they show a morphological early-to-late type ratio similar to the quiescent galaxy class. With the current data set, we do not find evidence of statistical significant evolution in either the number/mass density of k+a galaxies at intermediate redshift with respect to the local values, or the spectral properties. Those galaxies, which are affected by a sudden quenching of their star-formation activity, may increase the stellar mass of the red-sequence by up to a non-negligible level of ~10%.

1 :	INAF, Osservatorio Astrofisico di Arcetri, Largo

	Osservatorio Astrofisico di ArcetI

2 :	Autres

	AUTRE

3 :	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)

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

4 :	INAF- Milano

	INAF

5 :	Dipartimemto di Astronomia, Universita degli Studi di Bologna

	Università degli studi di Bologna

6 :	INAF- Osservatorio Astronomico di Bologna (INAF)

	INAF

7 :	Università di Bologna, Dipartimento di Astronomia

	Università degli studi di Bologna

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

	Istituto Nazionale di Astrofisica

9 :	The University of Chicago

	Dept of the Geophysical Sciences

10 :	Laboratoire d'Astrophysique de Marseille (LAM)

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

11 :	Dipartimento di Fisica

	Università di Milano-Bicocca – Università degli studi di Milano

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

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

13 :	Laboratory for Climate Studies

	Laboratory for Climate Studies

14 :	Glycosciences Laboratory

	Imperial College School of Medicine

15 :	Tokai University

	Tokai University

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 :	Max Planck Institut für Astronomie (MPIA)

	Max Planck Institut für Astronomie

21 :	Materials & Process technology

	BOEING Company

22 :	California Institute of Technology (Caltech)

	California Institute of Technology

Domaine

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0909.1968


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Soumis le : Dimanche 4 Octobre 2009, 11:55:52
Dernière modification le : Dimanche 4 Octobre 2009, 11:55:52