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The Evolution of Passive Galaxies since z=1: Major Mergers vs Secular Processes

Published online by Cambridge University Press:  13 April 2010

Carlos López-Sanjuan ,
Marc Balcells ,
Pablo G. Pérez-González ,
Guillermo Barro ,
César Enrique García-Dabó ,
Jesús Gallego  and
Jaime Zamorano
Carlos López-Sanjuan
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain email: carlos.lopez@oamp.fr Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain Laboratoire d'Astrophysique de Marseille, 38, rue Frédéric Joliot-Curie, F-13388 Marseille cedex 13, France
Marc Balcells
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain email: carlos.lopez@oamp.fr Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain Isaac Newton Group of Telescopes, Aptdo. Correos 321, E-38700 Santa Cruz de La Palma, Tenerife, Spain
Pablo G. Pérez-González
Affiliation:
Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de C.C. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
Guillermo Barro
Affiliation:
Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de C.C. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
César Enrique García-Dabó
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain email: carlos.lopez@oamp.fr FRACTAL SLNE, C/ Tulipán 2, portal 13, 1 A, E-28231 Las Rozas, Madrid, Spain
Jesús Gallego
Affiliation:
Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de C.C. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
Jaime Zamorano
Affiliation:
Departamento de Astrofísica y Ciencias de la Atmósfera, Facultad de C.C. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain
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Abstract

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We study the evolution of the red sequence and the blue cloud since z ~ 1 to present in GOODS-S field for MB ≤ −20 and M* ≥ 1010M⊙ selected galaxies. We segregate the galaxies in early-type galaxies (ET, E/S0/Sa), and late-type galaxies (LT, Sb-Irr) by their position in the concentration-asymmetry plane, while in passive and star-forming by their rest-frame NUV – R color and their 24μm properties.

We find that red sequence (passive early types) comoving number density rise with cosmic time in both samples, while blue cloud (star-forming late types) number density descent in luminosity-selected samples and increase in mass-selected sample. We also find a third population that comprises star-forming early-type galaxies.

Comparing the observed evolution with the disk-disk (wet) major merger rate in GOODS-S, we infer that only ~20% of M* ≥ 1010M⊙ red sequence galaxies appeared since z = 1 can be explained by this kind of mergers, suggesting that minor mergers and secular evolution are the main processes in the red sequence evolution of M* ≥ 1010M⊙ galaxies since z ~ 1.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: interactions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 209 - 212
Copyright
Copyright © International Astronomical Union 2010

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