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Where is the Light? Tracing the Evolution of Bulges and Disks since z ~ 0.8†

Published online by Cambridge University Press:  05 December 2011

Lidia A. M. Tasca  and
Laurence Tresse
Lidia A. M. Tasca
Affiliation:
Laboratoire d'Astrophysique de Marseille, CNRS-Université d'Aix-Marseille, 38 rue Frederic Joliot Curie, 13388 Marseille Cedex 13, France email: lidia.tasca@oamp.fr
Laurence Tresse
Affiliation:
Laboratoire d'Astrophysique de Marseille, CNRS-Université d'Aix-Marseille, 38 rue Frederic Joliot Curie, 13388 Marseille Cedex 13, France email: lidia.tasca@oamp.fr
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Abstract

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The chronology of galactic bulge and disk formation is studied by analysing the relative contributions of these components to the B band rest–frame luminosity density (LD) at two different cosmological epochs. The luminosity function (LF) of the bulge and disk components at z ~ 0.8 is computed on a galaxy subsample of the final zCOSMOS “bright” catalogue of roughly 20,000 objects with spectroscopic redshift in the COSMOS field. The comparison is then performed on galaxies in the local universe. Our preliminary results show that the LD in the disk component strongly decreases from ~ 80% at z ~ 0.8 to ~ 50% at z = 0, the bulges having a specular behaviour. The observational constraints provided in this work are aimed to discriminate among competing scenarios of galaxy formation and evolution. An appropriate comparison with hydrodynamical semianalytical models will be considered in a future study to understand further the formation and evolution of galaxies.

Keywords

galaxies: evolutiongalaxies: luminosity functiongalaxies:bulges
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S277: Tracing the Ancestry of Galaxies (on the land of our ancestors) , December 2010 , pp. 282 - 286
Copyright
Copyright © International Astronomical Union 2011

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