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The z = 0.8 precursors of today's bulges

Published online by Cambridge University Press:  01 July 2007

Marc Balcells  and
Lilian Domínguez-Palmero
Marc Balcells
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
Lilian Domínguez-Palmero
Affiliation:
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
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Abstract

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We study the color structure of disk galaxies in the Groth strip at redshifts 0.1 < z < 1.2. Our aim is to test formation models in which bulges form before/after the disk. We find smooth color distributions with gentle outward blueing across the galaxy image: bulges are not distinctly redder than their disks; and bulge colors strongly correlate with global colors. The results suggest a roughly coeval evolution of bulges and disks. About 50% of the nuclei of galaxies with central light excesses above the outer exponential profile hold passively evolving red populations. The remainder 50% are galaxies with central blue colors similar to their disks. They may be bulges in formation, or the central parts of disks with non-exponential surface brightness profiles.

Keywords

galaxies: evolutiongalaxies: colorsgalaxies: bulges
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 439 - 442
Copyright
Copyright © International Astronomical Union 2008

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