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The coexistence of classical bulges and disky pseudobulges in early-type disk galaxies

Published online by Cambridge University Press:  01 July 2007

Peter Erwin
Peter Erwin*
Affiliation:
Max-Planck-Insitut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany email: erwin@mpe.mpg.de Universitäts-Sternwarte München, Scheinerstrasse 1, 81679 München, Germany
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Abstract

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Close examination of “pseudobulges” in several early-type disk galaxies indicates that they are actually composite structures consisting of both a flattened, kinematically cool disklike structure (“disky pseudobulge”) and a rounder, kinematically hot spheroidal structure (“classical bulge”). This indicates that pseudobulges, thought to form from internal secular evolution, and classical bulges, thought to form from rapid mergers, are not exclusive phenomena: some galaxies can have both.

Keywords

galaxies: bulgesgalaxies: elliptical and lenticularcDgalaxies: structuregalaxies: individual (NGC 4371)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 113 - 116
Copyright
Copyright © International Astronomical Union 2008

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