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Nature of bulges in the Hubble sequence

Published online by Cambridge University Press:  01 July 2007

Eija Laurikainen ,
H. Salo ,
R. Buta  and
J. H. Knapen
Eija Laurikainen
Affiliation:
Division of Astronomy, Dept. of Phys. Sci., Univ. of Oulu, Finland email: eija.laurikainen@oulu.fi
H. Salo
Affiliation:
Division of Astronomy, Dept. of Phys. Sci., Univ. of Oulu, Finland email: eija.laurikainen@oulu.fi
R. Buta
Affiliation:
Department of Physics and Astronomy, Univ. of Alabama, USA
J. H. Knapen
Affiliation:
Instituto de Astrofisica de Canarias, E-38200, La Laguna, Spain
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Abstract

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We evaluate the nature of bulges in the Hubble sequence, based on an analysis of 216 disk galaxies of all morphological types (S0-Sd). For this purpose we collect our various analysis made separately for early and late-type galaxies, published in a series of papers. Using the criteria by Kormendy & Kennicutt we find strong evidence of pseudobulges in all Hubble types, including S0s. However, due to the relatively massive bulges in S0-S0/a galaxies it is not probable that the (pseudo)bulges in these galaxies were formed in a similar manner as in spirals. More likely, pseudobulges particularly in strongly barred early-type disk galaxies are suggested to be a combination of star formation and the nearly exponential central components of bars.

Keywords

galaxies: structuregalaxies: bulgesgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 309 - 310
Copyright
Copyright © International Astronomical Union 2008

References

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