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The Growth of Bulges and Central Mass Concentrations by Dissipative Processes

Published online by Cambridge University Press:  03 August 2017

Daniel Pfenniger  and
Colin A. Norman
Daniel Pfenniger
Affiliation:
Geneva Observatory ch. des Maillettes 51 CH-1290 Sauverny Switzerland
Colin A. Norman
Affiliation:
Johns Hopkins University, and Space Telescope Science Institute Baltimore MD 21218 USA

Abstract

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The presence in the central few kpc of a disk galaxy of (1) a bar or a triaxial bulge, (2) a central mass concentration, and (3) a weak dissipation, make up the dynamical ingredients able to speed up considerably, (1) the thickening of the disk by vertical instabilities, and (2) the angular momentum losses, necessary to further accretion of mass. Some consequences compatible with observations are that bulges can be formed in large part after the disk formation phase, and that bars can be destroyed by a central mass concentration of about 109M⊙.

Type
IX- Galaxy Nuclei
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 323 - 326
Copyright
Copyright © Kluwer 1991 

References

1. Pfenniger, D., Norman, C.: 1990, Astrophys. J., Nov. 10, in press.Google Scholar
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3. Norman, C., Hasan, H.: 1990, Astrophys. J., Sep. 10, in press.Google Scholar
4. Friedli, D., Pfenniger, D.: these proceedings.Google Scholar