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Bar dissolution and bulge formation

Published online by Cambridge University Press:  25 May 2016

C.A. Norman
Affiliation:
Space Telescope Science Institute and Johns Hopkins University, Baltimore, MD 21218, U.S.A.
H. Hasan
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, U.S.A.
J.A. Sellwood
Affiliation:
Dept. of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855-0849, U.S.A.

Extract

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We discuss the general classification of secular evolution in galaxies into terms of stellar dynamics. We present two-dimensional N-body simulations of a disk galaxy in which a central mass concentration is imposed after the formation of a strong bar. We show that the bar dissolves almost completely if the central mass concentration exceeds approximately 5% of the combined disk and bulge mass. This behavior can be understood in terms of previous work on single particle orbits (Hasan & Norman 1990, Hasan et al. 1993); the sustaining orbits aligned with the bar become stochastic as the Inner Lindblad resonance moves out past the minor axis of the bar. We present arguments that bar formation and subsequent thickening and dissolution will create a bulge-like stellar distribution from the central part of the disk. We discuss the predictions of such a model including the point that barred Scs with sufficient central mass concentrations should be building bulges now. We emphasize that bulges can come from a number of different mechanisms and we discuss the current evidence at both high and low redshift.

Type
Poster Papers
Copyright
Copyright © Kluwer 1996 

References

Hasan, H. and Norman, C., 1990, ApJ 361, 69.Google Scholar
Hasan, H., Pfenniger, D. and Norman, C., 1993, ApJ, 409, 91.CrossRefGoogle Scholar