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Title:
Formation of Boxy/Peanut-Shaped Bulges in Spiral Galaxies: Accretion or Bar Instability?
Authors:
Bureau, M.; Freeman, K. C.
Affiliation:
AA(Mount Stromlo and Siding Spring Observatories, The Australian National University, Australia, ), AB(Mount Stromlo and Siding Spring Observatories, The Australian National University, Australia, )
Publication:
Galaxy Interactions at Low and High Redshift, Proceedings of IAU Symposium #186, held at Kyoto, Japan, 26-30 August, 1997. Edited by J. E. Barnes, and D. B. Sanders, 1999., p.193
Publication Date:
00/1999
Origin:
AUTHOR
Bibliographic Code:
1999IAUS..186..193B

Abstract

We present results of an observational program aimed at identifying the formation mechanism of boxy/peanut-shaped bulges in spiral galaxies. We concentrate on the accretion and bar-buckling scenarios and show that although satellites accretion is an attractive way to form boxy/peanut bulges, the bar-buckling instability is more likely to be the true cause of the bulges shape in the vast majority of cases. Nevertheless, some objects do not harbour a bar and others are clearly interacting, so the accretion mechanism could be relevant in some systems and the possibility of hybrid scenarios must be raised. The related X-shaped galaxies are also discussed.

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