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Buckling Bars and Boxy Bulges

Published online by Cambridge University Press:  12 April 2016

M. R. Merrifield*
Affiliation:
Department of Physics, Southampton University, Southampton, SO17 1BJ, UK

Abstract

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It has been suggested that the peanut-shaped bulges seen in some edge-on disk galaxies are produced when bars in these galaxies buckle. This paper reviews the modelling which seeks to show how bars buckle, and I present a very simple new model which captures the essential physics of this process. I then discuss the problems in establishing observationally the connection between peanut-shaped bulges and bars. Confirmation of the link has proved difficult because boxy bulges are only apparent in edge-on galaxies whereas bars are only easily detectable in more face-on systems. Finally, I present a new technique which avoids this difficulty by searching for the distinctive kinematic signature of an edgeon bar; application of this method to spectra of peanut-shaped bulges reveals that they are, indeed, associated with hidden bars.

Type
Part IV. Observations of Barred Galaxies: Stellar Kinematics, Bulges, AGN
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Bettoni, D. & Galletta, G. 1994, A&A, 281, 1 Google Scholar
Bosma, A., Byun, Y., Freeman, K.C., & Athanassoula, E. 1992, ApJ, 400, L21 Google Scholar
Combes, F., Debbasch, F., Friedli, D. & Pfenniger, D. 1990, A&A, 233, 82 Google Scholar
Combes, F. & Sanders, R.H. 1981, A&A, 96, 164 Google Scholar
de Carvalho, R.R. & da Costa, L.N. 1987, A&A, 171, 66 Google Scholar
Dettmar, R.-J. & Barteldrees, A. 1990, in ESO/CTIO workshop on bulges of galaxies, 259 Google Scholar
Hunter, C. 1992, in Astrophysical Disks, Dermott, S.F., Hunter, J.H. & Wilson, R.E., New Yolk: New York Academy of Sciences, 22 Google Scholar
Jarvis, B.J. 1987, AJ, 94, 30 Google Scholar
Jarvis, B.J. 1990, in Heidelberg Conference on the Dynamics and interactions of galaxies, Wielen, R., Berlin: Springer-Verlag, 416 CrossRefGoogle Scholar
Kuijken, K. & Merrifield, M.R. 1993, MNRAS, 264, 712 Google Scholar
Kuijken, K. & Merrifield, M.R. 1995, ApJ, 443, L13 CrossRefGoogle Scholar
Merritt, D. & Sellwood, J.A. 1994, ApJ, 425, 551 Google Scholar
Pfenniger, D. & Friedli, D. 1991, A&A, 252, 75 Google Scholar
Raha, N., Sellwood, J.A., James, R.A., & Kahn, F.D. 1991, Nature, 352, 411 Google Scholar
Rowley, G. 1988, ApJ, 331, 124 CrossRefGoogle Scholar
Sellwood, J.A. & Wilkinson, A. 1993, Rep Prog Phys, 56, 173 Google Scholar
Shaw, M.A. 1987, MNRAS, 229, 691 Google Scholar
Sparke, L.S. & Sellwood, J.A. 1987, MNRAS, 225, 653 CrossRefGoogle Scholar