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On the formation mechanisms for ellipticals and bulges

Published online by Cambridge University Press:  07 August 2017

A.M. Fridman  and
V.L. Polyachenko
A.M. Fridman
Affiliation:
Institute of Astronomy, Moscow, Russia
V.L. Polyachenko
Affiliation:
Institute of Astronomy, Moscow, Russia

Abstract

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We study the formation of elliptical galaxies and the bulges of disk galaxies as a result of the collisionless collapse of a rotating star cloud. At small amounts of rotation, this process is accompanied by the bar mode of the radial orbit instability slightly modified by rotation. We refer this case to (giant) ellipticals. For moderate rotation, when the radial orbit instability is suppressed, another mode takes over, which is the direct continuation of a strongly damping mode at the limit of almost radial orbits; it turns into a practically non-damping and long-lived mode (for many revolutions), and even a slowly rotating bar may eventually be formed. It is natural to refer this case to bulges and dwarf elipticals. Then spirals could be formed from the clouds with large amounts of rotation.

Type
Contributed Papers
Information
Symposium - International Astronomical Union , Volume 153: Galactic Bulges , 1993 , pp. 377 - 380
Copyright
Copyright © Kluwer 1993 

References

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