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Minor Mergers and the Formation of Shell Galaxies

Published online by Cambridge University Press:  12 April 2016

V. Charmandaris  and
F. Combes
V. Charmandaris
Affiliation:
Observatoire de Paris, DEMIRM, 61 Ave. de l’Observatoire, F-75014, Paris, France
F. Combes
Affiliation:
Observatoire de Paris, DEMIRM, 61 Ave. de l’Observatoire, F-75014, Paris, France

Abstract

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We present a new mechanism which can explain the observed radial displacement between the stellar and gaseous shells observed around early type galaxies. Our model is based on the well-known phasewrapping process taking into account that a fraction of the interstellar medium is clumpy and consequently it experiences a low dynamical friction during a merging event. Moreover, our recent detection of cold molecular gas associated with the outer shells of Centaurus A is in agreement with the proposed model. This suggests that a considerable fraction of molecular gas in minor mergers may be distributed away from the nuclear regions and remain undetected.

Type
Part 3. Numerical Simulations
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 273 - 276
Copyright
Copyright © Astronomical Society of the Pacific 2000

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