A Weak Interaction Model for Shell Galaxies

Details A Weak Interaction Model for Shell Galaxies A Weak Interaction Model for Shell Galaxies

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..122t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 247, NO. 1/NOV1, P. 122, 1990

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38

Scientific paper

We describe numerical simulations which show the formation of shell structures in spherical galaxy systems. The model simulates the interaction of a primary galaxy of test particles with another galaxy. The test-particle orbits are initially near-circular (but not coplanar) and the effect of changing the perigalactic distance of the encounter, the secondary mass, and heating the particles (by adding random motions) is described. Our results show that shell structures, similar to those observed in many elliptical galaxies, can be formed by this process, and remain visible for about 10^10^ yr. If this model is correct, then it implies that (at least some) elliptical galaxies have thick discs and that the underlying galaxies are predominantly oblate spheroids.

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