Shell Galaxies: Dynamical Friction, Gradual Satellite Decay and Merger Dating

Details Shell Galaxies: Dynamical Friction, Gradual Satellite Decay and Merger Dating Shell Galaxies: Dynamical Friction, Gradual Satellite Decay and Merger Dating

2009-08-26

arxiv.org/abs/0908.3742v1

ASP Conf.Ser.423:236,2010

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 3 figures, To appear in the Proceedings of the Galaxy Wars: Stellar Populations and Star Formation in Interacting Gal

Scientific paper

With the goal to refine modelling of shell galaxies and the use of shells to probe the merger history, we develop a new method for implementing dynamical friction in test-particle simulations of radial minor mergers. The friction is combined with a gradual decay of the dwarf galaxy. The coupling of both effects can considerably redistribute positions and luminosities of shells; neglecting them can lead to significant errors in attempts to date the merger.

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