Harassment Origin for Kinematic Substructures in Dwarf Elliptical Galaxies?

Details Harassment Origin for Kinematic Substructures in Dwarf Elliptical Galaxies? Harassment Origin for Kinematic Substructures in Dwarf Elliptical Galaxies?

2005-08-29

arxiv.org/abs/astro-ph/0508610v1

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures; Accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20052670

We have run high resolution N-body models simulating the encounter of a dwarf galaxy with a bright elliptical galaxy. The dwarf absorbs orbital angular momentum and shows counter-rotating features in the external regions of the galaxy. To explain the core-envelope kinematic decoupling observed in some dwarf galaxies in high-density environments requires nearly head-on collisions and very little dark matter bound to the dwarf. These kinematic structures appear under rather restrictive conditions. As a consequence, in a cluster like Virgo ~1% of dwarf galaxies may present counter-rotation formed by harassment.

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