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Harassment origin for kinematic substructures in dwarf elliptical galaxies?

AuthorsGonzález-García, A. César ; Aguerri, J. A. L.; Balcells, Marc
Keywordsgalaxies: dwarf
galaxies: interactions
galaxies: kinematics and dynamics
galaxies: structure
methods: N-body simulations
Issue Date4-Dec-2005
PublisherEDP Sciences
CitationAstronomy & Astrophysics, 444 (3): 803-812. Les Ulis Cedex
Abstract[EN]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.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361:20052670
Appears in Collections:(INCIPIT) Artículos
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