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Does the counter-streaming instability produce lopsided dE,Ns?

Published online by Cambridge University Press:  08 November 2005

Victor P. Debattista  and
Sven De Rijcke
Victor P. Debattista
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA 98195, USA email: debattis@astro.washington.edu
Sven De Rijcke
Affiliation:
Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, S9, B-9000, Gent, Belgium
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Abstract

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We present evidence that FCC 046, a dE,N galaxy with an offset nucleus, suffered a counter-streaming instability. This instability may explain the presence of lopsided nuclei in other dE,Ns if these galaxies are weakly rotating. The counter-streaming needed for the instability may result from the destruction of box orbits during the assembly of the nucleus.

Keywords

instabilitiesstellar dynamicsgalaxies: dwarfgalaxies: evolutiongalaxies: kinematics and dynamicsgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 173 - 176
Copyright
© 2005 International Astronomical Union