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Lost and found dark matter in elliptical galaxies

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort ,
F. Stoehr ,
G.A. Mamon ,
A. Dekel  and
T.J. Cox
F. Stoehr
Affiliation:
IAP, 98 bis Bd. Arago, 75014 Paris, France
G.A. Mamon
Affiliation:
IAP, 98 bis Bd. Arago, 75014 Paris, France
A. Dekel
Affiliation:
Hebrew University, Jerusalem, Israel
T.J. Cox
Affiliation:
Harvard-Smithsonian CfA, 60 Garden St, Cambridge, MA 02138, USA
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Abstract

The kinematical properties of elliptical galaxies formed during the mergersof equal mass, stars+gas+dark matter spiral galaxies are compared to theobserved low velocity dispersions found for planetary nebulae on the outskirts of ellipticals,which have been interpreted as pointing to a lack of dark matter inellipticals (which poses a problem for the standard model of galaxy formation).We find that the velocity dispersion profiles of the stars in thesimulated ellipticalsmatch well the observed ones.The low outer stellar velocity dispersions are mainly caused by the radialorbits of the outermost stars, which, for a given binding energy must havelow angular momentum to reach their large radial distances, usually driven out along tidal tails.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 135 - 138
Copyright
© EAS, EDP Sciences, 2006

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