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Discrepancies in cluster mass estimates,the case of MS 2137

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort  and
R. Gavazzi
R. Gavazzi*
Affiliation:
Observatoire Midi-Pyrénées, 14 Av. Edouard Belin, 31400 Toulouse, France
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Abstract

We revisit the density profile of the galaxies cluster MS 2137-23 bymodelling strong lensing, weak lensing data and the velocity dispersionprofile of the central cD galaxy. Though we are able to model thelensing properties with a NFW density profile, this latter modelcannot explain well the velocity dispersion nor the X-raysproperties. To accommodate all these independent constraints, one needsto go beyond the over-simplistic assumption of spherical symmetry. Thehigher mass and concentration inferred from lensing suggests that thedark matter halo is elongated along the line of sight. Themisalignment between the projected dark matter and stellar componentsalso supports this scenario. Neglecting projection effects leadsto systematic discrepancies between mass estimates. We thus argue thata fully triaxial modelling of haloes is a major concern for precision mass estimates.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 187 - 190
Copyright
© EAS, EDP Sciences, 2006

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