Free access article

Issue A&A Volume 418, Number 2, May I 2004 Page(s) 413 - 418 Section Cosmology (including clusters of galaxies) DOI 10.1051/0004-6361:20035763

A&A 418, 413-418 (2004)
DOI: 10.1051/0004-6361:20035763

Do arcs require flat halo cusps?

M. Bartelmann¹ and M. Meneghetti<sup>2

1</sup>  ITA, Universität Heidelberg, Tiergartenstr. 15, 69121 Heidelberg, Germany
²  Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy

(Received 28 November 2003 / Accepted 6 February 2004)

Abstract
It was recently claimed that several galaxy clusters containing radial and tangential gravitational arcs and having a measured velocity-dispersion profile for the brightest cluster galaxy had to have central density profiles considerably flatter than those found in CDM cluster simulations. Using a simple analytic mass model, we confirm this result for axially symmetric mass distributions. However, we demonstrate that steep density profiles are well in agreement with the cluster requiring the flattest axially symmetric profile once even small deviations from axial symmetry are introduced.

Key words: gravitational lensing -- galaxies: clusters: general -- cosmology: dark matter

Offprint request: M. Bartelmann, mbartelmann@ito.uni-heidelberg.de

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