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Issue A&A
Volume 378, Number 3, November II 2001
Page(s) 748 - 755
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011178



A&A 378, 748-755 (2001)
DOI: 10.1051/0004-6361:20011178

Cluster mass profiles from weak lensing: The influence of substructure

L. J. King1, 2, P. Schneider1 and V. Springel2

1  Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, Bonn, Germany
2  Max Planck Institut für Astrophysik, Karl-Schwarzschild Str 1, Garching bei München, Germany

(Received 13 June 2001 / Accepted 22 August 2001)

Abstract
The tidal gravitational field of a cluster distorts the shapes of background galaxies. This signature can be used to place constraints on the mass profile of the cluster, using a maximum likelihood analysis to find the best-fit parameterised model. In Schneider et al. ([CITE]) and King & Schneider ([CITE]) we investigated how accurately parameters can be obtained, concentrating on smooth profiles. Here, we consider a realistic model for substructure in a cluster (from N-body simulations), in order to see what influence this has on the recovery of parameters. We find that for a typical cluster at $z_{\rm d}=0.2$, the presence of substructure increases the error on parameters recovered from weak lensing data by $\approx$3% . Even doubling the substructure amplitude induces only a $\approx$10% increase in the parameter dispersion: this bodes well for our method.


Key words: dark matter -- gravitational lensing -- large-scale structure of Universe -- galaxies: clusters: general -- methods: statistical

Offprint request: L. J. King, lindsay@astro.uni-bonn.de

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