EDP Sciences
Free Access
Volume 378, Number 3, November II 2001
Page(s) 748 - 755
Section Extragalactic astronomy
DOI https://doi.org/10.1051/0004-6361:20011178
Published online 15 November 2001

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)

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

SIMBAD Objects

© ESO 2001

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.