Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..748k&link_type=abstract
Astronomy and Astrophysics, v.378, p.748-755 (2001)
Astronomy and Astrophysics
Astrophysics
16
Dark Matter, Gravitational Lensing, Large-Scale Structure Of Universe, Galaxies: Clusters: General, Methods: Statistical
Scientific paper
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{Schneider00}) and King & Schneider (\cite{King01&}) 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 zd=0.2, the presence of substructure increases the error on parameters recovered from weak lensing data by ~3%. Even doubling the substructure amplitude induces only a ~10% increase in the parameter dispersion: this bodes well for our method.
King Lindsay J.
Schneider Pat
Springel Volker
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