Cluster detection in weak lensing surveys

Details Cluster detection in weak lensing surveys Cluster detection in weak lensing surveys

2008-10-06

arxiv.org/abs/0810.0781v1

Astronomy and Astrophysics

Astrophysics

12 pages, 14 figures

Scientific paper

We present an efficient and robust approach for extracting clusters of galaxies from weak lensing survey data and measuring their properties. We use simple, physically-motivated cluster models appropriate for such sparse, noisy data, and incorporate our knowledge of the cluster mass function to optimise the detection of low-mass objects. Despite the method's non-linear nature, we are able to search at a rate of approximately half a square degree per hour on a single processor, making this technique a viable candidate for future wide-field surveys. We quantify, for two simulated data-sets, the accuracy of recovered cluster parameters, and discuss the completeness and purity of our shear-selected cluster catalogues.

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