%0 Generic
%A Gelsin, Alexander
%D 2015
%F heidok:18904
%K Kosmologie, Galaxienhaufen
%R 10.11588/heidok.00018904
%T Galaxy Cluster Detection using Optimal Matched Filtering in Optical Bands
%U https://archiv.ub.uni-heidelberg.de/volltextserver/18904/
%X The detection of galaxy clusters needs to be reliable and transparent in order to be relevant for cosmological purposes. In this work, a detection algorithm based on the optimal matched filtering technique is introduced and tested. For each of seven combinations of optical observables a filter type is constructed. Based on these filters signal-to-noise maps are computed on a redshift-mass grid. Given some signal-to-noise thresholds the expected detection completeness rates are computed for each filter type. It is concluded that the combination of all observables performs best. The completeness prediction for this filter choice is tested against numerical simulations. Because in this simulation field and cluster galaxies are produced separately also the contamination rate below 2 per square degree could be estimated. Completeness and purity rates for the detections are measured by relating detections to simulated clusters. The measured rates give insights into complications that can be within simulations and in the choice of limits and convolution scale of the filter. Lastly, the filter is applied to the W1m0p1 field from CARS. Resulting detections are reduced to 31 by merging. 15 Detections can be related to detections from  literature. It can hence be concluded that the filter may be applied to data.