Volume 471, Number 3, September I 2007
|Page(s)||731 - 742|
|Section||Cosmology (including clusters of galaxies)|
|Published online||26 June 2007|
Testing the reliability of weak lensing cluster detections
ITA, Zentrum für Astronomie, Universität Heidelberg, Albert Überle Str. 2, 69120 Heidelberg, Germany e-mail: email@example.com
2 INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
3 Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, 40127 Bologna, Italy
4 INFN-National Institute for Nuclear Physics, Sezione di Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
5 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching bei Muenchen, Germany
Accepted: 9 June 2007
We study the reliability of dark-matter halo detections with three different linear filters applied to weak-lensing data. We use ray-tracing in the multiple lens-plane approximation through a large cosmological simulation to construct realizations of cosmic lensing by large-scale structures between redshifts zero and two. We apply the filters mentioned above to detect peaks in the weak-lensing signal and compare them with the true population of dark matter halos present in the simulation. We confirm the stability and performance of a filter optimised for suppressing the contamination by large-scale structure. It allows the reliable detection of dark-matter halos with masses above a few times with a fraction of spurious detections below ~. For sources at redshift two, 50% of the halos more massive than ~ are detected, and completeness is reached at ~.
Key words: cosmology: theory / dark matter / gravitational lensing
© ESO, 2007
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