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Issue A&A
Volume 471, Number 3, September I 2007
Page(s) 731 - 742
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20077217



A&A 471, 731-742 (2007)
DOI: 10.1051/0004-6361:20077217

Testing the reliability of weak lensing cluster detections

F. Pace1, M. Maturi1, M. Meneghetti2, M. Bartelmann1, L. Moscardini3, 4, and K. Dolag5

1  ITA, Zentrum für Astronomie, Universität Heidelberg, Albert Überle Str. 2, 69120 Heidelberg, Germany
    e-mail: francesco@ita.uni-heidelberg.de
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

(Received 1 February 2007 / Accepted 9 June 2007 )

Abstract
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 $10^{13}\,h^{-1}\,M_\odot$ with a fraction of spurious detections below ~$10\%$. For sources at redshift two, 50% of the halos more massive than ~ $7\times10^{13}\,h^{-1}\,M_\odot$ are detected, and completeness is reached at ~ $2\times10^{14}\,h^{-1}\,M_\odot$.


Key words: cosmology: theory -- dark matter -- gravitational lensing



© ESO 2007


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