Issue |
A&A
Volume 471, Number 3, September I 2007
|
|
---|---|---|
Page(s) | 731 - 742 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20077217 | |
Published online | 26 June 2007 |
Testing the reliability of weak lensing cluster detections
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
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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