期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 402, 期 2, 页码 1049-1058出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15948.x
关键词
gravitational lensing; cosmological parameters; large-scale structure of Universe
资金
- Federal Ministry for Education and Research of Germany (BMBF) [TR33]
- DFG
- Deutsche Forschungsgemeinschaft [SCHN 342/6]
- Bonn-Cologne Graduate School of Physics and Astronomy
Weak-lensing searches for galaxy clusters are plagued by low completeness and purity, severely limiting their usefulness for constraining cosmological parameters with the cluster mass function. A significant fraction of 'false positives' are due to projection of large-scale structure and as such carry information about the matter distribution. We demonstrate that by constructing a 'peak function', in analogy to the cluster mass function, cosmological parameters can be constrained. To this end, we carried out a large number of cosmological N-body simulations in the Omega(m)-sigma(8) plane to study the variation of this peak function. We demonstrate that the peak statistics is able to provide constraints competitive with those obtained from cosmic-shear tomography from the same data set. By taking the full cross-covariance between the peak statistics and cosmic shear into account, we show that the combination of both methods leads to tighter constraints than either method alone can provide.
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