Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-27
Astrophys.J.575:640-649,2002
Astronomy and Astrophysics
Astrophysics
11 pages, 11 figures; Changed to match version accepted by ApJ. Simulation results updated. Conclusions unchanged
Scientific paper
10.1086/341351
Using mock observations of numerical simulations, we investigate the completeness and efficiency of searches for galaxy clusters in weak lensing surveys. While it is possible to search for high mass objects directly as density enhancements using weak lensing, we find that line-of-sight projection effects can be quite serious. For the search methods that we consider, to obtain high completeness requires acceptance of a very high false-positive rate. The false positive rate can be reduced only by significantly degrading the completeness. Both completeness and efficiency are dependent upon the filter used in the search and the desired mass threshold, emphasizing that a measurement of the 3D mass function from gravitational lensing is affected by a number of biases which mix `cosmological' and observational issues.
Mackey Jonathan
Waerbeke Ludovic Van
White Martin
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