Searching for massive clusters in weak lensing surveys

摘要: We explore the ability of weak lensing surveys to locate massive clusters. use both analytic models dark matter haloes and mock generated from a large cosmological N-body simulation. The describe average properties predict number counts, enabling us compute an effective survey selection function. argue that detectability depends not only on halo mass but also strongly redshift where is located. test model prediction for peak counts in maps against numerical data, find noise resulting intrinsic galaxy ellipticities causes systematic effect which increases counts. develop correction scheme empirical manner, show that, after correction, agrees well with data. data used examine completeness efficiency search by fully taking into account projection large-scale structures. detection threshold S/N = 4 ∼ 5 gives optimal balance between efficiency. Our results suggest density n g 30 arcmin -2 mean z 1, are expected cause signals above N balo (S/N > 4) 37 per 10 deg 2 , whereas 23 actually detected 4, giving as good 63 cent. Alternatively, peaks same area 62 4. Among peaks, caused height >4, 13 result 3 < remaining 26 either false or lower height. Therefore contamination rate 44 cent (this could be overestimation). Weak thus provide reasonably efficient way