Scatter and bias in weak lensing selected clusters
  We examine scatter and bias in weak lensing selected clusters, employing both
an analytic model of dark matter haloes and numerical mock data of weak lensing
cluster surveys. We pay special attention to effects of the diversity of dark
matter distributions within clusters. We find that peak heights of the lensing
convergence map correlates rather poorly with the virial mass of haloes. The
correlation is tighter for the spherical overdensity mass with a higher mean
interior density. We examine the dependence of the halo shape on the peak
heights, and find that the rms scatter caused by the halo diversity scales
linearly with the peak heights with the proportionality factor of 0.1-0.2. The
noise originated from the halo shape is found to be comparable to the source
galaxy shape noise and the cosmic shear noise. We find the significant halo
orientation bias, i.e., weak lensing selected clusters on average have their
major axes aligned with the line-of-sight direction. We compute the orientation
bias using an analytic triaxial halo model and obtain results quite consistent
with the ray-tracing results. We develop a prescription to analytically compute
the number count of weak lensing peaks taking into account all the main sources
of scatters in peak heights. We find that the improved analytic predictions
agree well with the simulation results for high S/N peaks. We also compare the
expected number count with our weak lensing analysis results for 4 sq deg of
Subaru/Suprime-Cam observations and find a good agreement.
