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2011

Cosmological Information in Weak Lensing Peaks

Yang, Xiuyuan, Kratochvil, Jan M., Wang, Sheng et al.

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Recent studies have shown that the number counts of convergence peaks N(kappa) in weak lensing (WL) maps, expected from large forthcoming surveys, can be a useful probe of cosmology.

We follow up on this finding, and use a suite of WL convergence maps, obtained from ray-tracing N-body simulations, to study (i) the physical origin of WL peaks with different heights, and (ii) whether the peaks contain information beyond the convergence power spectrum P_ell.
In agreement with earlier work, we find that high peaks (with amplitudes >~ 3.5 sigma, where sigma is the r.m.s.
of the convergence kappa) are typically dominated by a single massive halo.

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