## Abstract

^{2}field. We measure the abundance of peaks identified in aperture mass maps, as a function of their signal-to-noise ratio, in the signal-to-noise range 0<S/N<40<S/N<4. To predict the peak counts as a function of cosmological parameters, we use a suite of

*N*-body simulations spanning 158 models with varying Ω

_{m}and σ

_{8}, fixing

*w*= −1, Ω

_{b}= 0.04,

*h*= 0.7 and

*n*

_{s}= 1, to which we have applied the DES SV mask and redshift distribution. In our fiducial analysis we measure σ

_{8}(Ω

_{m}/0.3)

^{0.6}= 0.77 ± 0.07, after marginalizing over the shear multiplicative bias and the error on the mean redshift of the galaxy sample. We introduce models of intrinsic alignments, blending and source contamination by cluster members. These models indicate that peaks with S/N>4S/N>4 would require significant corrections, which is why we do not include them in our analysis. We compare our results to the cosmological constraints from the two-point analysis on the SV field and find them to be in good agreement in both the central value and its uncertainty. We discuss prospects for future peak statistics analysis with upcoming DES data.

Original language | English |
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Pages (from-to) | 3653-3673 |

Number of pages | 21 |

Journal | Monthly Notices of the Royal Astronomical Society |

Volume | 463 |

Early online date | 19 Aug 2016 |

DOIs | |

Publication status | Published - Dec 2016 |

## Keywords

- astro-ph.CO
- RCUK
- STFC
- gravitational lensing: weak
- methods: data analysis
- methods: statistical
- cosmological parameter
- cosmology: observations
- dark matter