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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27001
Title: Fast weak-lensing simulations with halo model
Authors: GIOCOLI, CARLO
Di Meo, Sandra
MENEGHETTI, MASSIMO 
Jullo, Eric
de la Torre, Sylvain
MOSCARDINI, LAURO
BALDI, MARCO
Mazzotta, Pasquale
Metcalf, R. Benton
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 470
Issue: 3
First Page: 3574
Abstract: Full ray-tracing maps of gravitational lensing, constructed from N-body simulations, represent a fundamental tool to interpret present and future weak-lensing data. However, the limitation of computational resources and storage capabilities severely restricts the number of realizations that can be performed in order to accurately sample both the cosmic shear models and covariance matrices. In this paper, we present a halo model formalism for weak gravitational lensing that alleviates these issues by producing weak-lensing mocks at a reduced computational cost. Our model takes as input the halo population within a desired light cone and the linear power spectrum of the underlined cosmological model. We examine the contribution given by the presence of substructures within haloes to the cosmic shear power spectrum and quantify it to the percent level. Our method allows us to reconstruct high-resolution convergence maps, for any desired source redshifts, of light cones that realistically trace the matter density distribution in the universe, account for masked area and sample selections. We compare our analysis on the same large-scale structures constructed using ray-tracing techniques and find very good agreements in both the linear and non-linear regimes up to few percent levels. The accuracy and speed of our method demonstrate the potential of our halo model for weak-lensing statistics and the possibility to generate a large sample of convergence maps for different cosmological models as needed for the analysis of large galaxy redshift surveys.
URI: http://hdl.handle.net/20.500.12386/27001
URL: https://academic.oup.com/mnras/article-abstract/470/3/3574/3862547?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stx1399
Bibcode ADS: 2017MNRAS.470.3574G
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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