The description of the abundance and clustering of haloes for non-Gaussian initial conditions has recently received renewed interest, motivated by the forthcoming large galaxy and cluster surveys, which can potentially yield constraints of the order of unity on the non-Gaussianity parameter f NL. We present tests on N-body simulations of analytical formulae describing the halo abundance and clustering for non-Gaussian initial conditions. We calibrate the analytic non-Gaussian mass function of Matarrese, Verde & Jimenez and LoVerde et al. and the analytic description of clustering of haloes for non-Gaussian initial conditions on N-body simulations. We find an excellent agreement between the simulations and the analytic predictions if we make the corrections and, where q â 0.75, in the density threshold for gravitational collapse and in the non-Gaussian fractional correction to the halo bias, respectively. We discuss the implications of this correction on present and forecasted primordial non-Gaussianity constraints. We confirm that the non-Gaussian halo bias offers a robust and highly competitive test of primordial non-Gaussianity. Â© 2009 RAS.
|Titolo:||Large-scale non-Gaussian mass function and halo bias: Tests on N-body simulations|
|Parole Chiave:||cosmology: theory; galaxies: clusters: general; galaxies: haloes; large-scale structure of universe; methods: n-body simulations; methods: statistical; space and planetary science; astronomy and astrophysics|
|Settore Scientifico Disciplinare:||Settore FIS/05 - Astronomia e Astrofisica|
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
|Data di pubblicazione:||set-2009|
|Digital Object Identifier (DOI):||10.1111/j.1365-2966.2009.15150.x|
|Appare nelle tipologie:||01 - Articolo su periodico|