IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
How accurate is it to update the cosmology of your halo catalogues?
Autor/es:
RUIZ, ANDRÉS NICOLÁS; PADILLA, NELSON DAVID; DOMÍNGUEZ, MARIANO JAVIER; CORA, SOFÍA ALEJANDRA
Revista:
Monthly Notices of the Royal Astronomical Society
Editorial:
Wiley-Blackwell
Referencias:
Año: 2011 vol. 418 p. 2422 - 2434
ISSN:
0035-8711
Resumen:
We test and present the application of the full rescaling method by Angulo & White to change the cosmology of halo catalogues in numerical simulations for cosmological parameter search using semi-analytic galaxy properties. We show that a reduced form of the method can be applied to small simulations with box side of ~50 h^{-1} Mpc or smaller without loss of accuracy. We perform statistical tests on the accuracy of the properties of rescaled individual haloes, and also on the rescaled population as a whole. We find that individual positions and velocities are recovered with almost no detectable biases, but with a scatter that increases slightly with the size of the simulation box when using the full method. The dispersion in the recovered halo mass does not seem to depend on the resolution of the simulation. Regardless of the halo mass, the individual accretion histories, spin parameter evolution and fraction of mass in substructures are remarkably well recovered. In particular, in order to obtain a more accurate estimate of the halo virial mass, it was necessary to apply an additional correction due to the change in the virial overdensity and the estimate of its effect on a Navarro, Frenk & White (NFW) virial mass. The mass of rescaled haloes can be underestimated (overestimated) for negative (positive) variations of either σ8 or OmegaM, in a way that does not depend on the halo mass. Statistics of abundances and correlation functions of haloes also show small biases of