INVESTIGADORES
PAZ Dante Javier
congresos y reuniones científicas
Título:
Anisotropic Halo Model
Autor/es:
SGRÓ, M. A; PAZ, D. J.; MERCHÁN, M. E.; RODRIGUEZ, F.
Lugar:
Florianópolis
Reunión:
Congreso; XIV Latin American Regional IAU Meeting; 2013
Institución organizadora:
Union Astronómica Internacional
Resumen:
We present an extended version of the classic halo model for the
large-scale matter distribution which includes a triaxial model for the
halo density profiles, a probabilistic distribution of the halo shape
and a probabilistic law describing the alignment of the surrounding
structure. In particular, we derive general expressions for the
halo-matter cross-correlation function. Using a Monte Carlo integration
method we obtain instances of the cross-correlation function depending
on the directions given by halo shape axes. These functions are called
anisotropic cross-correlations. We have found that our model is able to
reproduce the numerical measurements of those functions over a wide
range of scales, particularly in the 2-halo regime. The parameters of
the model obtained by fitting numerical results recover the well known
mass dependence of halo shapes and the alignment of dark matter halos
with the surrounding structure. In this sense, most massive halos tend
to have a less spherical shape and more prolate mass profile. In
addition, we have found that taking the triaxial nature of dark matter
halos into account improves at least %15 the predictions of the standard
halo model (as noted by others authors before). Finally, we are working
on the development of a similar model in order to compare theoretical
predictions with anisotropic correlation functions measured on galaxy
group catalogues. These results will appear in a forthcoming paper.