Predicting the number, spatial distribution and merging history of dark matter haloes

Details Predicting the number, spatial distribution and merging history of dark matter haloes Predicting the number, spatial distribution and merging history of dark matter haloes

2001-09-19

arxiv.org/abs/astro-ph/0109322v1

Astronomy and Astrophysics

Astrophysics

9 pages, 6 eps figures included. ApJ, in press (1 January 2002) PINOCCHIO is available at http://www.daut.univ.trieste.it/pino

Scientific paper

10.1086/324182

We present a new algorithm (PINOCCHIO, PINpointing Orbit-Crossing Collapsed HIerarchical objects) to predict accurately the formation and evolution of individual dark matter haloes in a given realization of an initial linear density field. Compared with the halo population formed in a large (360^3 particles) collisionless simulation of a CDM universe, our method is able to predict to better than 10 per cent statistical quantities such as the mass function, two-point correlation function and progenitor mass function of the haloes. Masses of individual haloes are estimated accurately as well, with errors typically of order 30 per cent in the mass range well resolved by the numerical simulation. These results show that the hierarchical formation of dark matter haloes can be accurately predicted using local approximations to the dynamics when the correlations in the initial density field are properly taken into account. The approach allows one to automatically generate a large ensemble of accurate merging histories of haloes with complete knowledge of their spatial distribution. The construction of the full merger tree for a 256^3 realisation requires a few hours of CPU-time on a personal computer, orders of magnitude faster than the corresponding N-body simulation would take, and without needing any extensive post-processing. The technique can be efficiently used, for instance, for generating the input for galaxy formation modeling.

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