Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-24
Astronomy and Astrophysics
Astrophysics
Submitted to MNRAS (September, 18). 5 pages, 4 figures
Scientific paper
We investigate the density profiles and evolution of weakly self-interacting cold dark matter haloes using a numerical code based on the collisional Boltzmann equation. This approach is alternative to N-body techniques in following the dynamical evolution of haloes in the cosmological context and taking into account particle self-interaction. The physical case with a cross section inversely proportional to the relative velocity of the colliding particles is modelled with an unprecedented resolution, spanning five orders of magnitude on the radius for each halo. The modelled haloes cover a mass range from dwarf galaxies to galaxy clusters. We find that for \sigma v_{100} \approx 10^{-24} cm^2/GeV, where \sigma is the cross section per unit mass and v_{100} is the collision velocity in units of 100 km/s, soft cores in good agreement with observations on galactic as well as on galaxy cluster scales are obtained. Remarkably, the observed nearly invariance of the halo central density with mass is reproduced.
Brera O. di
Chincarini Guido
D'Onghia Elena
Firmani Claudio
Italy
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