Mini-halo disruption due to encounters with stars

摘要: We study, analytically and numerically, the energy input into dark matter mini-haloes by interactions with stars. find that fractional in simulations of Plummer spheres agrees well impulse approximation for small large impact parameters, a rapid transition between these two regimes. Using at parameters is fairly independent mass density profile mini-halo, however low-mass experience greater close encounters. formulate fitting function which encodes results use it to estimate disruption timescales mini-haloes, taking account stellar velocity dispersion distribution. For M< {\cal O}(10^{-7} M_{\odot} on typical orbits pass through disc, we estimated are mini-halo mass, order age Milky Way. more massive increase rapidly increasing mass.