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Title:
On mini-halo encounters with stars
Authors:
Green, Anne M.; Goodwin, Simon P.
Affiliation:
AA(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD), AB(Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 375, Issue 3, pp. 1111-1120. (MNRAS Homepage)
Publication Date:
03/2007
Origin:
MNRAS
Astronomy Keywords:
Galaxy: structure, dark matter
DOI:
10.1111/j.1365-2966.2007.11397.x
Bibliographic Code:
2007MNRAS.375.1111G

Abstract

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

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