On mini-halo encounters with stars
| dc.creator | Green, Anne M. | |
| dc.creator | Goodwin, Simon P. | |
| dc.date | 2006-04-06 | |
| dc.date | 2006-12-11 | |
| dc.date.accessioned | 2026-07-07T10:22:59Z | |
| dc.date.available | 2026-07-07T10:22:59Z | |
| dc.description | 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 profile 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 timescales of mini-haloes, taking into account the stellar velocity dispersion and mass distribution. For mini-haloes with mass M< {\cal O}(10^{-7} M_{\odot} on typical orbits which pass through the disc, we find that the estimated disruption timescales are independent of mini-halo mass, and are of order the age of the Milky Way. For more massive mini-haloes the estimated disruption timescales increase rapidly with increasing mass. | |
| dc.description | 10 pages, 6 figures. Version to appear in MNRAS. Significant changes to presentation, but conclusions essentially unchanged | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0604142 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0604142 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.375:1111-1120,2007 | |
| dc.identifier | doi:10.1111/j.1365-2966.2007.11397.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/175666 | |
| dc.subject | Astrophysics | |
| dc.title | On mini-halo encounters with stars | |
| dc.type | text |