Dark Halo Orbits and Tidal Stripping with the Spirographic Approximation
نویسنده
چکیده
This paper discusses the orbit of a small dark matter halo, mass = .1M inside of a larger halo, mass = M. Using the spirographic approximation for the orbits, it addresses the effect of three orbital parameters: energy, angular momentum, and a frictional coefficient. Next, it analyzes the way mass is stripped from the small halo through tidal forces and the effect of the ratio of the density scales of the halos. Finally, it examines the resulting change in the large halo’s density profile.
منابع مشابه
Dark Halo Orbits, Tidal Stripping, and the Spirographic Approximation
This paper examines the problem of a small dark matter halo orbiting in a larger dark matter halo with a Hernquist potential. Undamped orbits can be obtained from numerically integrating the equation for force in a Hernquist potential. They can also be modelled analytically using a spirographic approximation (Adams and Bloch 2005). Damped orbits can be obtained by adding a damping term to the f...
متن کاملGlobular Clusters with Dark Matter Halos. Ii. Evolution in Tidal Field
In this second paper in our series, we continue to test primordial scenarios of globular cluster formation which predict that globular clusters formed in the early universe in the potential of dark matter minihalos. In this paper we use high-resolution N-body simulations to model tidal stripping experienced by primordial darkmatter dominated globular clusters in the static gravitational potenti...
متن کاملDisruption of satellites in cosmological haloes
We investigate how the survival of dark matter satellites inside virialized halos depends on tidal stripping and dynamical friction. We use an analytic approach and then compare the results with N-Body simulations. Both the satellites and the primary halos are similar to cosmological haloes and have NFW density profiles. Satellites can either merge with the primary halo or continue to move on b...
متن کاملMini-halo disruption due to encounters with stars
We study the energy loss and disruption of dark matter mini-halos due to interactions with stars. We find that the fractional energy loss in simulations agrees well with the analytic impulse approximation for small and large impact parameters, with a rapid transition between these two regimes. The fractional energy loss at large impact parameters is fairly independent of the mass and density pr...
متن کاملThe impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies
We use N-body simulations to study the effects that a divergent (i.e. ‘cuspy’) dark matter profile introduces on the tidal evolution of dwarf spheroidal galaxies (dSphs). Our models assume cosmologically motivated initial conditions where dSphs are dark-matter-dominated systems on eccentric orbits about a host galaxy composed of a dark halo and a baryonic disc. We find that the resilience of dS...
متن کامل