The Dynamics of Satellite and Dark Matter Halo Interactions on Galaxy Formation and Evolution

Details The Dynamics of Satellite and Dark Matter Halo Interactions on Galaxy Formation and Evolution The Dynamics of Satellite and Dark Matter Halo Interactions on Galaxy Formation and Evolution

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112602c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #126.02; Bulletin of the American Astronomical Society, Vol. 39, p.955

Astronomy and Astrophysics

Astronomy

Scientific paper

In this talk, I present consequences of satellite and dark matter halo interaction on galaxy formation focus on the effects of resonant interaction.
First, I investigate detailed physical processes in interaction between satellites and dark matter halos using analytic perturbation theory calculations and N-body simulations. The results suggest that resonant dynamics is a responsible physical mechanism for satellite-halo interaction. Comparison of different resolution simulations demonstrates that some resonances such as a density wake requires a larger number of halo particle to be reproduce and a low resolution simulation fails to do so. I also find that a low resolution simulation results in faster satellite decaying than a high resolution simulation.
Second, I investigate detailed physical processes of satellite disruption in cold dark matter host halos using idealized N-body simulations. The simulation results show that the satellite heating by resonant interactions with its host halo is important. This resonant effect appears in two distinct types: resonant shock and resonant torque. Both of the resonant effects should be considered to estimate the satellite mass loss history.
Based on our simulation results, I suggest a new crude analytic estimation of satellite mass loss. This study suggests that the resonant interaction is a key process governs the satellite and dark matter halo interaction.

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