MG13 - Talk detail |
Participant |
Arca sedda, manuel | |||||||
Institution |
University of Rome "Sapienza" - Piazzale Aldo Moro, 5 - rome - Italy - Italy | |||||||
Session |
EG4 |
Accepted |
Yes |
Order |
4 |
Time |
14:50 - 15:05 | |
Talk |
Oral abstract |
Title |
Dynamical friction in cuspy galaxies | |||||
Co-authors | Roberto Capuzzo Dolcetta | |||||||
Abstract |
The classic Chandrasekhar treatment of dynamical friction fails when dealing with the motion of objects in the inner region of a galaxy which shows a cuspidal distribution of stars around its center. Here we present results concerning the orbital decay of massive objects moving in a cuspy galaxy as obtained by self-consistent direct N-body simulations as well as by a new semi-analytical treatment of dynamical friction valid in the central region of a spherical galaxy modeled with a double divergent distribution function and in presence of a local massive black hole. A comparison of these results indicate that the proposed semi-analytical approximation is not just the only acceptable in central, cuspy, regions but it also gives quantitatively satisfying approximations to the `true' (N-body) evaluations, providing reliable |
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