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**Session 100 - Accretion Disks and Black Holes.**

*Display session, Thursday, January 16*

*Metropolitan Ballroom, *

## [100.05] Resonant Tidal Disruption in Galactic Nuclei

*K. P. Rauch, B. Ingalls (CITA)*
It has recently been shown (Rauch amp; Tremaine 1996) that
for star clusters whose mean potential possesses certain
symmetries, the rate of angular momentum relaxation can
be greatly increased over that produced by the usual
two-body process, an effect they termed resonant
relaxation due to its dependence on orbits in the mean
potential containing particular resonant features. One
especially important system in which resonant
relaxation will occur is that of a nuclear star cluster
containing a massive black hole---which might be the
typical case, according to current evidence---in which
case the mean potential (near the black hole) is nearly
Keplerian. This paper investigates the importance of
resonant tidal disruption in such nuclei by using
numerical simulations to estimate the increase in the
total disruption rate and the associated change in the
equilibrium distribution function of such clusters
compared to their non-resonant counterparts. An estimate
of the limiting black hole mass above which resonant
tidal disruption is cut off by relativistic precession
is made. Chaotic behavior discovered in the
Wisdom-Holman symplectic mappings used to integrate the
simulated clusters is also briefly reported on.

**Program
listing for Thursday**