Statistics – Computation
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..466p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 1, 1992, p. 466-476.
Statistics
Computation
38
Computational Astrophysics, Friction, Galactic Structure, Globular Clusters, Orbital Velocity, Stellar Motions, Astronomical Models, Elliptical Galaxies, Galactic Nuclei, Schwarzschild Metric, Spherical Harmonics
Scientific paper
The effect of dynamical friction in the deceleration of globular clusters on box orbits in triaxial potentials is investigated by means of numerical computations in Schwarzschild's (1979) self-consistent model. It is shown that, because of lack of conservation of angular momentum, GCs pass inside the galactic core where they are powerfully decelerated. Typical energy decay times are 10 times shorter than for roundish loop orbits of comparable energy. An analytic approximation for the energy decay time is derived, and it is shown that it is independent of the detailed shape of the orbit, and of the detailed velocity structure of the underlying galactic model. This mechanism preferentially acts to destroy heavy GCs, on radial-pointing orbits, in the central regions of galaxies. It is suggested that it may thus be responsible, possibly in conjunction with tidal shocks, for the large core radii and peculiar velocity ellipsoids of GCs observed in several galaxies.
Capuzzo-Dolcetta Roberto
Pesce Enrico
Vietri Mario
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