ar X iv : a st ro - p h / 97 05 13 8 v 1 1 9 M ay 1 99 7 Periodic Orbits in Triaxial Galaxies with Weak Cusps

ar X iv : a st ro - p h / 99 05 37 6 v 1 2 8 M ay 1 99 9 A 6 . 4 - hr positive superhump period in TV

ar X iv : a st ro - p h / 97 05 17 9 v 1 2 2 M ay 1 99 7 Discovery of an Optical Jet in the BL Lac Object 3 C 371

We have detected an optical jet in the BL Lac object 3C 371 that coincides with the radio jet in this object in the central few kpc. The most notable feature is a bright optical knot 3 ′′ (4 kpc) from the nucleus that occurs at the location where the jet apparently changes its direction by ∼ 30 •. The radio, near-infrared and optical observations of this knot are consistent with a single power-...

ar X iv : a st ro - p h / 02 05 14 0 v 1 9 M ay 2 00 2 Dynamics of Dark - Matter Cusps

Formation and disruption of dark-matter cusps are reviewed. Accumulation of baryons at the center of a halo can displace the dark matter, converting singular density cusps into low-density cores. The displaced mass can be of order ∼ 10M• with M• the mass of the infalling population. If M• is identified with the masses of the black holes currently observed at the centers of bright galaxies, pred...

ar X iv : a st ro - p h / 94 05 04 9 v 1 2 4 M ay 1 99 3 COMPLETE NORMALITY CONDITIONS FOR THE DYNAMICAL SYSTEMS ON RIEMANNIAN MANIFOLDS

New additional equations for the Newtonian dynamical systems on Riemannian manifolds are found. They supplement the previously found weak normality conditions up to the complete normality conditions for Newtonian dynamical systems.

ar X iv : a st ro - p h / 99 01 38 5 v 1 2 7 Ja n 19 99 Dynamical evolution of bulge shapes By MONICA VALLURI

Figure rotation substantially increases the fraction of stochastic orbits in triaxial systems. This increase is most dramatic in systems with shallow cusps showing that it is not a direct consequence of scattering by a central density cusp or black hole. In a recent study of stationary triaxial potentials (Valluri & Merritt 1998) it was found that the most important elements that define the str...