Other
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992baas...24.1267m&link_type=abstract
American Astronomical Society Meeting, 181, #92.03; Bull. American Astron. Soc., Vol. 24, p.1267
Other
1
Scientific paper
The results of a systematic study of the inclined family of prograde anomalous orbits in rotating, triaxial gravitational potentials are presented. For the case where the long axis of the potential is the rotation axis, the bifurcation sequence of orbits containing the prograde anomalous family is explored as a function of the rotation speed of the potential. Neutral hydrogen observations of the galaxies NGC 2685 and NGC 660 obtained with the Very Large Array Radio Telescope (VLA) are also presented. Maps derived from these observations show that both galaxies contain two kinematically distinct systems of gas, one in a nearly polar orientation, and the other approximately in the plane of the central stellar disk. If the underlying gravitational potential of the galaxy is triaxial and rotating about the long axis, such configurations can be stable. It is shown that models constructed from an ensemble of prograde orbits containing the stable anomalous and elliptical families yield velocity and surface density maps similar to those derived from the VLA neutral hydrogen observations of NGC 2685 and NGC 660. The real interest of such a treatment is that, unlike the case for rotation about the short axis of the potential, it allows for the stars and gas in the disk of the central galaxy to rotate in the same sense. These models indicate that for both NGC 2685 and NGC 660, the underlying gravitational potential is mildly triaxial and slowly rotating about its long axis. An understanding of the shape of the gravitational potentials for these peculiar galaxies ultimately may lead to a better understanding of the three-dimensional distribution of matter in normal elliptical and spiral galaxies.
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