Prograde anomalous orbits in triaxial gravitational potentials that rotate about the long axis: VLA neutral hydrogen observations and modeling of the inclined rings around the galaxies NGC 2685 and NGC 660

Details Prograde anomalous orbits in triaxial gravitational potentials that rotate about the long axis: VLA neutral hydrogen observations and modeling of the inclined rings around the galaxies NGC 2685 and NGC 660 Prograde anomalous orbits in triaxial gravitational potentials that rotate about the long axis: VLA neutral hydrogen observations and modeling of the inclined rings around the galaxies NGC 2685 and NGC 660

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........84m&link_type=abstract

Ph.D. Thesis Florida Univ., Gainesville.

Other

8

Elliptical Galaxies, Galactic Rotation, Galactic Structure, Gravitational Fields, Peculiar Galaxies, Stellar Systems, Disk Galaxies, Hydrogen, Mass Distribution, Neutral Gases, Orbits, Spiral Galaxies, Velocity Distribution, Very Large Array (Vla)

Scientific paper

This dissertation presents the results of a systematic study of the inclined family of prograde anomalous orbits in rotating, triaxial gravitational potentials. In particular, 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, such configurations can be stable. It is shown that a model constructed from an ensemble of orbits, which contains the stable anomalous and prograde elliptical families, yields 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. An understanding of the shape of gravitational potential 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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