Other
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..257t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 15, 1985, p. 257-273. Research supported by t
Other
67
Barred Galaxies, Galactic Rotation, Galactic Structure, Orbit Calculation, Astronomical Models, Gas Dynamics, Numerical Integration, Spiral Galaxies
Scientific paper
Numerical integrations of 2D-orbits demonstrate that the principal family of periodic orbits in strong barred potentials is the prograde parallel family. All other families have orbit density distributions which are inconsistent with the imposed potential. Some important implications are discussed: (1) bars tumble in the sense of galactic rotation; (2) corotation must lie outside the bar distortion; (3) strong rapidly tumbling bars are cold, and, conversely, strong slowly tumbling bars are hot and (4) the magnitude of the bar distortion is limited to axial ratios of about 1:5, due to the onset of stochasticity well inside corotation. A small population of stars on stochastic orbits may form the more nearly axisymmetric lens structure seen in some barred galaxies.
Sanders Robert H.
Teuben Peter J.
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