Tilted-ring models of the prolate spiral galaxies NGC 5033 and 5055

Details Tilted-ring models of the prolate spiral galaxies NGC 5033 and 5055 Tilted-ring models of the prolate spiral galaxies NGC 5033 and 5055

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1307c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Oct. 1988, p. 1307-1311.

Astronomy and Astrophysics

Astronomy

9

Astronomical Models, Centimeter Waves, Dark Matter, Gravitational Fields, H I Regions, Spiral Galaxies, Galactic Nuclei, Galactic Rotation, Mass To Light Ratios

Scientific paper

Observations of the kinematics of H I in the disks of spiral galaxies have shown that isovelocity contours often exhibit a twisted pattern. The shape of a galaxy's gravitational potential well (whether due to luminous matter or dark matter) can be determined from the direction of the twist. If this twist is a manifestation of the precession of a nonsteady-state disk, the authors show that the twists of NGC 5033 and 5055 imply an overall prolate shape, with the major axis of the potential well aligned along the rotation axis of the disk. Therefore, the luminous disks of these galaxies must be embedded in dark halos that are prolate spheroids or prolatelike triaxial figures.

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