Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l..47f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. L47-L50. Research supported by Leid
Astronomy and Astrophysics
Astrophysics
93
Astronomical Photometry, Circular Orbits, Galactic Evolution, Red Shift, Spiral Galaxies, Astronomical Models, Gas Dynamics
Scientific paper
The observable effects of elongated disks on the kinematical properties of spirals are explored, and an upper limit on the ellipticity is derived. Observable effects are observed in the photometry and kinematics of the stars and gas in the disk, if substructure like bars and spiral arms can be ignored. These effects include ellipticity gradients and position angle twists in disks, velocity gradients along the apparent minor axis of the disk, differences between kinematically determined inclinations and photometrically determined inclinations, and systematic residuals in circular orbit fits to the velocity field. Noncircular gas motions are found to produce significant scatter in the Tully-Fisher relation, amounting to 0.46 mag if the ellipticity of the potential in the plane of the disk is 0.10. Thus, small deviations from axisymmetry are sufficient to produce all or most of the observed scatter in the Tully-Fisher relation. It is inferred that use of detailed kinematic information may reduce the observed scatter in the Tully-Fisher relation by 0.1 mag or more.
de Zeeuw Tim
Franx Marijn
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