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1999ApJS..125...99B - Astrophys. J., Suppl. Ser., 125, 99-121 (1999/November-0)
Precision velocity fields in spiral galaxies. I. Noncircular motions and rms noise in disks.
BEAUVAIS C. and BOTHUN G.
Abstract (from CDS):
The kinematic disk models are used to find the residual velocity fields, and typical residuals are found to be 10-15 km.s–1 over regions 0.5-1.5 kpc in diameter. Correlations are shown to exist between the residual velocity fields and both the Hα intensity and the velocity dispersion images. This suggests that kinematic feedback to the gas from star formation is an important source of noncircular motion. However, the relative quiescence of the large-scale velocity field indicates that the effect does not cause a significant deviation from circular symmetry, kinematically indicating that star formation is not a hidden parameter in the Tully-Fisher relation. Finally, the residual velocity fields are examined for signs of noncircular orbits by looking for azimuthal angular harmonics that would be present if disk galaxies are embedded in a triaxial dark matter potential. For our sample we find the ellipticity of the gas orbits to be ≲0.08, which implies the potential is relatively round. This is consistent with disks being maximal.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Kinematics and Dynamics - Techniques: Interferometric
Errata: Erratum vol. 128, p. 405 (2000)
Simbad objects: 12
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