Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l...5t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 1, 1984, p. L5-L7.
Astronomy and Astrophysics
Astrophysics
156
Barred Galaxies, Celestial Mechanics, Galactic Rotation, Kinematics, Brightness, Galactic Structure, Perturbation Theory
Scientific paper
It is possible to measure the pattern speed Omega(p) of a barred disk galaxy without employing any particular dynamical model. The main assumption required is that the luminosity density of the tracer obey a continuity equation. In its simplest form, the method requires measuring the surface brightness and radial velocity along a strip parallel to the line of nodes. If position and velocity are measured relative to the galactic center, then the luminosity-weighted mean velocity in the strip, divided by the component of the luminosity-weighted mean position vector which is parallel to the line of nodes, is equal to Omega(p) sin i. The method has been tested on a numerical simulation of a barred disk constructed by Sellwood (1983). It is found that Omega(p) can be reliably measured to + or - 15 percent.
Tremaine Scott
Weinberg Martin D.
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