Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1062k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1062-1069.
Astronomy and Astrophysics
Astronomy
55
Barred Galaxies, Celestial Mechanics, Galactic Rotation, Angular Velocity, Astronomical Photometry, Astronomical Spectroscopy, Radial Velocity, Velocity Distribution
Scientific paper
The pattern speed Ωp of the bar in NGC 936 is derived for the first time using a method outlined by Tremaine and Weinberg that depends only on the kinematics of the bar. Luminosity and radial-velocity profiles have been measured for four slices parallel to but offset from the apparent major axis of the disk. These are used to derive an apparent pattern speed Ωp sin i = 5.5±1.9 km s-1arcsec-1, which corresponds to Ωp = 104 km s-1kpc-1 in the plane of the disk (D = 16.6 Mpc, i = 41°). Using the rotation curve measured by Kormendy, the corotation radius lies between 28arcsec and 63arcsec. For comparison, the bar length is 52arcsec. The systematic errors affecting Ωp are discussed in detail.
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