Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352...15b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 352, March 20, 1990, p. 15-29. Research supported by NWO.
Astronomy and Astrophysics
Astronomy
136
Galactic Structure, Radio Sources (Astronomy), Spiral Galaxies, Astronomical Models, Error Analysis, Galactic Rotation, Kinematics
Scientific paper
An analysis conducted for 12 galaxies with extended, warped H I disks in a variety of reference frames has led to the formulation of clear empirical criteria for galactic warp behavior. In view of these criteria, it emerges that while the H I layer is typically planar within R(25), warping becomes detectable within R(26.5); this is consistent with a straight line of the nodes (LON) measured in the plane defined by the innermost regions of the galaxies. At radii larger than R(26.5), the LON measured in the plane of the inner galaxy advances in the direction of galaxy rotation for successively larger radii. The nodes will accordingly lie along leading spirals in this frame of reference.
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