Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543201s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #432.01; Bulletin of the American Astronomical Society, Vol. 42, p.366
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a new method for solving the Tremaine-Weinberg equations for a pattern speed that is allowed to vary as a function of radius. The method transforms an integral equation for the pattern speed to a least squares problem with well established solution techniques and procedures for statistical analysis. It is exceptional for its ability to test whether the pattern speed is constant or if the spiral arms are winding - the former being a crucial assumption in density-wave theory. Tests of the method on patternless galaxies have produced a result of zero for the pattern speed. The method has been applied to the HI spiral arms of the barred grand-design spiral galaxy NGC 1365. Results for NGC 1365 show that the HI spiral arms more closely resemble material arms than a density wave with a constant pattern speed.
Speights Jason
Westpfahl David
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