Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832907s&link_type=abstract
American Astronomical Society, AAS Meeting #218, #329.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the pattern speed as a function of radius for the grand-design spiral galaxy NGC 3031, and the dwarf irregular galaxies NGC 2366 and DDO 154. The pattern speeds were found using a method of solving the Tremaine-Weinberg equations that allows for radial variation. Three different data sets of NGC 3031 were used for determining the pattern speed and its radial behavior. The results for NGC 3031 show convincing evidence for a shearing pattern, which is inconsistent with the assumption of a rigid pattern in some theories of spiral structure. The method was applied to NGC 2366 and DDO 154 to see what sorts of results are obtained for patterns that are not very coherent or well organized. Understanding how the solution method is affected by the different qualities of a data set will be useful for selecting a sample of galaxies for applying the method.
Speights Jason
Westpfahl David
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