Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1308m&link_type=abstract
American Astronomical Society Meeting 206, #13.08; Bulletin of the American Astronomical Society, Vol. 37, p.452
Other
1
Scientific paper
Spiral galaxies displaying molecule-dominated ISMs are potential candidates for pattern speed determination by the Tremaine-Weinberg method (1984); the molecular gas of such galaxies, as traced by CO emission, is argued to approximately obey the continuity equation on orbital timescales - a key requirement of the method. We continue our work on this application of the Tremaine-Weinberg method with pattern speed determinations of several galaxies using CO emission data cubes from the BIMA SONG survey. Because the reliability of a method such as this depends on the presence of a pattern, we select the galaxies in our sample by visual inspection and by the use of Fourier decompositions of deprojected surface brightness intensities as a means of examining whether a large-scale pattern exists. Molecular dominance is addressed using the results of Wong and Blitz (2002), wherein radial profiles indicate that some of the galaxies in our sample are molecule-dominated in the region of CO detection. We also use their finding that HI column densities are generally ≲ 10 M&sun; /pc2 as evidence for molecule-dominated ISMs in other sample galaxies.
Meidt Sharon E.
Rand Richard J.
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