Determination of the Pattern Speeds of M51, M83 and NGC6946 Using CO and the Tremaine-Weinberg Method

Details Determination of the Pattern Speeds of M51, M83 and NGC6946 Using CO and the Tremaine-Weinberg Method Determination of the Pattern Speeds of M51, M83 and NGC6946 Using CO and the Tremaine-Weinberg Method

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.9701z&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #97.01; Bulletin of the American Astronomical Society, Vol. 34, p.957

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We explore the use of the Tremaine-Weinberg method, using single dish CO maps, to determine the spiral pattern speed of M51, M83 and NGC 6946. The method integrates the continuity equation to yield the pattern speed, Ω P, from the intensity and velocity structure of a continuous tracer. We have used molecular gas as the tracer, since in galaxies with a molecule dominated ISMs, the molecular gas should obey the continuity equation to first order. We also explore the effects of the conversion factor from CO brightness to molecular column density on the results, both with a radial gradient in the conversion factor as well as an arm-interarm contrast.

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