The Pattern Speeds of M51, M83 and NGC 6946 Using CO and the Tremaine-Weinberg Method

Details The Pattern Speeds of M51, M83 and NGC 6946 Using CO and the Tremaine-Weinberg Method The Pattern Speeds of M51, M83 and NGC 6946 Using CO and the Tremaine-Weinberg Method

2004-04-19

arxiv.org/abs/astro-ph/0404365v1

Astrophys.J. 607 (2004) 285-293

Astronomy and Astrophysics

Astrophysics

33 pages, figures already in pdf. To appear in 2004 ApJ 607 285

Scientific paper

10.1086/383459

In spiral galaxies where the molecular phase dominates the ISM, the molecular gas as traced by CO emission will approximately obey the continuity equation on orbital timescales. The Tremaine-Weinberg method can then be used to determine the pattern speed of such galaxies. We have applied the method to single-dish CO maps of three nearby spirals, M51, M83 and NGC 6946 to obtain estimates of their pattern speeds: 38 +/- 7 km/s/kpc, 45 +/- 8 km/s/kpc and 39 +/- 8 km/s/kpc, respectively, and we compare these results to previous measurements. We also analyze the major sources of systematic errors in applying the Tremaine-Weinberg method to maps of CO emission.

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