The bar pattern speed of NGC 4431

Details The bar pattern speed of NGC 4431 The bar pattern speed of NGC 4431

2007-03-13

arxiv.org/abs/astro-ph/0703332v1

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted for publication in ApJL

Scientific paper

We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method, and derived the ratio of the corotation radius, D_L, to the bar semi-major axis, a_B. We found D_L/a_B=0.6^{+1.2}_{-0.4} at 99% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 \leq D_L/a_B \leq 1.4) is about twice as likely as that the bar is much shorter than corotation radius (i.e., D_L/a_B > 1.4).

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