The Bar Pattern Speed of Dwarf Galaxy NGC 4431
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 semimajor axis, a B. We found D L/a B = 0.6 -0.4+1.2 at 99% confidence level. Albeit with large uncertainty, the probability that the bar ends close to its corotation radius (i.e., 1.0 ≤ D...[Show more]
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|Source:||Astrophysical Journal, The|
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