Journal
ASTROPHYSICAL JOURNAL
Volume 659, Issue 2, Pages L121-L124Publisher
IOP PUBLISHING LTD
DOI: 10.1086/518035
Keywords
galaxies : elliptical and lenticular, cD; galaxies : individual (NGC 4431); galaxies : kinematics and dynamics; galaxies : photometry; galaxies : structure
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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) = 0.06(-0.4)(+1.2) at 99% confidence level. Albeit with large uncertainity, the probability that the bar ends close to its corotation radius (i.e., 1.0 <= D-L/a(B) <= 1.4) is about twice as likely as that the bar is much shorter than the corotation radius ( i.e., D-L/a(B) > 1.4)
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