The bar pattern speed of dwarf galaxy NGC 4431

E. M. Corsini*, J. A.L. Aguerri, Victor P. Debattista, A. Pizzella, F. D. Barazza, H. Jerjen

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)


    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, aB. We found D L/aB = 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 ≤ DLaB ≤ 1.4) is about twice as likely as that the bar is much shorter than the corotation radius (i.e., DL/aB > 1.4).

    Original languageEnglish
    Pages (from-to)L121-L124
    JournalAstrophysical Journal
    Issue number2 II
    Publication statusPublished - 20 Apr 2007


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