The Bar Pattern Speed of Dwarf Galaxy NGC 4431 | Zendy

E. M. Corsini | Zendy; J. A. L. Aguerri | Zendy; Victor P. Debattista | Zendy; A. Pizzella | Zendy; F. D. Barazza | Zendy; Helmut Jerjen | Zendy

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The Bar Pattern Speed of Dwarf Galaxy NGC 4431

Author(s) -

E. M. Corsini,

J. A. L. Aguerri,

Victor P. Debattista,

A. Pizzella,

F. D. Barazza,

Helmut Jerjen

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/518035

Subject(s) - physics , virgo cluster , astrophysics , radius , galaxy , bar (unit) , dwarf galaxy , photometry (optics) , tidal force , galaxy cluster , stars , computer security , meteorology , computer science

We present surface photometry and stellar kinematics of NGC 4431, a barreddwarf galaxy in the Virgo cluster undergoing a tidal interaction with one ofits neighbors, NGC 4436. We measured its bar pattern speed using theTremaine-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 barends close to its corotation radius (i.e., 1.0 \leq D_L/a_B \leq 1.4) is abouttwice as likely as that the bar is much shorter than corotation radius (i.e.,D_L/a_B > 1.4).Comment: 13 pages, 3 figures, accepted for publication in ApJ

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