TY - JOUR
T1 - The bar pattern speed of dwarf galaxy NGC 4431
AU - Corsini, E. M.
AU - Aguerri, J. A.L.
AU - Debattista, Victor P.
AU - Pizzella, A.
AU - Barazza, F. D.
AU - Jerjen, H.
PY - 2007/4/20
Y1 - 2007/4/20
N2 - 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).
AB - 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).
KW - Galaxies: elliptical and lenticular, cD
KW - Galaxies: individual (NGC 4431)
KW - Galaxies: kinematics and dynamics
KW - Galaxies: photometry
KW - Galaxies: structure
UR - http://www.scopus.com/inward/record.url?scp=34248369835&partnerID=8YFLogxK
U2 - 10.1086/518035
DO - 10.1086/518035
M3 - Article
SN - 0004-637X
VL - 659
SP - L121-L124
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 II
ER -