The bar pattern speed of NGC 4431
Astrophysics
2015-06-24 v1
Abstract
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 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 bar ends close to its corotation radius (i.e., 1.0 \leq D_L/a_B \leq 1.4) is about twice as likely as that the bar is much shorter than corotation radius (i.e., D_L/a_B > 1.4).
Keywords
Cite
@article{arxiv.astro-ph/0703332,
title = {The bar pattern speed of NGC 4431},
author = {E. M. Corsini and J. A. L. Aguerri and Victor P. Debattista and A. Pizzella and F. D. Barazza and H. Jerjen},
journal= {arXiv preprint arXiv:astro-ph/0703332},
year = {2015}
}
Comments
13 pages, 3 figures, accepted for publication in ApJL