VLA HI Imaging of the Extreme Star-Forming Dwarf Galaxy Leo P

Type Conference Paper
Names Elijah Bernstein-Cooper, J. M. Cannon, E. A. Adams, R. Giovanelli, M. P. Haynes, K. B. McQuinn, K. L. Rhode, J. J. Salzer, E. D. Skillman
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #221, #352.07
Volume 221
Date January 1, 2013
URL http://adsabs.org/2013AAS.22135207B
Library Catalog labs.adsabs.harvard.edu
Abstract The ALFALFA survey recently discovered the galaxy Leo P, one of the most extreme low-mass star-forming dwarf galaxies in the local volume. We present new HI spectral line imaging of Leo P acquired with the Karl G. Jansky Very Large Array (VLA) in the B- and C-configurations. A peak column density of 2.5×1020 cm-2 is detected at 30 arcsecond resolution and is spatially coincident with the optical center. Diffuse, low column density HI emission extends to the Southeast. 40% of the ALFALFA flux was recovered by the C-configuration observations; a substantial fraction of the neutral gas component resides on scales larger than 30 arcseconds. A sparsely sampled rotation curve demonstrates that the neutral gas is kinematically complex on scales of ~100 pc. We estimate the dynamical mass Mdyn = 8×106 DMpc M⊙, where DMpc is the distance in Mpc. This can be compared with the total HI mass, MHI = 3×105 D2Mpc .
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