Stellar Velocity Dispersion of the Leo A Dwarf Galaxy
Astrophysics
2019-08-19 v1
Abstract
We measure the first stellar velocity dispersion of the Leo A dwarf galaxy, \sigma = 9.3 +- 1.3 km/s. We derive the velocity dispersion from the radial velocities of ten young B supergiants and two HII regions in the central region of Leo A. We estimate a projected mass of 8 +- 2.7 x10^7 solar masses within a radius of 2 arcmin, and a mass to light ratio of at least 20 +- 6 M_sun/L_sun. These results imply Leo A is at least ~80% dark matter by mass.
Keywords
Cite
@article{arxiv.0705.1093,
title = {Stellar Velocity Dispersion of the Leo A Dwarf Galaxy},
author = {Warren R. Brown and Margaret J. Geller and Scott J. Kenyon and Michael J. Kurtz},
journal= {arXiv preprint arXiv:0705.1093},
year = {2019}
}
Comments
6 pages, accepted to ApJ