Stellar Velocity Dispersion of the Leo A Dwarf Galaxy

Details Stellar Velocity Dispersion of the Leo A Dwarf Galaxy Stellar Velocity Dispersion of the Leo A Dwarf Galaxy

2007-05-08

arxiv.org/abs/0705.1093v1

Astrophys.J.666:231-235,2007

Astronomy and Astrophysics

Astrophysics

6 pages, accepted to ApJ

Scientific paper

10.1086/519547

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.

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