Stellar velocity dispersion of the leo a dwarf galaxy

被引：29
作者：
Brown, Warren R. [1 ]
Geller, Margaret J. [1 ]
Kenyon, Scott J. [1 ]
Kurtz, Michael J. [1 ]
机构：
[1] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA
来源：
ASTROPHYSICAL JOURNAL | 2007年 / 666卷 / 01期
关键词：
galaxies : individual ( Leo A);
D O I：
10.1086/519547
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We measure the first stellar velocity dispersion of the Leo A dwarf galaxy, sigma = 9.3 +/- 1.3 km s(-1). We derive the velocity dispersion from the radial velocities of 10 young B supergiants and two H II regions in the central region of Leo A. We estimate a projected mass of (8 +/- 2.7) x 10(7) M-circle dot within a radius of 2' and a mass-to-light ratio of at least 20 +/- 6 M-circle dot/L-circle dot. These results imply Leo A is at least similar to 80% dark matter by mass.
引用
收藏
页码：231 / 235
页数：5
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