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

页码：231 / 235

页数：5

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