期刊
ASTROPHYSICAL JOURNAL
卷 632, 期 2, 页码 L87-L90出版社
IOP PUBLISHING LTD
DOI: 10.1086/497686
关键词
galaxies : dwarf; galaxies : evolution; galaxies : individual (Andromeda V, Andromeda IX); local group
We present the results of a kinematic survey of the dwarf spheroidal satellite of M31, And IX, which appears to be the lowest surface brightness and also the faintest galaxy (M-V = -8.3) found to date. Using Keck DEIMOS spectroscopic data, we have measured its velocity relative to M31, its velocity dispersion, and its metallicity. It exhibits a significant velocity dispersion sigma(v) = 6.8(-2.0)(+3.0) km s(-1), which coupled with the low luminosity implies a very high mass-to-V-band light ratio, M/L similar to 93(-50)(+120) M circle dot/L circle dot (M/L > 17 M circle dot/L circle dot at 99% confidence). Unless strong tidal forces have perturbed this system, this smallest of galaxies is a highly dark matter-dominated system.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据