More Satellites of Spiral Galaxies
More Satellites of Spiral Galaxies
复制标题
DOI：
10.1086/303784
复制
发表时间：
1996-11
期刊：
影响因子：
--
通讯作者：
D. Zaritsky;Rodney M. Smith;C. Frenk;S. White
中科院分区：
文献类型：
--
作者：
D. Zaritsky;Rodney M. Smith;C. Frenk;S. White
我们提出了一组光度与银河系相似的孤立螺旋星系的卫星星系的修订和扩展目录。该样本由 115 颗卫星组成，其中 69 颗是在我们的多光纤红移调查中发现的，用于进一步探测从原始样本获得的结果（Zaritsky 等人）。根据定义，这些卫星的预计间距为 ≲500 kpc，相对于母螺旋的绝对退行速度差小于 500 km s-1，并且比其相关的主星系至少暗 2.2 星等。这项调查的一个关键特征是这些系统的严格隔离，这简化了任何动态分析。我们没有发现任何证据表明卫星系统的速度色散随着半径达到 400 kpc 的星系中心半径而减小，这表明光环远远超出了 200 kpc。此外，新样本证实了我们之前的结论（Zaritsky 等人）：(1) 卫星与其主星之间的速度差与主星的旋转速度没有很强的相关性，(2) 卫星系统与主星盘有轻微的净旋转 (34 ± 14 km s-1)，(3) ~L* 螺旋星系的晕质量超过 2 × 1012 M☉。
We present a revised and expanded catalog of satellite galaxies of a set of isolated spiral galaxies similar in luminosity to the Milky Way. This sample of 115 satellites, 69 of which were discovered in our multifiber redshift survey, is used to probe the results obtained from the original sample further (Zaritsky et al.). The satellites are, by definition, at projected separations ≲500 kpc, have absolute recessional velocity differences with respect to the parent spiral of less than 500 km s-1, and are at least 2.2 mag fainter than their associated primary galaxy. A key characteristic of this survey is the strict isolation of these systems, which simplifies any dynamical analysis. We find no evidence for a decrease in the velocity dispersion of the satellite system as a function of radius out to galactocentric radii of 400 kpc, which suggests that the halo extends well beyond 200 kpc. Furthermore, the new sample affirms our previous conclusions (Zaritsky et al.) that (1) the velocity difference between a satellite and its primary is not strongly correlated with the rotation speed of the primary, (2) the system of satellites has a slight net rotation (34 ± 14 km s-1) in the same sense as the primary's disk, and (3) that the halo mass of an ~L* spiral galaxy is in excess of 2 × 1012 M☉.