BIG FISH, LITTLE FISH: TWO NEW ULTRA-FAINT SATELLITES OF THE MILKY WAY
BIG FISH, LITTLE FISH: TWO NEW ULTRA-FAINT SATELLITES OF THE MILKY WAY
复制标题
DOI：
10.1088/2041-8205/712/1/l103
复制
发表时间：
2010-02
期刊：
影响因子：
--
通讯作者：
V. Belokurov;M. Walker;N. Evans;G. Gilmore;M. Irwin;D. Just;Sergey E. Koposov;M. Mateo;E. Olszewski;L. Watkins;L. W. IoA;Cambridge;S. Observatory;Tucson;U. Michigan
中科院分区：
文献类型：
--
作者：
V. Belokurov;M. Walker;N. Evans;G. Gilmore;M. Irwin;D. Just;Sergey E. Koposov;M. Mateo;E. Olszewski;L. Watkins;L. W. IoA;Cambridge;S. Observatory;Tucson;U. Michigan
我们报告发现了两个新的银河系卫星在邻近星座的双鱼座和飞马座确定的数据从斯隆数字巡天。双鱼座II是一个超暗的矮星系，距离约180 kpc，距离最近探测到的双鱼座I约15°。Segue 3是一个超暗的星星团，距离16 kpc。我们使用深跟踪成像获得的4米Mayall望远镜在基特峰国家天文台，以获得它们的结构参数。双鱼座II的半光半径为1.60 pc，而Segue 3则小20倍，只有3 pc。
We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of ∼180 kpc, some 15° away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of ∼60 pc, while Segue 3 is 20 times smaller at only 3 pc.