submittedto Astrophysical Journal Letters
submittedto Astrophysical Journal Letters
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DOI：
10.1086/507324
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发表时间：
2006-04
期刊：
影响因子：
--
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中科院分区：
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我们宣布在牧夫座发现了一颗新的银河系卫星，距离约60千秒差距。它是在使用斯隆数字巡天数据第5版对北银河冠恒星过密度进行系统搜索时发现的。颜色星等图显示了一个清晰的岔道、红巨星分支和延伸的水平分支。它的绝对星等为MV ~ -5.8等，是已知最暗的星系之一。半光半径约为220 pc。等密度线被拉长，形状不规则，表明Boo可能是一个破裂的矮球状星系。
We announce the discovery of a new satellite of the Milky Way in the constellation of Bootes at a distance of ~60 kpc. It was found in a systematic search for stellar overdensities in the north Galactic cap using Sloan Digital Sky Survey Data Release 5. The color-magnitude diagram shows a well-defined turnoff, red giant branch, and extended horizontal branch. Its absolute magnitude is MV ~ -5.8 mag, which makes it one of the faintest galaxies known. The half-light radius is ~220 pc. The isodensity contours are elongated and have an irregular shape, suggesting that Boo may be a disrupted dwarf spheroidal galaxy.