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arXiv 1503.02079astro-ph.GAastro-ph.CO
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南方野生动物:在麦哲伦云附近发现九颗超微弱卫星

Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds

Sergey E. Koposov, Vasily Belokurov, Gabriel Torrealba, N. Wyn Evans

摘要:

我们已经使用公开发布的暗能量调查数据来寻找南半球银河系的新卫星。我们的搜索产生了大量有希望的候选人。在本文中,我们宣布发现了9个新的明确的超微弱天体,其真实性可以单独使用DES数据来确定。根据形态特征,其中三个新卫星是矮星系,其中一个位于银河系的边缘,距离380 kpc。其余6个天体的大小和光度与Segue~1卫星相当,如果没有后续的光谱观测,不能直接分类。我们已经发现的卫星聚集在LMC和SMC周围。我们表明,这种空间分布是不可能的假设下的各向同性,因此,得出结论,至少有一些新的卫星必须与麦哲伦云在过去。

英文摘要:

We have used the publicly released Dark Energy Survey data to hunt for new satellites of the Milky Way in the Southern hemisphere. Our search yielded a large number of promising candidates. In this paper, we announce the discovery of 9 new unambiguous ultra-faint objects, whose authenticity can be established with the DES data alone. Based on the morphological properties, three of the new satellites are dwarf galaxies, one of which is located at the very outskirts of the Milky Way, at a distance of 380 kpc. The remaining 6 objects have sizes and luminosities comparable to the Segue~1 satellite and can not be classified straightforwardly without follow-up spectroscopic observations. The satellites we have discovered cluster around the LMC and the SMC. We show that such spatial distribution is unlikely under the assumption of isotropy, and, therefore, conclude that at least some of the new satellites must have been associated with the Magellanic Clouds in the past.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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