4.7 Article

Substructure in tidal streams: Tributaries in the anticenter stream

期刊

ASTROPHYSICAL JOURNAL
卷 651, 期 1, 页码 L29-L32

出版社

IOP PUBLISHING LTD
DOI: 10.1086/509255

关键词

galaxy : halo; galaxy : structure

向作者/读者索取更多资源

We report on the detection in Sloan Digital Sky Survey data of at least three, roughly parallel components in a 65 degrees-long, stellar stream complex previously identified with the Monoceros Ring. The three-stream complex varies in width from 4 degrees to 6 degrees along its length and appears to be made up of two or more narrow substreams as well as a broader, diffuse component. The width and complexity of the stream indicate that the progenitor was likely a dwarf galaxy of significant size and mass. The stream is 8.9 kpc distant and is oriented almost perpendicularly to our line of sight. The visible portion of the stream does not pass near any known dwarf galaxies, and a preliminary orbit does not point to any viable progenitor candidates. Orbits for the narrower substreams can be modeled with velocity offsets from the broad component of approximate to 8 km s(-1). We suggest that the broad component is likely to be the remains of a dwarf galaxy, while the narrower streams constitute the remnants of dynamically distinct components that may have included a native population of globular clusters. While the color of the main-sequence turnoff is not unlike that for the Monoceros Ring, neither the visible stream nor any reasonable projection of its orbit passes through Monoceros or Canis Major, and we conclude that this stream is probably unrelated to the overdensities found in these regions.

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。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据