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THE STRUCTURE OF THE SAGITTARIUS STELLAR STREAM AS TRACED BY BLUE HORIZONTAL BRANCH STARS
Ruhland, Christine1; Bell, Eric F.2; Rix, Hans-Walter1; Xue, Xiang-Xiang3
2011-04-20
发表期刊ASTROPHYSICAL JOURNAL
卷号731期号:2
摘要We use a sample of blue horizontal branch (BHB) stars from the Sloan Digital Sky Survey Data Release 7 to explore the structure of the tidal tails from the Sagittarius Dwarf Galaxy. We use a method yielding BHB star candidates with up to similar to 70% purity from photometry alone. The resulting sample has a distance precision of roughly 5% and can probe distances in excess of 100 kpc. Using this sample, we identify a possible extension to the trailing arm at distances of 60-80 kpc from the Sun with an estimated significance of at least 3.8 sigma. Current models predict that a distant "returning" segment of the debris stream should exist, but place it substantially closer to the Sun where no debris is observed in our data. Exploiting the distance precision of our tracers, we estimate the mean line-of-sight thickness of the leading arm to be similar to 3 kpc, and show that the two "bifurcated" branches of the debris stream differ by only 1-2 kpc in distance. With a spectroscopic very pure BHB star subsample, we estimate the velocity dispersion in the leading arm, 37 km s(-1), which is in reasonable agreement with models of Sgr disruption. We finally present a sample of high-probability Sgr BHB stars in the leading arm of Sgr, selected to have distances and velocities consistent with Sgr membership, to allow further study.
关键词Galaxies: Dwarf Galaxies: Interactions Galaxy: Halo Galaxy: Stellar Content
DOI10.1088/0004-637X/731/2/119
收录类别SCI
语种英语
WOS记录号WOS:000289779600042
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被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7984
专题光学天文研究部
作者单位1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Univ Michigan, Dept Astron, Ann Arbor, MI 48105 USA
3.CAS, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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Ruhland, Christine,Bell, Eric F.,Rix, Hans-Walter,et al. THE STRUCTURE OF THE SAGITTARIUS STELLAR STREAM AS TRACED BY BLUE HORIZONTAL BRANCH STARS[J]. ASTROPHYSICAL JOURNAL,2011,731(2).
APA Ruhland, Christine,Bell, Eric F.,Rix, Hans-Walter,&Xue, Xiang-Xiang.(2011).THE STRUCTURE OF THE SAGITTARIUS STELLAR STREAM AS TRACED BY BLUE HORIZONTAL BRANCH STARS.ASTROPHYSICAL JOURNAL,731(2).
MLA Ruhland, Christine,et al."THE STRUCTURE OF THE SAGITTARIUS STELLAR STREAM AS TRACED BY BLUE HORIZONTAL BRANCH STARS".ASTROPHYSICAL JOURNAL 731.2(2011).
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