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DOI | 10.1038/nature25508 |
Two chemically similar stellar overdensities on opposite sides of the plane of the Galactic disk | |
Bergemann, Maria1; Sesar, Branimir2; Cohen, Judith G.3; Serenelli, Aldo M.4,5; Sheffield, Allyson6; Li, Ting S.7; Casagrande, Luca8,9; Johnston, Kathryn V.10; Laporte, Chervin F. P.10; Price-Whelan, Adrian M.11; Schonrich, Ralph12; Gould, Andrew1,13,14 | |
2018-03-15 | |
发表期刊 | NATURE
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ISSN | 0028-0836 |
EISSN | 1476-4687 |
出版年 | 2018 |
卷号 | 555期号:7696页码:334-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; USA; Spain; Australia; England; South Korea |
英文摘要 | Our Galaxy is thought to have an active evolutionary history, dominated over the past ten billion years or so by star formation, the accretion of cold gas and, in particular, the merging of clumps of baryonic and dark matter(1,2). The stellar halo-the faint, roughly spherical component of the Galaxy-reveals rich 'fossil' evidence of these interactions, in the form of stellar streams, substructures and chemically distinct stellar components(3-5). The effects of interactions with dwarf galaxies on the content and morphology of the Galactic disk are still being explored. Recent studies have identified kinematically distinct stellar substructures and moving groups of stars in our Galaxy, which may have extragalactic origins(6,7). There is also mounting evidence that stellar overdensities (regions with greater-than-average stellar density) at the interface between the outer disk and the halo could have been caused by the interaction of a dwarf galaxy with the disk(8-10). Here we report a spectroscopic analysis of 14 stars from two stellar overdensities, each lying about five kiloparsecs above or below the Galactic plane-locations suggestive of an association with the stellar halo. We find that the chemical compositions of these two groups of stars are almost identical, both within and between these overdensities, and closely match the abundance patterns of stars in the Galactic disk. We conclude that these stars came from the disk, and that the overdensities that they are part of were created by tidal interactions of the disk with passing or merging dwarf galaxies(11,12). |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427477100028 |
WOS关键词 | LTE LINE FORMATION ; LATE-TYPE STARS ; HYPERFINE-STRUCTURE ; MILKY-WAY ; IONIZATION BALANCE ; ISOTOPE SHIFTS ; ABUNDANCES ; SUBSTRUCTURE ; ION ; 1D |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/202854 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Max Planck Inst Astron, Koenigstuhl 17, D-69117 Heidelberg, Germany; 2.Deutsch Borse AG, Mergenthalerallee 61, D-65760 Eschborn, Germany; 3.CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA; 4.CSIC, Inst Space Sci ICE, Carrer Can Magrans, E-08193 Barcelona, Spain; 5.IEEC, C Gran Capita 2-4, E-08034 Barcelona, Spain; 6.CUNY, Dept Nat Sci, LaGuardia Community Coll, 31-10 Thomson Ave, Long Isl City, NY 11101 USA; 7.Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA; 8.Australian Natl Univ, Res Sch Astron & Astrophys, Mt Stromlo Observ, Canberra, ACT 2611, Australia; 9.ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Crawley, WA, Australia; 10.Columbia Univ, Dept Astron, 550 West 120th St,Mail Code 5246, New York, NY 10027 USA; 11.Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA; 12.Univ Oxford, Rudolf Peierls Ctr Theoret Phys, 1 Keble Rd, Oxford OX1 3NP, England; 13.Korea Astron & Space Sci Inst, Daejon 34055, South Korea; 14.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA |
推荐引用方式 GB/T 7714 | Bergemann, Maria,Sesar, Branimir,Cohen, Judith G.,et al. Two chemically similar stellar overdensities on opposite sides of the plane of the Galactic disk[J]. NATURE,2018,555(7696):334-+. |
APA | Bergemann, Maria.,Sesar, Branimir.,Cohen, Judith G..,Serenelli, Aldo M..,Sheffield, Allyson.,...&Gould, Andrew.(2018).Two chemically similar stellar overdensities on opposite sides of the plane of the Galactic disk.NATURE,555(7696),334-+. |
MLA | Bergemann, Maria,et al."Two chemically similar stellar overdensities on opposite sides of the plane of the Galactic disk".NATURE 555.7696(2018):334-+. |
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