Signatures of minor mergers in the Milky Way disc - I. The SEGUE stellar sample

被引:57
作者
Gomez, Facundo A. [1 ,2 ]
Minchev, Ivan [3 ]
O'Shea, Brian W. [1 ,2 ,4 ]
Lee, Young Sun [1 ,5 ]
Beers, Timothy C. [1 ,6 ]
An, Deokkeun [7 ]
Bullock, James S. [8 ]
Purcell, Chris W. [8 ,9 ]
Villalobos, Alvaro [10 ]
机构
[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[2] Michigan State Univ, Inst Cyber Enabled Res, E Lansing, MI 48824 USA
[3] Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany
[4] Michigan State Univ, Lyman Briggs Coll, E Lansing, MI 48825 USA
[5] Michigan State Univ, Joint Inst Nucl Astrophys JINA, E Lansing, MI 48824 USA
[6] Natl Opt Astron Observ, Tucson, AZ 85719 USA
[7] Ewha Womans Univ, Dept Sci Educ, Seoul 120750, South Korea
[8] Univ Calif Irvine, Dept Phys & Astron, Ctr Cosmol, Irvine, CA 92697 USA
[9] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[10] INAF Osservatorio Astron Trieste, I-34143 Trieste, Italy
基金
欧洲研究理事会; 美国国家科学基金会; 新加坡国家研究基金会;
关键词
methods: analytical; methods: data analysis; methods: numerical; Galaxy: disc; Galaxy: structure; galaxies: formation; galaxies: kinematics and dynamics; DARK-MATTER SUBSTRUCTURE; UVBY-BETA PHOTOMETRY; METAL-POOR STARS; HIGH-VELOCITY; SOLAR NEIGHBORHOOD; SPIRAL STRUCTURE; HALO; KINEMATICS; ORIGIN; SAGITTARIUS;
D O I
10.1111/j.1365-2966.2012.21176.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
It is now known that minor mergers are capable of creating structure in the phase-space distribution of their host galaxys disc. In order to search for such imprints in the Milky Way, we analyse the Sloan Extension for Galactic Understanding and Exploration (SEGUE) F/G dwarf and the Schuster et al. stellar samples. We find similar features in these two completely independent stellar samples, consistent with the predictions of a Milky Way minor-merger event. We next apply the same analyses to high-resolution, idealized N-body simulations of the interaction between the Sagittarius dwarf galaxy and the Milky Way. The energy distributions of stellar particle samples in small spatial regions in the host disc reveal strong variations of structure with position. We find good matches to the observations for models with a mass of Sagittarius dark matter halo progenitor 10(11) M circle dot. Thus, we show that this kind of analysis could be used to provide unprecedentedly tight constraints on Sagittarius orbital parameters, as well as place a lower limit on its mass.
引用
收藏
页码:3727 / 3739
页数:13
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