Phase-space Correlation in Stellar Streams of the Milky Way Halo: The Clash of Kshir and GD-1

被引：22

作者：

Malhan, Khyati ^{[1
]}

Ibata, Rodrigo A. ^{[2
]}

Carlberg, Raymond G. ^{[3
]}

Bellazzini, Michele ^{[4
]}

Famaey, Benoit ^{[2
]}

Martin, Nicolas F. ^{[2
]}

机构：

[1] Stockholm Univ, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, AlbaNova, SE-10691 Stockholm, Sweden

[2] Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, F-67000 Strasbourg, France

[3] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[4] INAF Osservatorio Astrofis & Sci Spazio, Via Gobetti 93-3, I-40129 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 886卷 / 01期

基金：

美国安德鲁·梅隆基金会; 美国国家科学基金会; 瑞典研究理事会;

关键词：

GLOBULAR-CLUSTERS; DARK-MATTER; SAGITTARIUS; ORIGIN; FIELD; MAP;

D O I：

10.3847/2041-8213/ab530e

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a <CDATA<i long stellar stream in the Milky Way halo, which criss-crosses the well known ?GD-1? stream. We show that this new stellar structure (?Kshir?) and GD-1 lie at similar distance, and are remarkably correlated in kinematics. We propose several explanations for the nature of this new structure and its possible association with GD-1. However, a scenario in which these two streams were accreted onto the Milky Way within the same dark matter sub-halo seems to provide a natural explanation for their phase-space entanglement, and other complexities of this coupled system.

引用

页数：7

共 22 条

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Malhan, Khyati
Ibata, Rodrigo A.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 486 (03) : 2995 - 3005
[2] THE SHAPE OF THE INNER MILKY WAY HALO FROM OBSERVATIONS OF THE PAL 5 AND GD-1 STELLAR STREAMS
Bovy, Jo
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ASTROPHYSICAL JOURNAL, 2016, 833 (01):
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ASTROPHYSICAL JOURNAL, 2010, 712 (01): : 260 - 273
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ASTROPHYSICAL JOURNAL, 2019, 880 (01):
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Carlberg, R. G.
ASTROPHYSICAL JOURNAL, 2016, 820 (01):
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Fornasa, Mattia
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PHYSICAL REVIEW D, 2014, 89 (06):
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Martin, Nicolas F.
Ibata, Rodrigo A.
Rich, R. Michael
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ASTROPHYSICAL JOURNAL, 2014, 787 (01):
[10] PHASE-SPACE MODEL OF A COLLISIONLESS STELLAR CYLINDER EMBEDDED IN A ROTATING HALO
Kondratyev, B. P.
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