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

[21] Candidate members of the Pal 5, GD-1, Cetus Polar and Orphan tidal stellar halo streams from SDSS DR9, LAMOST DR3 and APOGEE catalogs
Li, Guang-Wei
Yanny, Brian
Zhang, Hao-Tong
Bai, Zong-Rui
Wu, Yue
Dong, Yi-Qiao
Lei, Ya-Juan
Yuan, Hai-Long
Hou, Yong-Hui
Wang, Yue-Fei
Zhang, Yong
RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2017, 17 (06)
[22] Spectroscopy of the Young Stellar Association Price-Whelan 1: Origin in the Magellanic Leading Arm and Constraints on the Milky Way Hot Halo
Nidever, David L.
Price-Whelan, Adrian M.
Choi, Yumi
Beaton, Rachael L.
Hansen, Terese T.
Boubert, Douglas
Aguado, David
Ezzeddine, Rana
Oh, Semyeong
Evans, N. Wyn
ASTROPHYSICAL JOURNAL, 2019, 887 (02):

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