A New Tidal Stream Discovered in Gaia DR3

被引：1
作者：
Tian, Hao [1 ,2 ]
Liu, Chao [1 ,2 ]
Luo, Changqing [1 ]
Xue, Xiang-Xiang [2 ,3 ]
Yang, Yujiao [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100101, Peoples R China
[2] Beijing Normal Univ, Inst Frontiers Astron & Astrophys, Beijing 102206, Peoples R China
[3] Chinese Acad Sci, CAS Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2024年 / 965卷 / 01期
基金：
北京市自然科学基金; 国家重点研发计划; 中国国家自然科学基金;
关键词：
STELLAR HALO; RR LYRAE; DEBRIS STREAMS; SUBSTRUCTURES; TAILS; STARS; MILKY; VIEW; MAP;
D O I：
10.3847/1538-4357/ad2c06
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Thanks to the precise astrometric measurements of proper motions by the Gaia mission, a new tidal stellar stream has been discovered in the northern hemisphere. The distribution of star count shows that the stream is approximately 80 degrees long and 1.degrees 70 wide. Observations of 21 member stars, including 14 RR Lyrae stars, indicate that the stream has an eccentric and retrograde orbit with e = 0.58. The low metallicity, high total energy, and large angular momentum suggest that it is associated with the merging event Sequoia. This discovery suggests the possibility of finding more substructures with high eccentricity orbits, even in the inner halo.
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页数：7
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