A New Tidal Stream Discovered in Gaia DR3

Abstract 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° long and 1.°70 wide. Observations of 21 member stars, in...

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Bibliographic Details
Published in:The Astrophysical journal 2024-04, Vol.965 (1), p.10
Main Authors: Tian, Hao, Liu, Chao, Luo, Changqing, Xue, Xiang-Xiang, Yang, Yujiao
Format: Article
Language:English
Subjects:
Angular momentum
Galaxy structure
Metallicity
Milky Way stellar halo
Momentum
Northern Hemisphere
Retrograde orbits
Rivers
Stars
Stellar streams
Variable stars
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Summary:Abstract 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° long and 1.°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.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad2c06