AI 中文总结
研究通过改进匹配滤波器在盖亚DR3数据中发现与NGC 5024相关的长潮汐尾，利用自行、金属丰度及径向速度区分其与NGC 5053和LMS - 1的流，为NGC 5024周围存在广泛潮汐尾提供首个有力证据。
AI 中文摘要
我们报告了与球状星团NGC 5024相关的长潮汐尾的发现。应用于盖亚DR3数据的改进匹配滤波器揭示了一条跨越赤经约230° - 175°的宽阔恒星流。该恒星流在天空中与LMS - 1以及球状星团NGC 5053的模拟流重叠，且三者具有相似的自行和金属丰度。我们的候选成员可能是来自NGC 5024、NGC 5053和LMS - 1的恒星混合体。然而，拖尾部分延伸到已知的LMS - 1流之外约20°。此外，利用径向速度作为赤经的函数来区分NGC 5024的真正流候选者与NGC 5053和LMS - 1的流。在与暗能量光谱仪（DESI）DR1共有的源中，我们在径向速度 - 赤经平面上发现了两个不同的序列，分别对应于NGC 5024和NGC 5053（或LMS - 1）的恒星流。这构成了NGC 5024周围存在广泛潮汐尾的首个有力证据。
英文摘要
We report the discovery of long tidal tails associated with the globular cluster (GC) NGC 5024. A modified matched filter applied to Gaia DR3 data reveals a broad stellar stream spanning $α\approx 230^{\circ}-175^{\circ}$. The stellar stream overlaps on the sky with the LMS-1 and with the simulated stream of the GC NGC 5053, and all three share similar proper motions and metallicity. Our member candidates may therefore be a mixture of stars from NGC 5024, NGC 5053, and LMS-1. Nevertheless, the trailing tail extends roughly $20^{\circ}$ beyond the known LMS-1 stream. Furthermore, the radial velocity (RV) as a function of $α$ is used to distinguish the genuine stream candidates of NGC 5024 from the streams of NGC 5053 and LMS-1. Among the sources in common with DESI (Dark Energy Spectroscopic Instrument) DR1, we found two distinct sequences in RV-$α$ plane, corresponding to the stellar streams of NGC 5024 and NGC 5053 (or LMS-1), respectively. This constitutes the first strong evidence for the existence of extensive tidal tails around NGC 5024.
Comments11 pages, 5 figures, 2 tables, accepted for publication in ApJL
