A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo

A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo
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与晕中一对球状星团相关的低质量恒星碎片流

DOI:
10.3847/2041-8213/aba49f
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发表时间:
2020-07
影响因子:
7.9
通讯作者:
Huang Yang
Huang Yang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yuan Zhen;Chang Jiang;Beers Timothy C.;Huang Yang

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有预期的球状星团(GC)和恒星的子结构之间的物理关系,在银河系中,不是所有的都还没有被发现。我们寻找这样的子结构从一个组合的晕样本的SDSS蓝色水平分支和SDSS+LAMOST RR天琴座恒星,交叉匹配的天体测量信息从盖亚DR 2。这是一个古老恒星的样本,也是结构的优秀示踪剂,是寻找外部恒星晕中古代遗迹的理想选择。通过将基于神经网络的方法StarGO应用于我们样本的全4D动力学空间,我们重新发现了人马座流,并发现了盖亚-土卫二-香肠和红杉事件的碎片,以及它们与几个GC的联系。最重要的是,我们发现了一个新的,低质量的,碎片流与一对GC(NGC 5024和NGC 5053),我们称之为LMS-1。这条流有一个非常极地的轨道,占据了距离银河系中心10到20千秒差距的区域。NGC 5024(M53),关联的GC对中质量更大的一个,根据N体模拟的结果,很可能是一个现已破裂的矮星系祖先的核星星团。
There are expected to be physical relationships between the globular clusters (GCs) and stellar substructures in the Milky Way, not all of which have yet been found. We search for such substructures from a combined halo sample of SDSS blue horizontal-branch and SDSS+LAMOST RR Lyrae stars, cross-matched with astrometric information from Gaia DR2. This is a sample of old stars which are also excellent tracers of structures, ideal for searching for ancient relics in the outer stellar halo. By applying the neural-network-based method StarGO to the full 4D dynamical space of our sample, we rediscover the Sagittarius Stream, and find the debris of the Gaia-Enceladus-Sausage and the Sequoia events in the outer halo, as well as their linkages with several GCs. Most importantly, we find a new, low-mass, debris stream associated with a pair of GCs (NGC 5024 and NGC 5053), which we dub LMS-1. This stream has a very polar orbit, and occupies a region between 10 to 20 kpc from the Galactic center. NGC 5024 (M53), the more massive of the associated GC pair, is very likely the nuclear star cluster of a now-disrupted dwarf galaxy progenitor, based on the results from N-body simulations.
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