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A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo
Yuan,Zhen1; Chang,Jiang2,3; Beers,Timothy C.4; Huang,Yang5
2020-07-29
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume898Issue:2
AbstractAbstract 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.
KeywordMilky Way stellar halo Globular star clusters
DOI10.3847/2041-8213/aba49f
Language英语
WOS IDIOP:2041-8205-898-2-aba49f
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/63375
Collection中国科学院国家天文台
Affiliation1.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; sala.yuan@gmail.com
2.Key Lab of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012 Beijing, People’s Republic of China
3.Purple Mountain Observatory, CAS, No.8 Yuanhua Road, Qixia District, Nanjing 210034, People’s Republic of China
4.Department of Physics and JINA Center for the Evolution of the Elements (JINA-CEE), University of Notre Dame, Notre Dame, IN 46556, USA
5.South-Western Institute For Astronomy Research, Yunnan University, Kunming 650500, People’s Republic of China
Recommended Citation
GB/T 7714
Yuan,Zhen,Chang,Jiang,Beers,Timothy C.,et al. A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo[J]. The Astrophysical Journal Letters,2020,898(2).
APA Yuan,Zhen,Chang,Jiang,Beers,Timothy C.,&Huang,Yang.(2020).A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo.The Astrophysical Journal Letters,898(2).
MLA Yuan,Zhen,et al."A Low-mass Stellar-debris Stream Associated with a Globular Cluster Pair in the Halo".The Astrophysical Journal Letters 898.2(2020).
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