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
中科院分区:
文献类型:
--
作者:
Yuan Zhen;Chang Jiang;Beers Timothy C.;Huang Yang
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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DOI:
10.1088/2041-8205/717/1/l11
发表时间:
2010-05
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
D. Mackey;A. Huxor;A. Ferguson;M. Irwin;N. Tanvir;A. McConnachie;R. Ibata;S. Chapman;G. Lewis-G.
通讯作者:
D. Mackey;A. Huxor;A. Ferguson;M. Irwin;N. Tanvir;A. McConnachie;R. Ibata;S. Chapman;G. Lewis-G.
DOI:
10.1111/j.1365-2966.2010.16802.x
发表时间:
2010-04
影响因子:
4.8
作者:
I. Georgiev;T. Puzia;P. Goudfrooij;M. Hilker
通讯作者:
I. Georgiev;T. Puzia;P. Goudfrooij;M. Hilker
影响因子:
4.8
作者:
I. Simion;V. Belokurov;M. Irwin;Sergey E. Koposov
通讯作者:
I. Simion;V. Belokurov;M. Irwin;Sergey E. Koposov
影响因子:
4.8
作者:
G. Myeong;N. Evans;Belokurov;J. Sanders;Sergey E. Koposov
通讯作者:
G. Myeong;N. Evans;Belokurov;J. Sanders;Sergey E. Koposov
DOI:
10.3847/1538-4357/aad235
发表时间:
2018-05
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Haywood;P. Di Matteo;M. Lehnert;O. Snaith;S. Khoperskov;A. Gomez
通讯作者:
M. Haywood;P. Di Matteo;M. Lehnert;O. Snaith;S. Khoperskov;A. Gomez