Is NGC 5824 the Core of the Progenitor of the Cetus Stream?
Chang,Jiang1,2; Yuan,Zhen3; Xue,Xiang-Xiang1; Simion,Iulia T.3; Kang,Xi2,4; Li,Ting S.5,6; Zhao,Jing-Kun1; Zhao,Gang1
Source PublicationThe Astrophysical Journal
AbstractAbstract The complicated story of the Cetus Stream (CS) is recently revealed by its newly discovered ~150 members with 6D kinematics from the cross-matched catalog of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5 K giants and Gaia DR2. It exhibits a very diffuse structure at heliocentric distances between 20 and 50 kpc, extending over at least 100°, and crossing the Galactic plane. Interestingly, The CS is dynamically linked to a massive globular cluster, NGC 5824. A suggestive scenario is that NGC 5824 was the nuclear star cluster of the dwarf progenitor of the CS. We explore this scenario by modeling the disruption process of a dwarf galaxy in the Milky Way potential, on the orbit of NGC 5824, using a suite of N-body simulations. Our results show that the simulated stream can marginally recover the main component of the CS, which is the densest part of the observed stream. Inspired by this mismatch, we use a dwarf progenitor following the representative orbit of the main component members, and find it can reproduce the general morphology of the CS. This gives us a more favorable scenario of the CS progenitor, in which NGC 5824 was not the core, but located off-center. Our fiducial model also predicts a vast extension of the CS in the South, surprisingly coincident with a newly discovered wide southern stream “Palca.” Another more diffuse substructure, the Eridanus–Phoenix overdensity is also likely to be related to the CS progenitor.
Keywordthe Milky Way N-body simulations
WOS IDIOP:0004-637X-905-2-abc338
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorYuan,Zhen
Affiliation1.Key Lab of Optical Astronomy, National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012 Beijing, People's Republic of China;
2.Purple Mountain Observatory, CAS, No.8 Yuanhua Road, Qixia District, Nanjing 210034, People's Republic of China
3.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;
4.Zhejiang University-Purple Mountain Observatory Joint Research Center for Astronomy, Zhejiang University, Hangzhou 310027, People's Republic of China
5.Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
6.Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
Recommended Citation
GB/T 7714
Chang,Jiang,Yuan,Zhen,Xue,Xiang-Xiang,et al. Is NGC 5824 the Core of the Progenitor of the Cetus Stream?[J]. The Astrophysical Journal,2020,905(2).
APA Chang,Jiang.,Yuan,Zhen.,Xue,Xiang-Xiang.,Simion,Iulia T..,Kang,Xi.,...&Zhao,Gang.(2020).Is NGC 5824 the Core of the Progenitor of the Cetus Stream?.The Astrophysical Journal,905(2).
MLA Chang,Jiang,et al."Is NGC 5824 the Core of the Progenitor of the Cetus Stream?".The Astrophysical Journal 905.2(2020).
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