New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars

doi:10.1088/1674-4527/16/8/125

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	New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars
	Li, Jing 1,2; Liu, Chao 3; Carlin, Jeffrey L.4; Zhong, Jing 1; Hou, Jin-Liang 1; Deng, Li-Cai 3; Newberg, Heidi Jo 4; Zhang, Yong 5; Hou, Yong-Hui 5; Wang, Yue-Fei 5
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2016-08-01
卷号	16 期号:8 页码:125-U70
关键词	Galaxy: Halo Galaxy: Structure Galaxy: Kinematics And Dynamics
ISSN号	1674-4527
DOI	10.1088/1674-4527/16/8/125
英文摘要	We report two new sets of tidal debris nearby the Sagittarius (Sgr) tidal stream in the north Galactic cap (NGC) identified from the M giant stars in LAMOST DR2. The M giant stars located in the sky area of 210 degrees < Lambda < 290 degrees, and having a distance of 10-20 kpc and [Fe/H] < -0.75 show clear bimodality in their velocity distribution. We denote the two peaks as Vel-3+83 for the one within a mean velocity of -3 km s(-1) with respect to that of the well observed Sgr leading tail at the same A and Vel+162+26 for the other one with a mean velocity of 162 km s-1 with respect to the Sgr leading tail. Although the projected Lambda-V-gsr relation of Vel-3+83 is very similar to the Sgr leading tail, the opposite trend in the A distance relation as compared to the Sgr leading tail suggests Vel-3+83 has a different 3D direction of motion with any branch of the simulated Sgr tidal stream from Law & Majewski. Therefore, we propose it is new tidal debris not related to the Sgr stream. Similarly, the other substructure Vel+162+26, which is the same one as the NGC group discovered by Chou et al., also moves toward a different direction with respect to the Sgr stream, implying that it may have a different origin than the Sgr tidal stream.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000381832700008
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32757]
专题	中国科学院上海天文台
通讯作者	Li, Jing
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 4.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA 5.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Li, Jing,Liu, Chao,Carlin, Jeffrey L.,et al. New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(8):125-U70.
APA	Li, Jing.,Liu, Chao.,Carlin, Jeffrey L..,Zhong, Jing.,Hou, Jin-Liang.,...&Wang, Yue-Fei.(2016).New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(8),125-U70.
MLA	Li, Jing,et al."New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.8(2016):125-U70.