Halo stream candidates in the LAMOST DR2
本文选题：Galaxy 切入点：kinematics 出处：《Research in Astronomy and Astrophysics》2015年08期
【摘要】：We have cross-matched the LAMOST DR2 with the WISE, 2MASS and PPMXL catalogs and obtained a sample of 64 819 FGK metal-poor dwarfs with [Fe/H]-0.7, distances within 2 kpc from the Sun and reliable kinematics(space velocities,angular momenta and eccentricities). With a detection strategy for halo streams provided by Klement et al, nine significant "phase-space overdensities" with stars on very similar orbits are identified from this sample. Among these overdensities, three were previously known and six are new stream candidates. The kinematics and metallicities of these stream candidates are then analyzed; they have typical halo characteristics.We have extracted the most probable members of each halo stream according to their angles with respect to the North Galactic Pole and investigate the distribution of the angular momenta to further verify their existences. Detailed study of elemental abundances for these members based on high resolution and high signal-to-noise spectra from follow-up observations in the near future is of high interest to understand the origin of these streams.
[Abstract]:We have cross-matched the LAMOST DR2 with the WISE, 2MASS and PPMXL catalogs and obtained a sample of 64 819 FGK metal-poor dwarfs with [Fe/H]-0.7, distances within 2 kpc from the Sun and reliable kinematics(space velocities,angular momenta and eccentricities). With a detection strategy for halo streams provided by Klement et al, nine significant "phase-space overdensities" with stars on very similar orbits are identified from this sample. Among these overdensities, three were previously known and six are new stream candidates. The kinematics and metallicities of these stream candidates are then analyzed; they have typical halo characteristics.We have extracted the most probable members of each halo stream according to their angles with respect to the North Galactic Pole and investigate the distribution of the angular momenta to further verify their existences. Detailed study of elemental abundances for these members based on high resolution and high signal-to-noise spectra from follow-up observations in the near future is of high interest to understand the origin of these streams.
【作者单位】： Key
【基金】：supported by the National Natural Science Foundation of China (Grant Nos. 11390371, 11233004, U1431106, 11222326 and 11150110135) the National Key Basic Research Program of China (973 program, 2014CB845701 and 2014CB845703) Support from the US National Science Foundation (AST-1358787) to Embry-Riddle Aeronautical University
【分类号】：P148;P152
【参考文献】
相关期刊论文 前3条
1 ;The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2012年09期
2 ;LAMOST spectral survey——An overview[J];Research in Astronomy and Astrophysics;2012年07期
3 Heidi Jo Newberg;Jeffrey L. Carlin;Timothy C. Beers;Norbert Christlieb;Carl J. Grillmair;Puragra Guhathakurta;Hsu-Tai Lee;S忮bastien L忮pine;J. A. Sellwood;Brian Yanny;;LAMOST Experiment for Galactic Understanding and Exploration (LEGUE)——The survey's science plan[J];Research in Astronomy and Astrophysics;2012年07期
【共引文献】
相关期刊论文 前10条
1 刘杰;潘景昌;韦鹏;刘猛;罗阿理;;基于光谱相似度的恒星大气参数自动测量方法[J];光谱学与光谱分析;2012年12期
2 刘杰;潘景昌;刘猛;韦鹏;罗阿理;;恒星光谱参数自动测量中不同模板匹配度量方法比较[J];光谱学与光谱分析;2013年02期
3 杨世海;王国民;;天文光学望远镜摩擦驱动滑移动态检测与修正[J];光学精密工程;2013年08期
4 蔡江辉;杨海峰;赵旭俊;张继福;;一种晚型天体光谱离群数据挖掘系统[J];光谱学与光谱分析;2014年05期
5 卢瑜;李乡儒;杨坦;王永俊;;恒星大气物理参数估计中的稀疏特征提取[J];光谱学与光谱分析;2014年08期
6 卢瑜;李乡儒;杨坦;;基于LAMOST光谱的恒星大气物理参数估计[J];光谱学与光谱分析;2014年11期
7 石志鑫;Georges Comte;罗阿理;屠良平;赵永恒;吴福朝;;LAMOST类星体[OIII]线附近天光背景扣除[J];光谱学与光谱分析;2014年11期
8 谭鑫;潘景昌;王杰;罗阿理;屠良平;;基于神经网络的线指数恒星大气物理参数测量方法[J];光谱学与光谱分析;2013年06期
9 陈建军;白仲瑞;李广伟;王淑清;罗阿理;赵永恒;;光纤转动引起光纤光谱效率变化与改正[J];光谱学与光谱分析;2015年04期
10 方成;;关于我国未来天文大设备的一点战略思考[J];中国科学:物理学 力学 天文学;2012年12期
相关博士学位论文 前1条
1 田超;非球面非零位环形子孔径拼接干涉检测技术与系统研究[D];浙江大学;2013年
相关硕士学位论文 前2条
1 谭鑫;基于线指数的恒星大气物理参数提取方法的研究[D];山东大学;2014年
2 龚丹青;多孔结构的力学分析及新型焦面板的结构优化设计[D];中国科学技术大学;2014年
【二级参考文献】
相关期刊论文 前10条
1 Ruben Garcia-Benito;;New background quasars in the vicinity of the Andromeda Galaxy discovered with the Guoshoujing Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2010年07期
2 ;Eight new quasars discovered by the Guoshoujing Telescope (LAMOST) in one extragalactic field[J];Research in Astronomy and Astrophysics;2010年08期
3 Norbert Christlieb;;Test observations that search for metal-poor stars with the Guoshoujing Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2010年08期
4 Philippe Prugniel;;Automatic determination of stellar atmospheric parameters and construction of stellar spectral templates of the Guoshoujing Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2011年08期
5 ;Kinematics and stellar population properties of the Andromeda galaxy by using the spectroscopic observations of the Guoshoujing Telescope[J];Research in Astronomy and Astrophysics;2011年09期
6 苏定强,崔向群;主动光学─新一代大望远镜的关键技术[J];天文学进展;1999年01期
7 郝黎凯,金革,王坚,任间,李锋,万长胜,李昔华,黄鲲;基于优先策略的动态选星算法[J];天文学报;2005年02期
8 Heidi Jo Newberg;Jeffrey L. Carlin;Norbert Christlieb;Hsu-Tai Lee;;The site conditions of the Guo Shou Jing Telescope[J];Research in Astronomy and Astrophysics;2012年07期
9 ;LAMOST spectral survey——An overview[J];Research in Astronomy and Astrophysics;2012年07期
10 ;A very bright (i=16.44) quasar in the ‘redshift desert’ discovered by the Guoshoujing Telescope (LAMOST)[J];Research in Astronomy and Astrophysics;2010年08期
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