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An algorithm for preferential selection of spectroscopic targets in LEGUE

Research in Astronomy and Astrophysics 2012年第7期12卷 755-771页

作者： Jeffrey L. Carlin Sebastien Lepine Heidi Jo Newberg Li-Cai Deng Timothy C. Beers Yu-Qin Chen norbert christlie Xiao-Ting Fu Shuang Gao Carl J. Grillmair PuragraGuhathakurta Zhan-Wen Han Jin-Liang Hou Hsu-Tai Lee Jing Li Chao Liu Xiao-Wei Liu Kai-Ke Pan J. A. Sellwood Hong-Chi Wang Fan Yang Brian Yanny Yue-Yang Zhan Zheng Zheng Zi Zhu Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute 110 8th Street Troy NY 12180 USA carlij@rpi.edu Department of Astrophysics American Museum of Natural History Central Park West at 79thStreet New York NY 10024 USA City University of New York 365 Fifth Avenue New York NY 10016 USA National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China National Optical Astronomy Observatory Tucson AZ 85719 USA Center for Astronomy University of Heidelberg Landesstemwarte Ktinigstuhl 12 D-69117Heidelberg Germany Spitzer Science Center 1200 E. California Blvd. Pasadena CA 91125 USA JCO/Lick Observatory Department of Astronomy and Astrophysics University of CaliforniaSanta Cruz CA 95064 USA Yunnan Astronomical Observatory Chinese Academy of Sciences Kunming 650011 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanglai 200030 China Institute of Astronomy and Astrophysics Academia Sinica EO. Box 23-141 Taipei 106 China Department of Astronomy & Kavli institute of Astronomy and Astrophysics Peking UniversityBeijing 100875 China Apache Point Observatory PO Box 59 Sunspot NM 88349 USA Department of Physics and Astronomy Rutgers University 136 Frelinghuysen RoadPiscataway NJ 08854-8019 USA Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Fermi National Accelerator Laboratory EO. Box 500 Batavia IL 60510 USA Department of Physics and Astronomy University of Utah Salt Lake City UT 84112 USA Department of Astronomy Nanjing University Nanjing 210011 China

We describe a general target selection algorithm that is applicable to any survey in which the number of available candidates is much larger than the number of objects to be observed. This routine aims to achieve a balance between a smoothly- varying, well-understood selection function and the desire to preferentially select cer- tain types of targets. Some target-selection examples are shown that illustrate differentpossibilities of emphasis functions. Although it is generally applicable, the algorithm was developed specifically for the LAMOST Experiment for Galactic Understanding and Exploration （LEGUE） survey that will be carried out using the Chinese Guo Shou Jing Telescope. In particular, this algorithm was designed for the portion of LEGUE targeting the Galactic halo, in which we attempt to balance a variety of science goals that require stars at fainter magnitudes than can be completely sampled by LAMOST. This algorithm has been implemented for the halo portion of the LAMOST pilot sur- vey, which began in October 2011.

关键词： surveys: LAMOST -- Galaxy: halo -- techniques: spectroscopic

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