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Fixing the reference frame for PPMXL proper motions using extragalactic sources

Research in Astronomy and Astrophysics 2015年第6期15卷 849-859页

作者： kathleen grabowski Jeffrey L. Carlin Heidi Jo Newberg Timothy C. Beers Li Chen Li-Cai Deng Carl J. Grillmair Puragra Guhathakurta Jin-Liang Hou Yong-Hui Hou Se'bastien Le'pine Chao Liu Xiao-Wei Liu A-Li Luo Martin C. Smith Brian Yanny Hao-Tong Zhang Yong Zhang Zheng Zheng Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute 110 8th Street Troy NY 12180 USA Department of Physics and JINA: Joint Institute for Nuclear Astrophysics University of Notre Dame 225 Nieuwland Science Hall Notre Dame IN 46556 USA Shanghai Astronomical Observatory Key Lab of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Spitzer Science Center 1200 E. California Blvd. Pasadena CA 91125 USA UCO/Lick Observatory Department of Astronomy and Astrophysics University of CaliforniaSanta Cruz CA 95064 USA Nanjing Institute of Astronomical Optics & Technology National Astronomical ObservatoriesChinese Academy of Sciences Department of Physics and Astronomy Georgia State University 25 Park Place Suite 605Atlanta GA 30303 USA Kavli Institute for Astronomy and Astrophysics Peking University Department of Astronomy Peking University Fermi National Accelerator Laboratory P.O. Box 500 Batavia IL 60510 USA Department of Physics and Astronomy University of Utah

We quantify and correct systematic errors in PPMXL proper motions using extragalactic sources from the first two LAMOST data releases and the Vbron-Cetty ＆ Vebron Catalog of Quasars. Although the majority of the sources are from the Veron catalog, LAMOST makes important contributions in regions that are not well-sampled by previous catalogs, particularly at low Galactic latitudes and in the south Galactic cap. We show that quasars in PPMXL have measurable and significant proper motions, which reflect the systematic zero-point offsets present in the catalog. We confirm the global proper motion shifts seen by Wu et al., and additionally find smaller-scale fluctuations of the QSO-derived corrections to an absolute frame. We average the proper motions of 158 106 extragalactic objects in bins of 3° ×3° and present a table of proper motion corrections.

关键词： catalogs -- proper motions -- surveys LAMOST

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