Year: 2015
Type: article
Abstract: We quantify and correct systematic errors in PPMXL proper motions using extragalactic sources from the first two LAMOST data releases and the Vèron-Cetty & Vèron Catalog of Quasars. Although the majority of the sources are from the Vèron 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.
Institutions: Rensselaer Polytechnic Institute, University of Notre Dame, Joint Institute for Nuclear Astrophysics, Shanghai Astronomical Observatory, Chinese Academy of Sciences, National Astronomical Observatories, University of California, Santa Cruz, University of California Observatories, Nanjing Institute of Astronomical Optics & Technology, Georgia State University, Peking University, Fermi National Accelerator Laboratory, University of Utah
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1553537824