Fixing the reference frame for PPMXL proper motions using extragalactic sources
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.
Additional Information
© 2015 IOP. Received 2014 August 2; accepted 2014 September 2. This research is supported by the National Science Foundation under Grant AST 09-37523. T.C.B. acknowledges partial support for this work from grant PHY 08-22648; Physics Frontier Center/Joint Institute for Nuclear Astrophysics (JINA), awarded by the US National Science Foundation. The Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences.Attached Files
Submitted - 1409.2890v1.pdf
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Additional details
- Eprint ID
- 58451
- DOI
- 10.1088/1674-4527/15/6/007
- Resolver ID
- CaltechAUTHORS:20150623-121225044
- AST 09-37523
- NSF
- PHY 08-22648
- NSF
- National Development and Reform Commission
- Created
-
2015-06-23Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)