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The Catalog of Positions of Optically Bright Extragalactic Radio Sources OBRS-1It is expected that the European Space Agency mission Gaia will make it possible to determine coordinates in the optical domain of more than 500,000 quasars. In 2006, a radio astrometry project was launched with the overall goal of making comparisons between coordinate systems derived from future space-born astrometry instruments and the coordinate system constructed from analysis of global very long baseline interferometry (VLBI) more robust. Investigation of the rotation, zonal errors, and non-alignment of the radio and optical positions caused by both radio and optical structures is needed to validate both techniques. In order to support these studies, the densification of the list of compact extragalactic objects that are bright in both radio and optical ranges is desirable. A set of 105 objects from the list of 398 compact extragalactic radio sources with decl. > -10deg was observed with the Very Long Baseline Array and European VLBI Network (EVN) with the primary goal of producing images with milliarcsecond resolution. These sources are brighter than 18 mag in the V band, and they were previously detected by the EVN. In this paper, coordinates of observed sources have been derived with milliarcsecond accuracies from analysis of these VLBI observations using an absolute astrometry method. The catalog of positions for 105 target sources is presented. The accuracies of source coordinates are in the range of 0.3.7 mas, with a median of 1.1 mas.
Document ID
20120010097
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Petrov, L.
(ADNET Systems, Inc. Potomac, MD, United States)
Date Acquired
August 25, 2013
Publication Date
October 1, 2011
Publication Information
Publication: The Astronomical Journal
Publisher: American Astronomical Society
Volume: 142
Issue: 4
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.00138.2012
Funding Number(s)
CONTRACT_GRANT: NNG06EB68C
Distribution Limits
Public
Copyright
Other

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