Milliarcsecond-Accurate Astrometry of 34 Southern Hemisphere Radio Sources

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dc.contributor.authorFey, Alan L.
dc.contributor.authorOjha, Roopesh
dc.contributor.authorQuick, Jonathan F. H.
dc.contributor.authorNicolson, George D.
dc.contributor.authorLovell, James E. J.
dc.contributor.authorReynolds, John E.
dc.contributor.authorEllingsen, Simon P.
dc.contributor.authorMcCulloch, Peter M.
dc.contributor.authorJohnston, Kenneth J.
dc.contributor.authorJauncey, David L.
dc.contributor.authorTzioumis, Anastasios K.
dc.date.accessioned2020-04-20T12:33:01Z
dc.date.available2020-04-20T12:33:01Z
dc.date.issued2006-11-01
dc.description.abstractMilliarcsecond-accurate radio positions in the International Celestial Reference Frame for 34 southern hemisphere extragalactic sources are reported. The positions are derived from Mark III/IV very long baseline interferometry observations made between 2004 August and 2006 April using radio telescopes located in Australia, South Africa, and Hawaii. Positions for 7 of the 34 sources have been reported previously by us but are reported here with significantly improved accuracy. These results supplement an ongoing project to increase the sky density of southern hemisphere sources in order to better define the International Celestial Reference Frame and to provide additional phase reference sources with accurate positions for use in astrophysical observations. Positions for all 34 sources are south of δ = -20° (positions for nine of the sources are south of δ = -60°) and have average formal uncertainties of 0.23 mas in α cos δ and 0.35 mas in δ.en_US
dc.description.sponsorshipWe would like to thank the staffs of the participating observatories for the time and effort required to make these observations. In addition, we would like to thank the staff of the Washington Correlator for their hard work and dedication. We would also like to thank the NASA/JPL Deep Space Network for MEGA support and for use of the 70 m antenna at Tidbinbilla, ACT, Australia. This research has made use of the NASA/ IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.en_US
dc.description.urihttps://iopscience.iop.org/article/10.1086/507991en_US
dc.format.extent6 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2jb79-f9da
dc.identifier.citationAlan L. Fey, Roopesh Ojha, Jonathan F. H. Quick, George D. Nicolson, James E. J. Lovell, John E. Reynolds, Simon P. Ellingsen, Peter M. McCulloch, Kenneth J. Johnston, David L. Jauncey, and Anastasios K. Tzioumis,Milliarcsecond-Accurate Astrometry of 34 Southern Hemisphere Radio Sources, The Astronomical Journal, Volume 132, Number 5, https://iopscience.iop.org/article/10.1086/507991en_US
dc.identifier.urihttp://hdl.handle.net/11603/18131
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2006AJ....132.1944F
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2006AJ....132.1944F
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleMilliarcsecond-Accurate Astrometry of 34 Southern Hemisphere Radio Sourcesen_US
dc.typeTexten_US

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