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The Celestial Reference Frame at 24 and 43 GHz. I. Astrometry

hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorLANYI, G. E.
hal.structure.identifierU.S. Naval Observatory
dc.contributor.authorBOBOLTZ, D. A.
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorCHARLOT, P.
hal.structure.identifierU.S. Naval Observatory
dc.contributor.authorFEY, A. L.
hal.structure.identifierNational Radio Astronomy Observatory [NRAO]
dc.contributor.authorFOMALONT, E. B.
dc.contributor.authorGELDZAHLER, B. J.
hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorGORDON, D.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorJACOBS, C. S.
dc.contributor.authorMA, C.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorNAUDET, C. J.
dc.contributor.authorROMNEY, J. D.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorSOVERS, O. J.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorZHANG, L. D.
dc.date.issued2010-05
dc.identifier.issn0004-6256
dc.description.abstractEnWe present astrometric results for compact extragalactic objects observed with the Very Long Baseline Array at radio frequencies of 24 and 43 GHz. Data were obtained from ten 24 hr observing sessions made over a five-year period. These observations were motivated by the need to extend the International Celestial Reference Frame (ICRF) to higher radio frequencies to enable improved deep space navigation after 2016 and to improve state-of-the-art astrometry. Source coordinates for 268 sources were estimated at 24 GHz and for 131 sources at 43 GHz. The median formal uncertainties of right ascension and declination at 24 GHz are 0.08 and 0.15 mas, respectively. Median formal uncertainties at 43 GHz are 0.20 and 0.35 mas, respectively. Weighted root-mean-square differences between the 24 and 43 GHz positions and astrometric positions based on simultaneous 2.3 and 8.4 GHz Very Long Baseline Interferometry observations, such as the ICRF, are less than about 0.3 mas in both coordinates. With observations over five years we have achieved a precision at 24 GHz approaching that of the ICRF but unaccounted systematic errors limit the overall accuracy of the catalogs.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enastrometry
dc.subject.encatalogs
dc.subject.enquasars: general
dc.subject.enradio continuum: galaxies
dc.subject.enreference systems
dc.subject.entechniques: interferometric
dc.title.enThe Celestial Reference Frame at 24 and 43 GHz. I. Astrometry
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-6256/139/5/1695
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
bordeaux.journalThe Astronomical Journal
bordeaux.page1695-1712
bordeaux.volume139
bordeaux.peerReviewedoui
hal.identifierhal-00466226
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00466226v1
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