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VLBI Observations of Southern Hemisphere ICRF Sources. II. Astrometric Suitability Based on Intrinsic Structure

hal.structure.identifierU.S. Naval Observatory
dc.contributor.authorOJHA, Roopesh
hal.structure.identifierU.S. Naval Observatory
dc.contributor.authorFEY, Alan L.
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]
dc.contributor.authorCHARLOT, P.
dc.contributor.authorJAUNCEY, David L.
dc.contributor.authorJOHNSTON, Kenneth J.
dc.contributor.authorREYNOLDS, John E.
dc.contributor.authorTZIOUMIS, Anastasios K.
dc.contributor.authorQUICK, Jonathan F. H.
dc.contributor.authorNICOLSON, George D.
hal.structure.identifierSchool of Mathematics and Physics
dc.contributor.authorELLINGSEN, Simon P.
dc.contributor.authorMCCULLOCH, Peter M.
hal.structure.identifierKashima Space Technology Center
dc.contributor.authorKOYAMA, Yasuhiro
dc.date.issued2005
dc.identifier.issn0004-6256
dc.description.abstractEnWe present 8.4 GHz very long baseline interferometry (VLBI) observations of 48 southern hemisphere extragalactic sources from the International Celestial Reference Frame. These are the second in a series of observations intended to image all such sources in the southern hemisphere at milliarcsecond resolution and bring the total number of observed sources to 111. We use these data, together with previously published data, to quantify the magnitude of the expected effect of intrinsic source structure on astrometric bandwidth synthesis VLBI observations by calculating a ``structure index'' for the sources; the structure index yields an estimate of their astrometric quality. Approximately 35% of sources in our sample have a structure index indicative of compact or very compact structures. The remaining two-thirds of our sources are less compact and should probably be avoided in astrometric and geodetic VLBI experiments requiring the highest accuracy unless intrinsic source structure can be accounted for in the astrometric/geodetic analysis.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enAstrometry
dc.subject.enGalaxies: Active
dc.subject.enGalaxies: Quasars: General
dc.subject.enRadio Continuum: Galaxies
dc.subject.enReference Systems
dc.subject.enSurveys
dc.title.enVLBI Observations of Southern Hemisphere ICRF Sources. II. Astrometric Suitability Based on Intrinsic Structure
dc.typeArticle de revue
dc.identifier.doi10.1086/497592
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalThe Astronomical Journal
bordeaux.page2529-2540
bordeaux.volume130
bordeaux.peerReviewedoui
hal.identifierhal-00406625
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00406625v1
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