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The Celestial Reference Frame at 24 and 43 GHz. II. Imaging

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.authorBOBOLTZ, D. A.
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.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorLANYI, G. E.
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.created2010
dc.date.issued2010
dc.identifier.issn0004-637X
dc.description.abstractEnWe have measured the sub-milli-arcsecond structure of 274 extragalactic sources at 24 and 43 GHz in order to assess their astrometric suitability for use in a high frequency celestial reference frame (CRF). Ten sessions of observations with the Very Long Baseline Array have been conducted over the course of $\sim$5 years, with a total of 1339 images produced for the 274 sources. There are several quantities that can be used to characterize the impact of intrinsic source structure on astrometric observations including the source flux density, the flux density variability, the source structure index, the source compactness, and the compactness variability. A detailed analysis of these imaging quantities shows that (1) our selection of compact sources from 8.4 GHz catalogs yielded sources with flux densities, averaged over the sessions in which each source was observed, of about 1 Jy at both 24 and 43 GHz, (2) on average the source flux densities at 24 GHz varied by 20%-25% relative to their mean values, with variations in the session-to-session flux density scale being less than 10%, (3) sources were found to be more compact with less intrinsic structure at higher frequencies, and (4) variations of the core radio emission relative to the total flux density of the source are less than 8% on average at 24 GHz. We conclude that the reduction in the effects due to source structure gained by observing at higher frequencies will result in an improved CRF and a pool of high-quality fiducial reference points for use in spacecraft navigation over the next decade.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.title.enThe Celestial Reference Frame at 24 and 43 GHz. II. Imaging
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-6256/139/5/1713
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
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]
dc.identifier.arxiv1003.1067
bordeaux.journalThe Astrophysical Journal
bordeaux.page1713-1770
bordeaux.volume139
bordeaux.issue5
bordeaux.peerReviewedoui
hal.identifierhal-00466219
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00466219v1
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