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Celestial Reference Systems: Stability and Alignment

hal.structure.identifierM2A 2012
dc.contributor.authorBOURDA, G.
dc.date.issued2012
dc.date.conference2012
dc.description.abstractEnn this paper, we come back on the history of celestial reference systems, until the Gaia era, and we lay the foundations of this research area. Gaia should revolutionize this domain by creating the first extragalactic celestial reference frame directly at optical bands, on the basis of more than 10000 QSOs (Quasi Stellar Objects). In parallel, the radio frame obtained with the VLBI (Very Long Baseline Interferometry) technique has been the IAU (International Astronomical Union) fundamental celestial reference frame for several decades. The alignment between these two frames will be important in the future, not only for guaranteeing a proper transition if the fundamental reference frame is moved from the radio to the optical domain, but also for registering the radio and optical images of any celestial target with the highest accuracy. This should be of high astrophysical interest, for example to probe properly the physics of active galactic nuclei (AGN) hence placing constraints on the overall AGN geometry. We will present the studies investigated so far (in the radio but also optical domains) in order to prepare the celestial reference frame for the Gaia era.
dc.language.isoen
dc.source.titleJournées 2012 de la SF2A, Semaine de l'astrophysique française, Atelier conjoint GRAM/AS-Gaia, Nice- France, 5-8 Juin 2012.
dc.title.enCelestial Reference Systems: Stability and Alignment
dc.typeCommunication dans un congrès
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.journalUntitled
bordeaux.volume-
bordeaux.countryFR
bordeaux.title.proceedingJournées 2012 de la SF2A, Semaine de l'astrophysique française, Atelier conjoint GRAM/AS-Gaia, Nice- France, 5-8 Juin 2012.
bordeaux.conference.cityNice
bordeaux.peerReviewedoui
hal.identifierhal-00991470
hal.version1
hal.invitedoui
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00991470v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Journ%C3%A9es%202012%20de%20la%20SF2A,%20Semaine%20de%20l'astrophysique%20fran%C3%A7aise,%20Atelier%20conjoint%20GRAM/AS-Gaia,%20Nice-%20France,%205-8%20Juin%202012.&rft.jtitle=Untitled&rft.date=2012&rft.volume=-&rft.au=BOURDA,%20G.&rft.genre=unknown


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