Establishing celestial reference frames at different ranges of wavelengths",

Chopo Ma A. Andrei 1 G. Bourda 2 C. Jacobs
2 M2A 2011
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : The current fundamental celestial reference frame is the second realization of the International Celestial Reference Frame (ICRF2) derived from dual frequency VLBI observations at 13/3.6 cm. The ICRF2 catalog includes ∼3000 compact radio sources, largely quasars, of which 295 defining sources establish the coordinate axes with an accuracy of ∼10 microarcseconds. More limited catalogs have been developed at 1.2 cm using the VLBA (∼300 sources) and at 3.6/0.9 cm using the Deep Space Network (∼500 sources), primarily to support spacecraft navigation. Anticipating the prospective Gaia optical catalogue, a set of ∼400 radio weak but optically bright (V ≤ 18) objects is being studied at 13/3.6 cm for the radio-optical frame tie using the high sensitivity of the EVN + VLBA. The Gaia QSO catalog currently has ∼100,000 defining objects whose morphology and variability are being tabulated. The characteristics, limitations and future development of the various wavelength catalogs will be discussed along with the anticipated radio-optical frame transfer.
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Contributeur : Marie-Paule Pomies <>
Soumis le : jeudi 15 mai 2014 - 13:47:40
Dernière modification le : vendredi 6 juillet 2018 - 15:06:09


  • HAL Id : hal-00991477, version 1


Chopo Ma, A. Andrei, G. Bourda, C. Jacobs. Establishing celestial reference frames at different ranges of wavelengths",. -, 2011, Saint-Petersbourg, Russia. 1, 2011. 〈hal-00991477〉



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