MA, Chopo; ANDREI, A.; BOURDA, G.; JACOBS, C.

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MA, Chopo

ANDREI, A.
Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]

BOURDA, G.
M2A 2011

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JENAM 2011, Saint-Pétersbourg - Russie, 4-8 Juillet 2011., JENAM 2011, Saint-Pétersbourg - Russie, 4-8 Juillet 2011., 2011, Saint-Petersbourg. 2011, vol. 1

Resumen en inglés

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.< Leer menos

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804