Mignard, F; Klioner, S A; Lindegren, L; Hernández, J; Bastian, U; Bombrun, A; Hobbs, D; Lammers, U; Michalik, D; Ramos-Lerate, M; Žerjal, Maruša
Context. The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines a kinematically non-rotating reference frame in the optical domain. A subset of these quasars have accurate VLBI positions that allow the axes of the reference frame to be aligned with the International Celestial Reference System (ICRF) radio frame. Aims. We describe the astrometric and photometric properties of the quasars that were selected to...[Show more]
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