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The LQAC-4, last update of the Large Quasar Astrometric Catalogue

  • J. Souchay (a1), A. H. Andrei (a2), C. Barache (a1), F. Taris (a1), C. Gattano (a1) and B. Coelho (a2)...

Abstract

Thanks to their point-like structure and to their lack of significant proper motion, quasars represent the ideal objects for modeling quasi-inertial directions in space. For that reason the present primary conventional reference frame, the ICRF-2, is constructed from the set of the celestial coordinates of a sample of extragalactic objects, whose the very large majority are quasars. Thus any newly discovered quasar must be considered as a potential future ideal astrometric marker. Therefore compiling all the recorded quasars at a given epoch looks as a useful task. This constitutes the aim of the LQAC (Large Quasar Astrometric Catalogue). We present here the contents of the future release of this catalogue quoted as the LQAC-4, insisting on the related strategy of compilation. Preliminary results concerning the cross-identification with the Gaia DR1 catalogue are emphasized

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The LQAC-4, last update of the Large Quasar Astrometric Catalogue

  • J. Souchay (a1), A. H. Andrei (a2), C. Barache (a1), F. Taris (a1), C. Gattano (a1) and B. Coelho (a2)...

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