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Remarks of Gaia DR1 magnitude using ground-based optical monitoring of QSOs

Published online by Cambridge University Press:  07 March 2018

Goran Damljanović ,
François Taris  and
Alexandre Andrei
Goran Damljanović
Affiliation:
Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia email: gdamljanovic@aob.rs
François Taris
Affiliation:
Observatoire de Paris - SYRTE, CNRS/UPMC, 61 av. de l'Observatoire, 75014 Paris, France email: Francois.Taris@obspm.fr
Alexandre Andrei
Affiliation:
Observatório Nacional/MCTI, Rua Gal. José Cristino 77, Rio de Janeiro, RJ CEP 20921-400, Brasil email: oat1@ov.ufrj.br
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Abstract

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Since September 2016, the first release (DR1) of the Gaia catalogue was appeared. The optical Gaia positions of sources will be linked to the ICRF (VLBI radio positions of mostly quasars, QSOs). For high accurate link we need to investigate variations of optical flux of QSOs via their magnitude variations using data of ground-based telescopes. To do that, from 2013 we observed 47 QSOs and other sources; nine optical telescopes were used for that monitoring. To increase the total number of objects for the link, after a first set of 70 objects (Bourda et al. 2008), Bourda et al. (2011) established a second set of 47 objects. It is necessary to investigate the photometry and morphology of these objects. We collected ground-based data of QSOs (B, V and R mag) and compared with G mag of Gaia DR1; some results are presented here.

Keywords

Astrometryreference systemsquasars: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 88 - 89
Copyright
Copyright © International Astronomical Union 2018 

References

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Taris, F. et al., 2013, Astronomy and Astrophysics, 552, A98 Google Scholar
Taris, F. et al., 2016, Astronomy and Astrophysics, 587, A112 Google Scholar