Quasars and the Gaia preliminary first data release

International Conference on Astrophysics and Particle Physics

December 08-10, 2016 Dallas, Texas, USA

Alexandre Humberto Andrei

Observat�³rio Nacional/MCTI, Brazil
Pierre-and-Marie-Curie University, France
Universidade Federal do Rio de Janeiro, Brazil

Posters & Accepted Abstracts: J Astrophys Aerospace Technol

Abstract :

The Gaia preliminary first data release (GDR1) is scheduled for the forthcoming September 16th, once complied the internal data validation. It will bring positions and G magnitudes, and the respective errors, for about 90% of the sky observable by Gaia. In addition a full astrometric solution will be given for the Tycho2 stars. As much as, it still is far away from the endof- mission Galactic census, by a comparable much the GDR1 will be ahead away from the astrometric catalogues existing at the time of its release. In particular, we will detail the use of QSOs from the Gaia initial QSO catalogue (GIQC) to establish the celestial reference frame for the GDR1, and to set up the zero-point enabling to disentangle parallaxes from proper motions in the Gaia-Tycho2 full solution. Tied to this the GIQC is reviewed, with emphasis on its sky distribution, and the quality assessment, morphology and variability flags. Finally, an ongoing investigation on the proprieties of the QSOs spectral energy distribution (SED) is presented, including a new algorithm for the determination of absolute magnitudes. It is derived from the Gaia spectral library and it is thus important to interpret the QSOs luminosity function from the more than half a million QSOs that Gaia is expected to detect.

Biography :

Email: oat1@ov.ufrj.br