The Gaia hybrid catalogue, a leverage to find Galactic structures

M. Fouesneau (MPIA, Heidelberg, Germany)

The undergoing Gaia mission will undertake an astrometric, photometric and spectroscopic survey of the Galaxy. The Gaia consortium will use the direct data, or gaia data only, to classify objects and estimate their individual astrophysical parameters. However, one can achieve more reliable estimates of stellar parameters by combining Gaia data with data from other spectroscopic and photometric surveys.
The Gaia ``hybrid catalog'' project will provide an exquisite value-added catalogs of astrophysical parameters for Gaia targets by taking into account the ``obvious'' non-Gaia data (\eg, SDSS, WISE, Pan-STARRS, APOGEE). By including spectroscopic metallicity determinations when available, or infrared photometry will allow us to break through the degeneracies between extinction and temperature that hampers the accuracy of studying astrophysical parameters of individual stars. While I will demonstrate the leverage that Gaia can offer when combined with other datasets, I will also highlight the challenges of making such hybrid catalogs. I will show the sensitivity to finding highly disrupted star clusters and its members by combining photometry outside the Gaia coverage and proper motions.

Topic revision: r1 - 2014-11-28 - SusanaBascon
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