Year: 2018
Type: article
Abstract: We present a catalogue of distances, masses, and ages for ∼3 million stars in the second Gaia data release with spectroscopic parameters available from the large spectroscopic surveys: APOGEE, Gaia-ESO, GALAH, LAMOST, RAVE, and SEGUE. We use a Bayesian framework to characterize the probability density functions of distance, mass, and age using photometric, spectroscopic, and astrometric information, supplemented with spectroscopic masses where available for giant stars. Furthermore, we provide posterior extinction estimates (AV) to every star using published extinction maps as a prior input. We provide an appendix with extinction coefficients for Gaia photometry derived from stellar models, which account for variation with intrinsic colour and total extinction. Our pipeline provides output estimates of the spectroscopic parameters, which can be used to inform improved spectroscopic analysis. We complement our catalogues with Galactocentric coordinates and actions with associated uncertainties. As a demonstration of the power of our catalogue, we produce velocity dispersion profiles of the disc separated by age and Galactocentric radius (between 3 and |$15\, \mathrm{kpc}$| from the Galactic centre). This suggests that the velocity dispersion profiles flatten with radius in the outer Galaxy (|$\gt\!8\, \mathrm{kpc}$|) and that at all radii the velocity dispersion follows the smooth power law with age observed in the solar neighbourhood.
Authors: Jason L Sanders, Payel Das
Institutions: University of Cambridge, University of Oxford
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, W. M. Keck Foundation, Simons Foundation, Yale University, Carnegie Institution of Washington, Vanderbilt University, Ohio State University, California Institute of Technology, University of Washington, Johns Hopkins University, Carnegie Mellon University, University of Notre Dame, University of Portsmouth, New Mexico State University, European Space Agency, York University, University of Oxford, Australian National University, Macquarie University, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Chinese Academy of Sciences, Ministério da Ciência, Tecnologia e Inovação, Javna Agencija za Raziskovalno Dejavnost RS, Istituto Nazionale di Astrofisica, Universidad Nacional Autónoma de México, National Development and Reform Commission, Nederlandse Onderzoekschool Voor Astronomie, Max-Planck-Institut für Astrophysik, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, Office of Science, University of Colorado Boulder, Smithsonian Astrophysical Observatory, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, European Research Council, Australian Research Council, Leibniz-Gemeinschaft, Australian Astronomical Optics-Macquarie, National Astronomical Observatories, Chinese Academy of Sciences, Lawrence Berkeley National Laboratory
OpenAlex ID: W2890196524