{"paper":{"title":"Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A three-dimensional model of the Galaxy provides priors for estimating reliable distances to 1.47 billion stars from Gaia parallaxes.","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"(2) Astronomisches Rechen-Institut, C. A. L. Bailer-Jones (1), Heidelberg, Heidelberg), J. Rybizki (1), M. Demleitner (2), M. Fouesneau (1), R. Andrae (1) ((1) Max Planck Institute for Astronomy","submitted_at":"2020-12-09T18:35:15Z","abstract_excerpt":"Stellar distances constitute a foundational pillar of astrophysics. The publication of 1.47 billion stellar parallaxes from Gaia is a major contribution to this. Yet despite Gaia's precision, the majority of these stars are so distant or faint that their fractional parallax uncertainties are large, thereby precluding a simple inversion of parallax to provide a distance. Here we take a probabilistic approach to estimating stellar distances that uses a prior constructed from a three-dimensional model of our Galaxy. This model includes interstellar extinction and Gaia's variable magnitude limit. 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