Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3

被引：1722

作者：

Bailer-Jones, C. A. L. ^{[1
]}

Rybizki, J. ^{[1
]}

Fouesneau, M. ^{[1
]}

Demleitner, M. ^{[2
]}

Andrae, R. ^{[1
]}

机构：

[1] Max Planck Inst Astron, Heidelberg, Germany

[2] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Heidelberg, Germany

来源：

ASTRONOMICAL JOURNAL | 2021年 / 161卷 / 03期

关键词：

Catalogs; Galaxy structure; Bayesian statistics; Parallax; Stellar parallax; Photometric parallax; Distance indicators; Astrometry; Markov chain Monte Carlo; Absolute magnitude; MILKY;

D O I：

10.3847/1538-3881/abd806

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Stellar distances constitute a foundational pillar of astrophysics. The publication of 1.47 billion stellar parallaxes from Gaia is a major contribution to this. 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. We infer two types of distance. The first, geometric, uses the parallax with a direction-dependent prior on distance. The second, photogeometric, additionally uses the color and apparent magnitude of a star, by exploiting the fact that stars of a given color have a restricted range of probable absolute magnitudes (plus extinction). Tests on simulated data and external validations show that the photogeometric estimates generally have higher accuracy and precision for stars with poor parallaxes. We provide a catalog of 1.47 billion geometric and 1.35 billion photogeometric distances together with asymmetric uncertainty measures. Our estimates are quantiles of a posterior probability distribution, so they transform invariably and can therefore also be used directly in the distance modulus (5 log(10) r - 5). The catalog may be downloaded or queried using ADQL at various sites (see http://www.mpia.de/similar to calj/gedr3_distances.html), where it can also be cross-matched with the Gaia catalog.

引用

页数：24

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