scispace - formally typeset
Open AccessJournal ArticleDOI

Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2

TLDR
In this paper, the authors used a weak distance prior that varies smoothly as a function of Galactic longitude and latitude according to a Galaxy model to infer distances to essentially all 1.33 billion stars with parallaxes published in the second Gaia data release.
Abstract
For the vast majority of stars in the second Gaia data release, reliable distances cannot be obtained by inverting the parallax. A correct inference procedure must instead be used to account for the nonlinearity of the transformation and the asymmetry of the resulting probability distribution. Here we infer distances to essentially all 1.33 billion stars with parallaxes published in the second \gaia\ data release. This is done using a weak distance prior that varies smoothly as a function of Galactic longitude and latitude according to a Galaxy model. The irreducible uncertainty in the distance estimate is characterized by the lower and upper bounds of an asymmetric confidence interval. Although more precise distances can be estimated for a subset of the stars using additional data (such as photometry), our goal is to provide purely geometric distance estimates, independent of assumptions about the physical properties of, or interstellar extinction towards, individual stars. We analyse the characteristics of the catalogue and validate it using clusters. The catalogue can be queried on the Gaia archive using ADQL at this http URL and downloaded from this http URL .

read more

Citations
More filters
Journal ArticleDOI

Stellar Population Astrophysics (SPA) with TNG. The old open clusters Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171

TL;DR: In this paper, the spectral properties of four sparsely studied open clusters, namely Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171, were analyzed using the EW measurement approach.
Journal ArticleDOI

Evidence of Hubble flow-like motion of young stellar populations away from the Perseus arm

TL;DR: In this article, the authors presented evidence of coherent outward motion of a sample of young stars in the Perseus Arm, whose apparent origin is located in the vicinity of the W3/W4/W5 complex.
Journal ArticleDOI

NuSTAR observation of the supergiant fast X-ray transient IGR J11215−5952 during its 2017 outburst

TL;DR: In this article, the authors report on the results of a NuSTAR observation of the supergiant fast X-ray transient pulsar IGR J11215−5952 during the peak of its outburst in June 2017.
Journal ArticleDOI

Observational Signatures of Tightly Wound Spirals Driven by Buoyancy Resonances in Protoplanetary Disks

TL;DR: In this article, it was shown that the collision-limited slow thermal relaxation provides favorable conditions for buoyancy resonances to develop, and it was also shown that these resonances can be driven by a (sub-)Jovian-mass planet at 90 au.
Journal ArticleDOI

Distance, magnetic field and kinematics of a filamentary cloud LDN 1157

TL;DR: In this article, the inter-cloud magnetic field geometry of the region surrounding LDN 1157 was mapped to investigate its relationship with the cloud morphology, with the outflow direction and with the core magnetic field (CMF) geometry inferred from the mm-and sub-mm polarization results from the literature.
References
More filters
Journal ArticleDOI

Gaia Data Release 2: Observational Hertzsprung-Russell diagrams

C. Babusiaux, +451 more
TL;DR: In this article, the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD) was highlighted, depending in particular on stellar population selections.
Journal ArticleDOI

Gaia Early Data Release 3: Summary of the contents and survey properties

TL;DR: Gaia DR2 as mentioned in this paper is the second Gaia data release, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21.
Journal ArticleDOI

Gaia Data Release 2: Catalogue validation

TL;DR: The second Gaia data release (DR2) contains very precise astrometric and photometric properties for more than one billion sources, astrophysical parameters for dozens of millions, radial velocities for millions, variability information for half a million of stellar sources and orbits for thousands of solar system objects as discussed by the authors.
Journal ArticleDOI

Estimating Distances from Parallaxes

TL;DR: In this paper, the authors investigate the properties and performance of various prior assumptions and examine their implications, and demonstrate that a simple prior which decreases asymptotically to zero at infinite distance has good performance, accommodates nonpositive parallaxes, and does not require a bias correction.
Journal ArticleDOI

Gaia Data Release 2: using Gaia parallaxes

TL;DR: The main recommendation is to always treat the derivation of (astro-)physical parameters from astrometric data, in particular when parallaxes are involved, as an inference problem which should preferably be handled with a full Bayesian approach.
Related Papers (5)

Gaia Data Release 2. Summary of the contents and survey properties

Anthony G. A. Brown, +452 more