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Bayesian Cross-Matching of High Proper Motion Stars in Gaia DR2 and Photometric Metallicities for $\sim$1.7 million K and M Dwarfs
- Publication Year :
- 2021
-
Abstract
- We present a Bayesian method to cross-match 5,827,988 high proper motion Gaia sources ($\mu>40 \ mas \ yr^{-1}$) to various photometric surveys: 2MASS, AllWISE, GALEX, RAVE, SDSS and Pan-STARRS. To efficiently associate these objects across catalogs, we develop a technique that compares the multidimensional distribution of all sources in the vicinity of each Gaia star to a reference distribution of random field stars obtained by extracting all sources in a region on the sky displaced 2$^\prime$. This offset preserves the local field stellar density and magnitude distribution allowing us to characterize the frequency of chance alignments. The resulting catalog with Bayesian probabilities $>$95% has a marginally higher match rate than current internal Gaia DR2 matches for most catalogs. However, a significant improvement is found with Pan-STARRS, where $\sim$99.8% of the sample within the Pan-STARRS footprint is recovered, as compared to a low $\sim$20.8% in Gaia DR2. Using these results, we train a Gaussian Process Regressor to calibrate two photometric metallicity relationships. For dwarfs of $3500<br />Comment: 51 pages, 23 figures
- Subjects :
- Physics
Proper motion
010308 nuclear & particles physics
Bayesian probability
FOS: Physical sciences
Astronomy and Astrophysics
Astrometry
Astrophysics
01 natural sciences
Astrophysics - Astrophysics of Galaxies
Stars
Cross matching
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
Astrophysics - Instrumentation and Methods for Astrophysics
010303 astronomy & astrophysics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
Solar and Stellar Astrophysics (astro-ph.SR)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....9473ef3b0f7be0bd1e1f16c3799b1c76