Gaia Data Release 2. Cross-match with external catalogues - Algorithms and results

Abstract

Context. Although the Gaia catalogue on its own is a very powerful tool, it is the combination of this high-accuracy archive with other archives that will truly open up amazing possibilities for astronomical research. The advanced interoperation of archives is based on cross-matching, leaving the user with the feeling of working with one single data archive. The data retrieval should work not only across data archives but also across wavelength domains. The first step for a seamless access to the data is the computation of the cross-match between Gaia and external surveys. Aims. We describe the adopted algorithms and results of the pre-computed cross-match of the Gaia Data Release 2 (DR2) catalogue with dense surveys (Pan-STARRS1 DR1, 2MASS, SDSS DR9, GSC 2.3, URAT-1, allWISE, PPMXL, and APASS DR9) and sparse catalogues (Hipparcos2, Tycho-2, and RAVE 5). Methods. A new algorithm is developed specifically for sparse catalogues. Improvements and changes with respect to the algorithm adopted for DR1 are described in detail. Results. The outputs of the cross-match are part of the official Gaia DR2 catalogue. The global analysis of the cross-match results is also presented.

accepted for publication in A&A Gaia DR2 special issue

References in corpus (10)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
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• Gaia Data Release 2: The astrometric solution
• Gaia Data Release 2: Catalogue validation
• The Second-Generation Guide Star Catalog: Description and Properties
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• Gaia Data Release 2: The Celestial reference frame (Gaia-CRF2)
• PPM-Extended (PPMX) - a catalogue of positions and proper motions
• Gaia Data Release 1. Cross-match with external catalogues - Algorithm and results

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