BP/RP low-resolution spectrophotometry (mean spectra)Gaia Data Release 3 (Gaia DR3)astrophysical parameters and source classificationradial velocities / RVS mean radial velocitiessolar system objects (SSOs) reflectance spectra and orbits
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Abstract (AI)
Context. We present the third data release of the European Space Agency’s Gaia mission, Gaia DR3. This release includes a large variety of new data products, notably a much expanded radial velocity survey and a very extensive astrophysical characterisation of Gaia sources. Aims. We outline the content and the properties of Gaia DR3, providing an overview of the main improvements in the data processing in comparison with previous data releases (where applicable) and a brief discussion of the limitations of the data in this release. Methods. The Gaia DR3 catalogue is the outcome of the processing of raw data collected with the Gaia instruments during the first 34 months of the mission by the Gaia Data Processing and Analysis Consortium. Results. The Gaia DR3 catalogue contains the same source list, celestial positions, proper motions, parallaxes, and broad band photometry in the G , G BP , and G RP pass-bands already present in the Early Third Data Release, Gaia EDR3. Gaia DR3 introduces an impressive wealth of new data products. More than 33 million objects in the ranges G RVS < 14 and 3100 < T eff < 14 500, have new determinations of their mean radial velocities based on data collected by Gaia . We provide G RVS magnitudes for most sources with radial velocities, and a line broadening parameter is listed for a subset of these. Mean Gaia spectra are made available to the community. The Gaia DR3 catalogue includes about 1 million mean spectra from the radial velocity spectrometer, and about 220 million low-resolution blue and red prism photometer BP/RP mean spectra. The results of the analysis of epoch photometry are provided for some 10 million sources across 24 variability types. Gaia DR3 includes astrophysical parameters and source class probabilities for about 470 million and 1500 million sources, respectively, including stars, galaxies, and quasars. Orbital elements and trend parameters are provided for some 800 000 astrometric, spectroscopic and eclipsing binaries. More than 150 000 Solar System objects, including new discoveries, with preliminary orbital solutions and individual epoch observations are part of this release. Reflectance spectra derived from the epoch BP/RP spectral data are published for about 60 000 asteroids. Finally, an additional data set is provided, namely the Gaia Andromeda Photometric Survey, consisting of the photometric time series for all sources located in a 5.5 degree radius field centred on the Andromeda galaxy. Conclusions. This data release represents a major advance with respect to Gaia DR2 and Gaia EDR3 because of the unprecedented quantity, quality, and variety of source astrophysical data. To date this is the largest collection of all-sky spectrophotometry, radial velocities, variables, and astrophysical parameters derived from both low- and high-resolution spectra and includes a spectrophotometric and dynamical survey of SSOs of the highest accuracy. The non-single star content surpasses the existing data by orders of magnitude. The quasar host and galaxy light profile collection is the first such survey that is all sky and space based. The astrophysical information provided in Gaia DR3 will unleash the full potential of Gaia ’s exquisite astrometric, photometric, and radial velocity surveys.
Key Findings
1
About 10 million sources have epoch-photometry analyses across 24 variability types, and astrophysical parameters for ~470 million sources are provided.
2
Gaia DR3 processes 34 months of mission data and retains the source list, positions, proper motions, parallaxes, and G, GBP, GRP photometry from EDR3.
3
Gaia DR3 provides new mean radial velocities for more than 33 million objects within G_RVS < 14 and 3100 < Teff < 14500.
4
Gaia DR3 supplies orbital elements/trend parameters for ~800,000 binaries, >150,000 Solar System objects (with preliminary orbits and epochs), and reflectance spectra for ~60,000 asteroids.
5
The release includes ~1 million mean RVS spectra and ~220 million low-resolution BP/RP mean spectra made publicly available.
Research Object
Gaia Data Release 3 catalogue (Gaia DR3) and its contained astronomical source data products
Research Subject
The content, properties, and new data products of Gaia DR3 including expanded radial velocities, mean and BP/RP spectra, astrophysical parameters and classifications, variability and binary orbital data, Solar System object observations, and overall data processing improvements and limitations
Publication Details
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2022-06-10
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