J/A+A/684/A29ivo://CDS.VizieR/J/A+A/684/A29doi:10.26093/cds/vizier.36840029CDSVerberne S.Koposov S.E.Rossi E.M.Marchetti T.Kuijken K.Penoyre Z.2024-11-07T20:02:46Z2024-04-03T07:54:02ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frhigh-velocity-starsradial-velocityvisible-astronomyThe Gaia mission has provided us full astrometric solutions for over 1.5B sources. However, only the brightest 34M of those have radial velocity measurements. As a proof of concept, this paper aims to close that gap, by obtaining radial velocity estimates from the low- resolution BP/RP spectra that Gaia now provides. These spectra are currently published for about 220M sources, with this number increasing to the full ~2B Gaia sources with Gaia Data Release 4. To obtain the radial velocity measurements, we fit Gaia BP/RP spectra with models based on a grid of synthetic spectra, with which we obtain the posterior probability on the radial velocity for each object. Our measured velocities show systematic biases that depend mainly on colours and magnitudes of stars. We correct for these effects by using external catalogues of radial velocity measurements. We present in this work a catalogue of about 6.4M sources with our most reliable radial velocity measurements and uncertainties <300 km s^-1 obtained from the BP/RP spectra. About 23% of these have no previous radial velocity measurement in Gaia RVS. Furthermore, we provide an extended catalogue containing all 125M sources for which we were able to obtain radial velocity measurements. The latter catalogue, however, also contains a fraction of measurements for which the reported radial velocities and uncertainties are inaccurate. Although typical uncertainties in the catalogue are significantly higher compared to those obtained with precision spectroscopy instruments, the number of potential sources for which this method can be applied is orders of magnitude higher than any previous radial velocity catalogue. Further development of the analysis could therefore prove extremely valuable in our understanding of Galactic dynamics.2024A&A...684A..29Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. 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Should Not be used for identification.meta.recordintGaiaDR3Gaia DR3 source_idmeta.id;meta.mainRA_ICRSRigth ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainindexedRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordoubleJ/A+A/684/A29/extendExtended CataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordGaiaDR3Gaia DR3 source_idmeta.id;meta.mainRA_ICRSRigth ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainindexedRVCalibrated XP radial velocitykm/sphys.veloc;pos.heliocentricdoublee_RV? Calibrated XP radial velocity errorkm/sstat.errordoublenullableOffset? Offset applied to the original radial velocity measurement during calibrationkm/sphys.veloc;arith.diffdoublenullableUnderFactor? Underestimation factor applied to the measured uncertaintiesstat.fit.paramdoublenullablerchi2Reduced chi squared of our best fit modelstat.fit.chi2;stat.param;meta.modelleddoubleNoiseFloor? Noise floor applied to the measured uncertaintieskm/sstat.snr;instr.det.noisedoublenullableCMDoutfrac? CMD outlier fraction of stars in colour-mag-extinction(-log g) range that are considered outliersstat.fit.paramdoublenullableBadMeasProbability of a bad measurement based on the Random Forest Classifierstat.fit.goodnessfloatwarningWarning flag to indicate potentially problematic radial velocity measurementsmeta.codeintTeffEffective temperature of the best fit model for radial velocityKphys.temperature.effective;meta.modelledintloggSurface gravity of the best fit model for radial velocitylog(cm.s**-2)phys.gravity;meta.modelleddouble[Fe/H]Metallicity of the best fit model for radial velocityphys.abund.Z;meta.modelleddoubleSkewSkewness of the radial velocity posteriorstat.fit.paramdouble