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Table: gaia_dr3.qso_candidates
(The bold columns are indexed columns)
Column NameDescriptionDatatype
astrometric_selection_flagThis flag indicates whether the source is part of the astrometric selection of the qso_candidates table that was constructed based on the principles originally that were used to select the sources defining the Gaia-CRF3 and published in agn_cross_id. See also Klioner et al. (2021).SMALLINT
ccfratio_qsocValue of the cross-correlation function used to derive the redshift from QSOC, relative to the maximum valueDOUBLE
classlabel_dscClass assigned by DSC based on the probability from its Combmod classifierCHAR
classlabel_dsc_jointClass assigned by DSC based on the probability from its Specmod and Allosmod classifiersCHAR
classlabel_oaClass label of the neuron that represents the source, as assigned by the OA module in ApsisCHAR
classprob_dsc_combmod_galaxyProbability from DSC-Combmod of being a galaxy (data used: BP/RP spectrum, photometry, astrometry)DOUBLE
classprob_dsc_combmod_quasarProbability from DSC-Combmod of being a quasar (data used: BP/RP spectrum, photometry, astrometry)DOUBLE
ellipticity_hostgalaxyEllipticity (defined as 1-(b/a) where (b/a) is the axis ratio) of the host galaxy obtained by the morphological fitting of a Sersic profile for the host galaxyDOUBLE
ellipticity_hostgalaxy_errorFormal uncertainty on the ellipticity of the host galaxy as obtained by the morphological fitting of a Sersic profile.DOUBLE
flags_qsocProcessing flags for the analysis based on BP/RP Spectra from QSOCBIGINT
fractional_variability_gFractional variability in the G bandDOUBLE
gaia_crf_sourceThis boolean flag indicates whether the source is part of the Gaia-CRF3, which is published through agn_cross_id. See also Klioner et al. (2021).SMALLINT
host_galaxy_detectedFlag indicating the presence of a detectable host galaxy. False means that no host galaxy could be detected, while True means that a measurable host galaxy was detected around the quasar.SMALLINT
host_galaxy_flagThis flag provides information about the processing or scientific quality of the results of the Quasar morphology analysis chain for the source of interest.INTEGER
intensity_hostgalaxyLight intensity at the center of the host galaxy as obtained by fitting an exponential profile for the central quasar and a Sersic profile for the host galaxy.DOUBLE
intensity_hostgalaxy_errorFormal uncertainty on the light intensity of the host galaxy at the effective radius as obtained by fitting an exponential profile for the central quasar and a Sersic profile for the host galaxy.DOUBLE
intensity_quasarLight intensity at the center of the quasar as obtained by fitting an exponential profile for the central quasar and a Sersic profile for the host galaxy.DOUBLE
intensity_quasar_errorUncertainty on the light intensity at the center of the quasar as obtained by fitting an exponential profile for the central quasar and a Sersic profile for the host galaxy.DOUBLE
l2_normThis value represents the mean squared error between the integrated flux of all observed samples (from the Sky Mapper and Astrometric Field) and the integrated flux of synthetic samples produced with the fitted profile.DOUBLE
morph_params_corr_vecVector form of the upper triangle of the correlation matrix for the fitted morphological parametersCHAR
n_transitsThe number of transits used to reconstruct the image and to analyse the object morphology.SMALLINT
non_qso_variabilityNon-quasar variability metric in the G bandDOUBLE
posangle_hostgalaxyPosition angle of the host galaxy obtained by the morphological fitting of the Sersic profile with respect to Celestial North Pole.DOUBLE
posangle_hostgalaxy_errorFormal uncertainty on the position angle of the host galaxy obtained by the morphological fitting of the Sersic profile with respect to Celestial North Pole.DOUBLE
qso_variabilityQuasar variability metric in the G bandDOUBLE
radius_hostgalaxyEffective radius containing half of the total luminosity of the Sersic profile used to fit the host galaxyDOUBLE
radius_hostgalaxy_errorUncertainty on the effective radius containing half of the total luminosity of the Sersic profile used to fit the host galaxy.DOUBLE
random_idRandom ID in the range 0.0 => 100.0 (not unique)REAL
redshift_qsocThe redshift of the source estimated from the analysis of the BP/RP spectra by the QSOC Apsis moduleDOUBLE
redshift_qsoc_lowerLower confidence level of the redshift estimate based on the BP/RP spectra analysis. This is the 16th percentile of the PDF over redshift as computed by QSOCDOUBLE
redshift_qsoc_upperUpper confidence level of the redshift estimate based on the BP/RP spectra analysis. This is the 84th percentile of the PDF over redshift as computed by QSOCDOUBLE
sersic_indexSersic index as obtained by fitting a Sersic profile for the host galaxy. The Sersic profile is a mathematical function that describes how the intensity of a galaxy varies with the distance from its center. The Sersic index describes how steep is this variation.DOUBLE
sersic_index_errorFormal uncertainty on sersic_index.DOUBLE
solution_idSolution identifierBIGINT
source_idUnique source identifier (unique within a particular Data Release)BIGINT
source_selection_flagsBit indicative of whether the input data from a given module met the source list eligibility criteria for the source of interest.SMALLINT
structure_function_indexIndex of the first-order structure function in the G bandDOUBLE
structure_function_index_scatterStandard deviation of the index of the structure functionDOUBLE
vari_agn_membership_scoreMembership score (0=lowest,1=highest) of source to be of AGN typeDOUBLE
vari_best_class_nameBest class name with corresponding classification score in best_class_score. For the n_transits:5+ classifier in DR3, the following classes are published: ACV|CP|MCP|ROAM|ROAP, ACYG, AGN, BCEP, BE|GCAS|SDOR|WR, CEP, CV, DSCT|GDOR|SXPHE, ECL, ELL, EP, LPV, MICROLENSING, RCB, RR, RS, S, SDB, SN, SOLAR_LIKE, SPB, SYST, WD, and YSO. The GALAXY classifications are largely due to artificial variability.CHAR
vari_best_class_scoreIt describes a quantity between 0 and 1 which is related to the (median) normalised rank of the confidence of the classifier(s) in the identification of the best class (vari_best_class_name). In the special case of class EP, all scores are set to 1.DOUBLE
zscore_qsocRedshift zscore from QSOCDOUBLE