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Table: gaia_dr3.qso_candidates
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| astrometric_selection_flag | This 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_qsoc | Value of the cross-correlation function used to derive the redshift from QSOC, relative to the maximum value | DOUBLE |
| classlabel_dsc | Class assigned by DSC based on the probability from its Combmod classifier | CHAR |
| classlabel_dsc_joint | Class assigned by DSC based on the probability from its Specmod and Allosmod classifiers | CHAR |
| classlabel_oa | Class label of the neuron that represents the source, as assigned by the OA module in Apsis | CHAR |
| classprob_dsc_combmod_galaxy | Probability from DSC-Combmod of being a galaxy (data used: BP/RP spectrum, photometry, astrometry) | DOUBLE |
| classprob_dsc_combmod_quasar | Probability from DSC-Combmod of being a quasar (data used: BP/RP spectrum, photometry, astrometry) | DOUBLE |
| ellipticity_hostgalaxy | Ellipticity (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 galaxy | DOUBLE |
| ellipticity_hostgalaxy_error | Formal uncertainty on the ellipticity of the host galaxy as obtained by the morphological fitting of a Sersic profile. | DOUBLE |
| flags_qsoc | Processing flags for the analysis based on BP/RP Spectra from QSOC | BIGINT |
| fractional_variability_g | Fractional variability in the G band | DOUBLE |
| gaia_crf_source | This 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_detected | Flag 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_flag | This 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_hostgalaxy | Light 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_error | Formal 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_quasar | 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 |
| intensity_quasar_error | Uncertainty 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_norm | This 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_vec | Vector form of the upper triangle of the correlation matrix for the fitted morphological parameters | CHAR |
| n_transits | The number of transits used to reconstruct the image and to analyse the object morphology. | SMALLINT |
| non_qso_variability | Non-quasar variability metric in the G band | DOUBLE |
| posangle_hostgalaxy | Position angle of the host galaxy obtained by the morphological fitting of the Sersic profile with respect to Celestial North Pole. | DOUBLE |
| posangle_hostgalaxy_error | Formal 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_variability | Quasar variability metric in the G band | DOUBLE |
| radius_hostgalaxy | Effective radius containing half of the total luminosity of the Sersic profile used to fit the host galaxy | DOUBLE |
| radius_hostgalaxy_error | Uncertainty on the effective radius containing half of the total luminosity of the Sersic profile used to fit the host galaxy. | DOUBLE |
| random_id | Random ID in the range 0.0 => 100.0 (not unique) | REAL |
| redshift_qsoc | The redshift of the source estimated from the analysis of the BP/RP spectra by the QSOC Apsis module | DOUBLE |
| redshift_qsoc_lower | Lower 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 QSOC | DOUBLE |
| redshift_qsoc_upper | Upper 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 QSOC | DOUBLE |
| sersic_index | Sersic 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_error | Formal uncertainty on sersic_index. | DOUBLE |
| solution_id | Solution identifier | BIGINT |
| source_id | Unique source identifier (unique within a particular Data Release) | BIGINT |
| source_selection_flags | Bit indicative of whether the input data from a given module met the source list eligibility criteria for the source of interest. | SMALLINT |
| structure_function_index | Index of the first-order structure function in the G band | DOUBLE |
| structure_function_index_scatter | Standard deviation of the index of the structure function | DOUBLE |
| vari_agn_membership_score | Membership score (0=lowest,1=highest) of source to be of AGN type | DOUBLE |
| vari_best_class_name | Best 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_score | It 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_qsoc | Redshift zscore from QSOC | DOUBLE |
