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gaia data release 3 documentation

17.1 Catalogue statistics

17.1.3 Extragalactic objects

galaxy_candidates table

The data fields of galaxy_candidates are described in Section 20.5.1. Statistics are provided in Table 17.10, and a selection of plots in Section 17.2.14.

Table 17.10: galaxy_candidates. Statistics for numeric catalogue fields for 4 842 342 candidates. Arrays in a data record are represented by their average (.avg), length (.len), maximum (.max), median (.med), minimum (.min) and the number of NaN elements (.nan), and the statistics are formed over these values.
Field name Null values Minimum Maximum Mean Std. dev.
classprob_dsc_combmod_galaxy 543 0 1 0.721 0.415
classprob_dsc_combmod_quasar 543 0 1 0.0094 0.055
ellipticity_de_vaucouleurs 4150258 4.45e-08 0.897 0.266 0.137
ellipticity_de_vaucouleurs_error 4150258 1.03e-12 0.226 0.000525 0.00399
ellipticity_sersic 4150258 8.36e-07 0.895 0.271 0.139
ellipticity_sersic_error 4150258 3.7e-12 0.28 0.0117 0.0186
flags_de_vaucouleurs 3927505 1 8 6.43 1.01
flags_sersic 3927505 1 8 6.14 0.909
intensity_de_vaucouleurs 3927505 0.00912 9.68 0.152 0.0791
intensity_de_vaucouleurs_error 3927505 1e-12 1.48 0.000113 0.00321
intensity_sersic 3927505 0.00202 3.96 0.0906 0.131
intensity_sersic_error 3927505 3.44e-12 6.37 0.00199 0.011
l2_de_vaucouleurs 3927505 0.338 16.3 0.77 0.182
l2_sersic 3927505 0.334 16.3 0.758 0.178
morph_params_corr_vec_de_vaucouleurs 3927505 nan nan nan nan
morph_params_corr_vec_de_vaucouleurs.avg 3927505 -1 1 -0.304 0.427
morph_params_corr_vec_de_vaucouleurs.len 3927505 6 6 6 0
morph_params_corr_vec_de_vaucouleurs.max 3927505 -1 1 0.398 0.794
morph_params_corr_vec_de_vaucouleurs.med 3927505 -1 1 -0.366 0.481
morph_params_corr_vec_de_vaucouleurs.min 3927505 -1 1 -0.916 0.236
morph_params_corr_vec_de_vaucouleurs.nan 3927505 0 5 1.23 2.15
morph_params_corr_vec_sersic 3927505 nan nan nan nan
morph_params_corr_vec_sersic.avg 3927505 -0.5 1 -0.146 0.145
morph_params_corr_vec_sersic.len 3927505 10 10 10 0
morph_params_corr_vec_sersic.max 3927505 -0.49 1 0.772 0.242
morph_params_corr_vec_sersic.med 3927505 -1 1 -0.213 0.348
morph_params_corr_vec_sersic.min 3927505 -1 1 -0.925 0.12
morph_params_corr_vec_sersic.nan 3927505 0 7 1.74 3.01
n_sersic 3927505 0.892 8 5.69 1.7
n_sersic_error 3927505 7.72e-13 1.61 0.101 0.151
n_transits 0 0 132 6.7 14.6
posangle_de_vaucouleurs 4154449 0.0151 180 89.5 50.2
posangle_de_vaucouleurs_error 4154449 1.04e-09 123 0.228 2.53
posangle_sersic 4159024 0.0021 180 89.6 49.8
posangle_sersic_error 4159024 2.79e-09 127 3.94 11.5
radius_de_vaucouleurs 3927505 91.4 8e+03 1.48e+03 920
radius_de_vaucouleurs_error 3927505 1.24e-12 1.47e+03 4.09 35.2
radius_sersic 3927505 119 8e+03 2.89e+03 1.86e+03
radius_sersic_error 3927505 1.01e-12 3.02e+03 198 306
redshift_ugc 3475189 -0.036 0.598 0.146 0.0687
redshift_ugc_lower 3475189 -0.029 0.43 0.103 0.0506
redshift_ugc_upper 3475189 0.033 0.624 0.171 0.0667
solution_id 0 1.64e+18 1.64e+18 1.64e+18 0
source_id 0 3.68e+12 6.92e+18 3.62e+18 1.95e+18
source_selection_flags 0 1 29 12.9 9.3
vari_best_class_score 2365069 7.17e-06 1 0.732 0.257

galaxy_catalogue_name table

The data fields of galaxy_catalogue_name are described in Section 20.5.2 and statistics are provided in Table 17.11.

Table 17.11: galaxy_catalogue_name. Statistics for numeric fields for the 914 837 sources.
Field name Null values Minimum Maximum Mean Std. dev.
catalogue_id 0 1 1 1 0
solution_id 0 1.64e+18 1.64e+18 1.64e+18 0
source_id 0 1.18e+16 6.92e+18 3.36e+18 1.94e+18

qso_candidates table

The data fields of qso_candidates are described in Section 20.5.3. Statistics are provided in Table 17.12, and a selection of plots in Section 17.2.14.

Table 17.12: qso_candidates. Statistics for numeric fields for the 6 649 162 candidates. Arrays in a data record are represented by their average (.avg), length (.len), maximum (.max), median (.med), minimum (.min) and the number of NaN elements (.nan), and the statistics are formed over these values.
Field name Null values Minimum Maximum Mean Std. dev.
astrometric_selection_flag 0 0 1 0.285 0.452
ccfratio_qsoc 274099 0.123 1 0.883 0.161
classprob_dsc_combmod_galaxy 1651 0 1 0.0269 0.14
classprob_dsc_combmod_quasar 1651 0 1 0.743 0.358
ellipticity_hostgalaxy 6637630 0.01 0.789 0.347 0.165
ellipticity_hostgalaxy_error 6637630 3.45e-10 0.0603 0.00219 0.00469
flags_qsoc 274099 0 31 21.1 8.28
fractional_variability_g 5776934 4.49e-05 1.08 0.1 0.0593
gaia_crf_source 0 0 1 0.243 0.429
host_galaxy_detected 0 0 1 0.0097 0.098
host_galaxy_flag 5564914 1 6 3.51 1.12
intensity_hostgalaxy 6635226 0.0167 17.1 0.303 0.392
intensity_hostgalaxy_error 6635226 9.99e-11 0.506 0.00158 0.00987
intensity_quasar 6633295 2.38 1.31e+03 46 28.5
intensity_quasar_error 6633299 5.62e-13 6.83 0.0677 0.211
l2_norm 6633295 0.483 34.1 1.08 0.553
morph_params_corr_vec 6633295 nan nan nan nan
morph_params_corr_vec.avg 6633295 -0.441 0.967 -0.0871 0.133
morph_params_corr_vec.len 6633295 15 15 15 0
morph_params_corr_vec.max 6633295 -0.309 1 0.76 0.235
morph_params_corr_vec.med 6633295 -1 0.96 -0.142 0.273
morph_params_corr_vec.min 6633295 -1 0.942 -0.85 0.255
morph_params_corr_vec.nan 6633295 0 14 3.92 4.93
n_transits 0 0 256 0.118 2.54
non_qso_variability 5776934 -0.0268 2.19 0.664 0.298
posangle_hostgalaxy 6637630 0.00573 180 89.5 48.7
posangle_hostgalaxy_error 6637631 4.08e-08 55.1 0.336 1.55
qso_variability 5776934 -1.41 3.11 -0.279 0.252
radius_hostgalaxy 6635226 133 2.5e+03 890 427
radius_hostgalaxy_error 6635226 8.2e-08 236 5.94 15.8
redshift_qsoc 274099 0.0827 6.13 1.99 1.41
redshift_qsoc_lower 274099 -0.0541 6.13 1.96 1.4
redshift_qsoc_upper 274099 0.0831 6.85 2.01 1.43
sersic_index 6635226 0.5 6 1.9 1.06
sersic_index_error 6635226 1.36e-09 0.221 0.0087 0.02
solution_id 0 1.64e+18 1.64e+18 1.64e+18 0
source_id 0 3.47e+12 6.92e+18 4.03e+18 1.64e+18
source_selection_flags 0 1 247 96.3 59.8
structure_function_index 5776934 -0.27 5.33 0.792 0.284
structure_function_index_scatter 5776934 0 8.49 0.321 0.149
vari_agn_membership_score 5776934 1.8e-16 0.999 0.768 0.158
vari_best_class_score 5526801 1.22e-06 1 0.549 0.295
zscore_qsoc 274099 0 1 0.821 0.208

qso_catalogue_name table

The data fields of qso_catalogue_name are described in Section 20.5.4 and statistics are provided in Table 17.13.

Table 17.13: qso_catalogue_name. Statistics for numeric fields for 2 722 093 sources.
Field name Null values Minimum Maximum Mean Std. dev.
catalogue_id 0 1 7 4.73 2.15
solution_id 0 1.64e+18 1.64e+18 1.64e+18 0
source_id 0 5.48e+13 6.92e+18 3.07e+18 1.93e+18