Datasets:

juliensimon
/

gaia-dr3-qso-candidates

source_id int64 3,470B 6,917,528,860B	astrometric_selection_flag bool 2 classes	gaia_crf_source bool 2 classes	vari_best_class_name large_stringclasses 22 values	vari_best_class_score float64 0 1 ⌀	fractional_variability_g float64 0 1.08 ⌀	structure_function_index float64 -0.27 5.33 ⌀	structure_function_index_scatter float64 0 8.49 ⌀	qso_variability float64 -1.41 3.11 ⌀	non_qso_variability float64 -0.03 2.19 ⌀	vari_agn_membership_score float64 0 1 ⌀	classprob_dsc_combmod_quasar float64 0 1 ⌀	classprob_dsc_combmod_galaxy float64 0 1 ⌀	classlabel_dsc large_stringclasses 6 values	classlabel_dsc_joint large_stringclasses 3 values	classlabel_oa large_stringclasses 23 values	redshift_qsoc float64 0.08 6.13 ⌀	redshift_qsoc_lower float64 -0.05 6.13 ⌀	redshift_qsoc_upper float64 0.08 6.85 ⌀	ccfratio_qsoc float64 0.12 1 ⌀	zscore_qsoc float64 0 1 ⌀	flags_qsoc int32 0 31 ⌀	host_galaxy_detected bool 2 classes	host_galaxy_flag int32 1 6 ⌀	source_selection_flags int32 1 247	high_confidence_qso bool 2 classes	has_redshift bool 2 classes
3,470,333,738,112	true	true	null	null	null	null	null	null	null	null	0.218808	0.000011	star	unclassified	QSO_Z05_15	2.982065	2.940273	3.024301	1	0.397146	21	false	null	1	false	true
5,944,234,902,272	true	true	null	null	null	null	null	null	null	null	0.297747	0.000014	star	unclassified	null	0.821335	0.809181	0.833571	1	0.922739	16	false	null	129	false	true
6,459,630,980,096	true	true	null	null	null	null	null	null	null	null	0.079004	0.427152	unclassified	unclassified	GAL_Z01_02	0.416867	0.409569	0.424203	1	0.992373	16	false	null	129	false	true
9,517,648,372,480	true	true	null	null	null	null	null	null	null	null	0.752553	0	quasar	unclassified	null	2.96768	2.919374	3.016583	0.631022	0.950714	27	false	null	65	true	true
10,655,814,178,816	true	false	AGN	0.118826	null	null	null	null	null	null	0.745768	0	quasar	unclassified	QSO_Z25_35	1.571538	1.537919	1.605602	0.590106	0.97585	26	false	null	80	true	true
10,892,037,246,720	true	true	AGN	0.846604	0.043431	1.151587	0.320949	-0.599141	0.930711	0.775407	1	0	quasar	unclassified	null	1.736468	1.726077	1.746898	1	0.995304	0	false	null	243	true	true
15,839,839,588,736	true	true	AGN	0.761383	0.117908	0.748897	0.197819	0.362599	0.617132	0.581283	1	0	quasar	quasar	null	1.513049	1.499433	1.52674	1	0.999066	1	false	null	243	true	true
19,275,813,399,552	true	true	AGN	0.423171	0.098453	0.505764	0.298302	-0.320331	0.392287	0.903925	0.99756	0	quasar	unclassified	STAR_EARLY	2.422632	2.384804	2.460883	1	0.969978	16	false	null	241	true	true
22,780,506,725,760	true	true	AGN	0.605762	0.026437	0.413799	0.360165	-0.555482	0.409713	0.840699	0.973736	0	quasar	unclassified	QSO_Z25_35	2.852854	2.842869	2.862864	1	0.99991	16	false	null	241	true	true
24,532,853,388,032	false	false	null	null	null	null	null	null	null	null	0.998706	0	quasar	unclassified	WD	1.719814	1.68939	1.750582	0.545775	0.92049	26	false	null	64	true	true
26,766,236,385,280	true	true	AGN	0.047675	null	null	null	null	null	null	0.977899	0.000038	quasar	unclassified	QSO_Z15_LT	0.932309	0.916736	0.948008	1	0.29004	20	false	null	81	true	true
29,102,698,617,216	true	true	null	null	null	null	null	null	null	null	0.98446	0.015539	quasar	unclassified	QSO_Z15_25	2.476653	2.449624	2.503893	0.569366	0.939342	26	false	null	67	true	true
30,202,210,258,432	true	true	null	null	null	null	null	null	null	null	0.424616	0	star	unclassified	QSO_Z05_15	2.4242	2.396871	2.451749	1	0.268085	20	false	null	1	false	true
31,026,843,960,576	true	true	AGN	0.473575	null	null	null	null	null	null	0.999996	0	quasar	unclassified	null	0.821638	0.802261	0.841224	0.61628	0.932736	27	false	null	83	true	true
31,301,721,872,256	false	false	null	null	null	null	null	null	null	null	0.963184	0	quasar	unclassified	QSO_Z05_15	2.341937	2.309777	2.37441	0.879257	0.908475	27	false	null	64	true	true
35,115,652,874,752	true	true	AGN	0.464591	0.052366	0.681788	0.44182	-0.473468	0.513366	0.9515	1	0	quasar	quasar	null	0.80348	0.793822	0.81319	1	0.999966	0	false	null	243	true	true
37,830,071,958,528	false	false	null	null	null	null	null	null	null	null	0.850095	0	quasar	unclassified	QSO_Z05_15	1.087847	1.072966	1.102835	0.917818	0.691027	29	false	null	64	true	true
40,445,707,528,448	false	false	null	null	null	null	null	null	null	null	0.014427	0.000136	star	unclassified	null	2.38987	2.358844	2.421182	1	0.927789	16	false	null	128	false	true
45,389,214,407,424	true	true	AGN	0.395261	0.105293	0.880855	0.452327	-0.218706	0.549379	0.907917	0.999947	0	quasar	unclassified	null	2.543476	2.529237	2.557773	1	0.996764	16	false	null	241	true	true
46,316,927,345,664	true	true	AGN	0.509151	null	null	null	null	null	null	0.970174	0.000001	quasar	unclassified	STAR_EARLY	1.024191	0.99873	1.049977	0.59184	0.95021	26	false	null	81	true	true
47,931,835,055,360	true	true	AGN	0.760351	0.137189	0.9684	0.292404	0.061239	0.72066	0.813919	0.999995	0	quasar	unclassified	null	1.036263	1.020973	1.051669	1	0.940988	17	false	null	115	true	true
50,714,973,862,784	true	true	AGN	0.288279	null	null	null	null	null	null	0.859034	0.000012	quasar	unclassified	QSO_Z05_15	2.251389	2.213255	2.289976	0.914629	0.97887	25	false	null	81	true	true
52,158,083,142,400	true	true	null	null	null	null	null	null	null	null	0.997844	0	quasar	unclassified	null	2.338985	2.322162	2.355893	1	0.996928	16	false	null	193	true	true
53,291,954,453,888	true	true	null	null	null	null	null	null	null	null	0.823754	0.000107	quasar	unclassified	null	2.424406	2.390775	2.458371	0.902692	0.751471	29	false	null	65	true	true
54,528,905,041,920	true	true	AGN	0.45468	0.025051	0.883627	0.216822	-0.48458	0.648646	0.744965	1	0	quasar	quasar	null	1.115134	1.097229	1.133192	0.76588	0.934711	11	false	null	243	true	true
54,838,142,692,736	true	true	null	null	null	null	null	null	null	null	0.997728	0	quasar	unclassified	WD	1.724683	1.710104	1.739341	1	0.862749	21	false	6	65	true	true
56,075,093,274,240	true	true	AGN	0.937059	0.137945	0.932722	0.374212	-0.354435	0.830018	0.889316	1	0	quasar	unclassified	null	2.411985	2.400413	2.423596	1	0.996976	16	false	null	243	true	true
56,453,050,406,784	true	true	AGN	0.317223	null	null	null	null	null	null	0.999956	0.000024	quasar	unclassified	null	2.501447	2.476009	2.52707	1	0.965437	16	false	null	209	true	true
56,659,208,841,728	false	false	null	null	null	null	null	null	null	null	0.064376	0	star	unclassified	QSO_Z05_15	1.401358	1.379714	1.423199	1	0.996055	16	false	null	128	false	true
57,208,964,633,216	true	true	null	null	null	null	null	null	null	null	0.148552	0.000015	star	unclassified	STAR_K	4.175214	4.162365	4.188096	1	0.99788	16	false	null	129	false	true
58,377,195,752,192	true	true	AGN	0.290615	0.075916	0.657564	0.291207	0.086661	0.431583	0.796833	0.989999	0.010001	quasar	quasar	GAL_Z01_LT	0.427567	0.421739	0.433418	1	0.999877	16	false	null	241	true	true
60,473,139,811,072	true	true	AGN	0.173746	0.024076	0.218147	0.123371	-0.770836	0.368674	0.66621	0.989054	0	quasar	unclassified	STAR_F	2.651393	2.631264	2.671634	1	0.923164	0	false	3	247	true	true
61,091,615,117,056	true	true	null	null	null	null	null	null	null	null	0.718318	0	quasar	unclassified	QSO_Z35_45	3.627567	3.596008	3.659342	0.672654	0.947466	26	false	null	65	true	true
63,909,113,668,736	true	true	null	null	null	null	null	null	null	null	0.976829	0.000008	quasar	unclassified	null	2.462935	2.448198	2.477735	1	0.877323	20	false	null	65	true	true
65,730,180,794,624	false	false	null	null	null	null	null	null	null	null	0.270207	0.000007	star	unclassified	null	3.328706	3.291112	3.366629	1	0.937835	16	false	null	128	false	true
66,245,575,874,560	true	true	null	null	null	null	null	null	null	null	0.000004	0.050956	star	unclassified	GAL_Z02_GT	null	null	null	null	null	null	false	null	1	false	false
70,471,823,469,568	false	false	null	null	null	null	null	null	null	null	0.011289	0	physicalbinary	unclassified	WD	2.388169	2.358087	2.41852	1	0.917609	17	false	null	64	false	true
70,952,859,808,640	false	false	null	null	null	null	null	null	null	null	0.999996	0.000002	quasar	unclassified	null	5.053583	4.990706	5.11712	0.640391	0.842785	31	false	null	64	true	true
77,756,088,174,464	true	true	AGN	0.505909	0.196683	0.970909	0.351133	0.161981	0.681453	0.738821	0.999986	0.000001	quasar	unclassified	null	1.294037	1.273474	1.314787	0.738002	0.789263	31	false	null	113	true	true
82,463,372,343,040	true	true	null	null	null	null	null	null	null	null	0.908475	0	quasar	unclassified	null	2.41334	2.35351	2.474238	0.624279	0.804332	30	false	null	65	true	true
83,116,207,389,824	true	true	AGN	0.811545	0.061436	0.975388	0.2637	0.198938	0.570373	0.380989	1	0	quasar	quasar	null	0.535215	0.533242	0.53719	1	1	0	false	null	243	true	true
84,456,237,175,680	true	true	AGN	0.283931	null	null	null	null	null	null	0.999997	0	quasar	unclassified	null	0.419532	0.406736	0.432443	1	0.972855	16	false	null	209	true	true
88,751,204,298,752	true	true	AGN	0.169018	null	null	null	null	null	null	1	0	quasar	quasar	null	2.781659	2.71875	2.845632	0.791118	0.810076	31	false	null	81	true	true
89,919,435,404,672	false	false	null	null	null	null	null	null	null	null	0.71712	0	quasar	unclassified	null	1.141153	1.128146	1.154239	0.755456	0.718717	30	false	null	64	true	true
91,018,947,429,120	true	true	AGN	0.118452	null	null	null	null	null	null	0.999933	0	quasar	unclassified	null	3.334723	3.304668	3.364989	1	0.957183	16	false	null	209	true	true
99,265,284,449,920	true	true	AGN	0.662481	0.06297	0.374211	0.150598	-0.425731	0.409218	0.906754	1	0	quasar	quasar	null	0.094802	0.085705	0.103976	0.512994	0.844225	30	false	null	113	true	true
100,605,314,265,600	true	true	AGN	0.39085	null	null	null	null	null	null	0.999399	0	quasar	unclassified	null	0.658682	0.633635	0.684114	0.785298	0.812726	31	false	null	81	true	true
105,896,713,928,960	true	true	AGN	0.238652	0.05109	0.398314	0.602786	-0.236372	0.280238	0.876327	1	0	quasar	unclassified	null	0.474082	0.469569	0.478608	1	1	16	false	3	247	true	true
108,336,255,385,600	true	true	AGN	0.501357	null	null	null	null	null	null	0.999962	0	quasar	unclassified	null	3.147938	3.112595	3.183586	0.838949	0.888223	31	false	null	83	true	true
110,058,537,753,856	true	true	null	null	null	null	null	null	null	null	0.001478	0.998522	galaxy	galaxy	GAL_Z01_02	null	null	null	null	null	null	false	null	1	false	false
112,669,877,896,960	true	true	null	null	null	null	null	null	null	null	0	0	star	unclassified	null	null	null	null	null	null	null	false	null	3	false	false
112,669,877,897,344	true	true	AGN	0.302131	0.119685	1.037375	0.448889	-0.121265	0.854276	0.866033	1	0	quasar	quasar	null	0.896084	0.881567	0.910713	1	0.995925	16	false	3	247	true	true
113,249,697,997,568	true	true	AGN	0.792185	null	null	null	null	null	null	1	0	quasar	unclassified	null	1.572823	1.551827	1.593992	0.747395	0.900325	26	false	null	81	true	true
114,005,612,268,544	true	true	AGN	0.053252	0.107691	0.616801	0.655869	0.089579	0.272765	0.809112	0.999995	0	quasar	unclassified	null	0.625422	0.600279	0.65096	0.886754	0.814705	31	false	null	113	true	true
114,868,901,117,440	true	true	null	null	null	null	null	null	null	null	0.963567	0.000001	quasar	unclassified	STAR_INT	1.017915	1.002683	1.033264	0.859163	0.991513	27	false	null	65	true	true
114,933,325,181,696	true	false	null	null	null	null	null	null	null	null	0.986274	0	quasar	unclassified	QSO_Z05_15	2.696699	2.667921	2.725702	1	0.947702	16	false	null	192	true	true
118,128,780,885,376	true	true	AGN	0.852856	0.300062	1.636134	0.402068	0.00274	1.526855	0.264688	1	0	quasar	quasar	null	0.653861	0.649629	0.658103	1	0.998283	1	false	6	243	true	true
119,468,810,676,480	false	false	null	null	null	null	null	null	null	null	0.7114	0.000056	quasar	unclassified	QSO_Z15_25	4.29299	4.231159	4.355552	0.943365	0.767313	29	false	null	64	true	true
119,713,624,419,840	true	true	AGN	0.039352	0.088879	0.393298	0.168844	0.156541	0.28535	0.551562	0.999067	0.000933	quasar	quasar	null	0.195558	0.193779	0.19734	1	0.999715	17	false	null	113	true	true
121,530,394,992,512	true	true	null	null	null	null	null	null	null	null	0.058419	0.002687	star	unclassified	QSO_Z15_25	3.061288	3.014319	3.108806	0.598745	0.859601	31	false	null	1	false	true
126,890,514,170,112	false	false	null	null	null	null	null	null	null	null	0.781069	0.025018	quasar	unclassified	null	0.967105	0.943822	0.990668	0.591314	0.954566	27	false	null	64	true	true
127,680,789,806,592	true	true	null	null	null	null	null	null	null	null	0.975185	0	quasar	unclassified	WD	0.487845	0.478087	0.497667	1	0.400285	20	false	null	65	true	true
127,921,306,309,632	true	true	AGN	0.126993	0.045667	0.685656	0.408724	-0.18096	0.257183	0.765695	0.832638	0.000061	quasar	unclassified	QSO_Z25_35	2.759619	2.678384	2.842649	0.317341	0.96203	26	false	null	113	true	true
130,670,085,408,896	true	true	AGN	0.738197	0.060549	0.861199	0.220746	-0.514521	0.714849	0.952476	0.999992	0	quasar	unclassified	null	1.877091	1.8661	1.888125	1	0.981614	0	false	null	243	true	true
137,305,810,244,608	true	true	AGN	0.332676	0.098163	0.622337	0.282085	-0.056152	0.692725	0.86366	0.349571	0.645299	galaxy	unclassified	QSO_Z15_25	0.259019	0.256399	0.261645	1	0.969568	17	true	5	117	false	true
137,335,874,670,848	false	false	null	null	null	null	null	null	null	null	0.973151	0	quasar	unclassified	STAR_A	0.649217	0.628249	0.670455	0.552428	0.829811	30	false	null	64	true	true
141,871,359,732,224	true	true	null	null	null	null	null	null	null	null	0.812906	0	quasar	unclassified	STAR_F	2.481976	2.449108	2.515156	0.893118	0.741377	31	false	null	65	true	true
147,987,393,177,728	true	true	null	null	null	null	null	null	null	null	0.034869	0.647417	galaxy	unclassified	QSO_Z15_25	0.749913	0.742712	0.757143	0.959238	0.760573	29	false	null	1	false	true
150,255,136,641,280	true	true	null	null	null	null	null	null	null	null	0.000052	0	star	unclassified	null	null	null	null	null	null	null	false	null	1	false	false
151,938,763,099,648	true	true	AGN	0.44266	null	null	null	null	null	null	0.999949	0	quasar	unclassified	null	1.134014	1.114651	1.153555	0.681106	0.748549	31	false	null	81	true	true
153,381,872,120,704	true	true	null	null	null	null	null	null	null	null	0.071492	0.000014	star	unclassified	QSO_Z15_25	2.401351	2.381245	2.421577	1	0.968683	16	false	null	129	false	true
165,751,378,180,480	true	true	AGN	0.811541	0.057235	0.498169	0.447021	-0.304112	0.480201	0.844758	0.993366	0.000001	quasar	unclassified	QSO_Z05_15	1.543616	1.522082	1.565334	0.98732	0.902924	25	false	null	113	true	true
166,301,133,994,240	true	true	AGN	0.078081	0.055617	0.608285	0.263198	-0.168184	0.258416	0.819507	0.995217	0.000003	quasar	unclassified	QSO_Z05_15	2.409512	2.392251	2.42686	1	0.89884	21	false	null	113	true	true
169,359,150,479,232	true	true	AGN	0.144498	null	null	null	null	null	null	1	0	quasar	quasar	null	1.583027	1.566807	1.59935	0.972266	0.998085	25	false	null	81	true	true
170,493,021,854,592	true	true	null	null	null	null	null	null	null	null	0.083583	0	star	unclassified	null	4.923561	4.846018	5.002132	0.764127	0.911724	26	false	null	1	false	true
171,867,411,616,768	true	true	null	null	null	null	null	null	null	null	0.696995	0.00002	quasar	unclassified	STAR_INT	2.625586	2.603241	2.64807	1	0.97979	16	false	null	193	true	true
174,100,794,902,400	true	true	AGN	0.276939	null	null	null	null	null	null	0.992212	0.000014	quasar	unclassified	QSO_Z25_35	3.432099	3.395815	3.468682	0.936772	0.872684	29	false	null	81	true	true
174,410,032,278,400	true	true	null	null	null	null	null	null	null	null	0.377805	0.000002	star	unclassified	QSO_Z15_25	0.383125	0.367044	0.399396	1	0.802282	21	false	null	1	false	true
175,032,802,459,520	true	true	null	null	null	null	null	null	null	null	0.36063	0	star	unclassified	QSO_Z05_15	1.398835	1.361416	1.436847	0.758713	0.880679	31	false	null	1	false	true
179,495,273,309,184	true	true	null	null	null	null	null	null	null	null	0.633476	0	quasar	unclassified	null	0.946877	0.931469	0.962409	1	0.761715	21	false	null	65	true	true
181,316,339,447,936	true	true	AGN	0.829773	null	null	null	null	null	null	1	0	quasar	unclassified	null	1.848892	1.835739	1.862106	1	0.922811	0	false	null	209	true	true
183,068,686,111,232	true	true	null	null	null	null	null	null	null	null	0.999918	0	quasar	unclassified	null	2.602792	2.571552	2.634306	0.770855	0.562784	30	false	null	65	true	true
183,068,686,111,872	false	false	null	null	null	null	null	null	null	null	0.870395	0.000003	quasar	unclassified	QSO_Z05_15	4.508218	4.424441	4.593289	1	0.587633	21	false	null	64	true	true
188,531,884,658,304	true	true	AGN	0.24547	0.065169	0.772867	0.384165	-0.515311	0.415025	0.850241	0.999959	0.000041	quasar	quasar	null	1.388016	1.357828	1.418591	1	0.882794	21	false	null	113	true	true
189,734,475,497,856	true	true	AGN	0.53066	null	null	null	null	null	null	0.96649	0.02792	quasar	unclassified	QSO_Z15_25	6.013818	5.964574	6.06341	1	0.896824	21	false	null	81	true	true
190,009,353,405,440	true	true	AGN	0.223103	0.07619	0.655604	0.241555	-0.221279	0.509885	0.960698	1	0	quasar	quasar	null	4.4749	4.388681	4.562499	1	0.385042	20	false	null	113	true	true
191,761,700,067,584	false	false	null	null	null	null	null	null	null	null	0.998137	0	quasar	unclassified	WD	2.34013	2.300015	2.380733	1	0.697814	20	false	null	64	true	true
194,132,521,868,032	true	true	AGN	0.290999	null	null	null	null	null	null	0.475961	0.000007	star	unclassified	null	3.466702	3.451388	3.482068	1	0.924515	16	false	null	145	false	true
194,957,155,591,168	false	false	null	null	null	null	null	null	null	null	0.019601	0.000012	star	unclassified	QSO_Z05_15	2.624385	2.593873	2.655155	1	0.987608	16	false	null	128	false	true
195,786,084,848,768	false	false	null	null	null	null	null	null	null	null	0.999998	0	quasar	unclassified	null	2.566577	2.535108	2.598326	0.879342	0.903194	27	false	null	64	true	true
196,846,941,209,856	true	true	AGN	0.855448	null	null	null	null	null	null	0.999996	0	quasar	unclassified	null	1.631539	1.614007	1.649188	1	0.998448	17	false	null	81	true	true
196,984,380,167,424	true	true	AGN	0.511552	null	null	null	null	null	null	0.999964	0.000036	quasar	quasar	null	4.29092	4.227815	4.354787	0.396169	0.888862	30	false	null	83	true	true
199,286,482,883,072	false	false	null	null	null	null	null	null	null	null	0.54437	0	quasar	unclassified	WD	0.879278	0.858272	0.900521	0.932529	0.897231	29	false	null	64	true	true
199,286,482,883,840	false	false	null	null	null	null	null	null	null	null	0.042641	0.945401	galaxy	unclassified	null	0.858782	0.83842	0.879371	1	0.922621	16	false	null	192	false	true
202,585,017,523,456	true	true	null	null	null	null	null	null	null	null	0.965267	0	quasar	unclassified	QSO_Z05_15	2.479085	2.445055	2.513451	1	0.960008	16	false	null	193	true	true
203,894,983,246,848	true	false	AGN	0.610091	0.048222	0.969833	0.448869	-0.369274	0.558958	0.823455	0.999984	0	quasar	unclassified	null	2.902549	2.874952	2.930343	1	0.881786	21	false	null	112	true	true
205,746,113,591,040	true	true	AGN	0.90526	0.164934	1.237777	0.360594	-0.435093	1.208913	0.671837	1	0	quasar	quasar	null	4.642244	4.604736	4.680004	0.987121	0.900435	25	false	null	115	true	true
207,017,423,782,912	false	false	null	null	null	null	null	null	null	null	0.999999	0	quasar	unclassified	null	2.604897	2.563332	2.646946	1	0.798951	20	false	null	64	true	true
207,807,698,033,408	false	false	null	null	null	null	null	null	null	null	0.036603	0.000199	star	unclassified	null	2.576029	2.542851	2.609518	1	0.965059	16	false	null	128	false	true
208,082,575,944,192	false	false	null	null	null	null	null	null	null	null	0.787217	0.000006	quasar	unclassified	WD	0.761976	0.743157	0.780998	1	0.954173	17	false	null	64	true	true

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Gaia DR3 QSO Candidates

Credit: NASA/ESA/Hubble

Part of a dataset collection on Hugging Face.

Dataset description

The Gaia DR3 QSO Candidates catalog contains 6.6 million quasi-stellar object (QSO) and active galactic nuclei (AGN) candidates identified by the ESA Gaia mission. This is the largest QSO candidate catalog ever compiled, covering the full sky down to G~21 mag.

Candidates were selected using a combination of four independent methods: astrometric (proper motion and parallax consistent with zero, as expected for point sources at cosmological distances), photometric variability (structure function analysis, fractional variability), the Discrete Source Classifier (DSC) which assigns quasar/galaxy/star probabilities using spectrophotometric and low-resolution spectra data, and host galaxy morphology fitting. The primary selection probability is classprob_dsc_combmod_quasar.

For a subset of sources, photometric redshifts (up to z~6) are available via the QSOC (QSO Spectra Cross-Correlation) method. Host galaxy morphology parameters (Sérsic profile index, effective radius, ellipticity) are provided for sources where an extended component was detected. The most astrometrically stable QSO candidates (gaia_crf_source=True) anchor the Gaia Celestial Reference Frame (GCRF3) to the International Celestial Reference Frame (ICRF).

This catalog enables studies of AGN demographics across cosmic time, the large-scale distribution of quasars as tracers of cosmic structure, host galaxy properties of AGN at low and moderate redshift, and photometric redshift estimation for the high-redshift universe. When cross-matched with radio, X-ray, or infrared surveys, the Gaia astrometry provides sub-milliarcsecond positions for millions of AGN.

This dataset is suitable for tabular classification, tabular regression tasks.

Schema

Column	Type	Description	Sample	Null %
`source_id`	int64	Gaia DR3 unique source identifier; use for cross-matching with other Gaia tables	3470333738112	0.0%
`astrometric_selection_flag`	boolean	Boolean: selected via astrometric criteria (proper motion and parallax consistent with zero, as expected for extragalactic sources)	True	0.0%
`gaia_crf_source`	boolean	Boolean: source used to define the Gaia Celestial Reference Frame (GCRF3); these are the most astrometrically stable QSO candidates	True	0.0%
`vari_best_class_name`	str	Best variability classification name from Gaia's variability pipeline (e.g. 'QSO', 'AGN')	AGN	83.1%
`vari_best_class_score`	float64	Score/probability of the best variability classification (0-1); higher values indicate more confident classification	0.11882647	83.1%
`fractional_variability_g`	float64	Fractional variability in G-band: excess variance relative to photometric noise; QSOs typically show ~0.05-0.3	0.043430813	86.9%
`structure_function_index`	float64	Power-law index of the structure function; QSOs typically have ~0.3, indicating damped random walk variability	1.151587	86.9%
`structure_function_index_scatter`	float64	Uncertainty on the structure function power-law index	0.3209494311719197	86.9%
`qso_variability`	float64	Variability-based QSO probability score from the variability module	-0.5991405	86.9%
`non_qso_variability`	float64	Non-QSO variability score; high values suggest the source may be a star or other variable type rather than a QSO	0.93071073	86.9%
`vari_agn_membership_score`	float64	AGN membership score from the Gaia variability module; combines multiple variability criteria	0.775406560175083	86.9%
`classprob_dsc_combmod_quasar`	float64	DSC (Discrete Source Classifier) combined-module quasar probability (0-1); primary classifier output for QSO selection	0.21880803	0.0%
`classprob_dsc_combmod_galaxy`	float64	DSC combined-module galaxy probability (0-1); sources with high galaxy probability may be extended sources	1.0781841e-05	0.0%
`classlabel_dsc`	str	DSC class label assigned by the Discrete Source Classifier (quasar, galaxy, star, whitedwarf, physicalbinary)	star	0.0%
`classlabel_dsc_joint`	str	Joint DSC class label combining spectrophotometric and spectra modules	unclassified	0.0%
`classlabel_oa`	str	Online Anomaly Detector class label; identifies photometrically anomalous sources	QSO_Z05_15	57.8%
`redshift_qsoc`	float64	Photometric redshift estimate from QSO spectra cross-correlation (QSOC method); valid range ~0 to 6	2.9820654	4.1%
`redshift_qsoc_lower`	float64	Lower 1-sigma uncertainty on the photometric redshift estimate	2.9402733	4.1%
`redshift_qsoc_upper`	float64	Upper 1-sigma uncertainty on the photometric redshift estimate	3.0243008	4.1%
`ccfratio_qsoc`	float64	Cross-correlation function ratio used in the QSOC redshift estimation; quality indicator for the redshift solution	1.0	4.1%
`zscore_qsoc`	float64	Z-score of the redshift solution; measures significance of the cross-correlation peak	0.39714646	4.1%
`flags_qsoc`	Int32	Quality flags for the QSOC redshift estimate; bitmask encoding reliability of the photometric redshift	21	4.1%
`n_transits`	Int32	Number of Gaia photometric transits used in the variability and morphology analysis	0	0.0%
`host_galaxy_detected`	boolean	Boolean: host galaxy morphology was successfully fitted with a Sérsic profile	False	0.0%
`host_galaxy_flag`	Int32	Quality flag for the host galaxy morphology fit; encodes fit convergence and reliability	6	83.7%
`source_selection_flags`	Int32	Bitmask of selection criteria met by this QSO candidate (astrometric, variability, spectral, morphology modules)	1	0.0%
`high_confidence_qso`	boolean	Derived boolean: classprob_dsc_combmod_quasar > 0.5 — high-confidence quasar classification from DSC	False	0.0%
`has_redshift`	bool	Derived boolean: photometric redshift estimate is available (redshift_qsoc is not null)	True	0.0%

Quick stats

6,649,162 total QSO/AGN candidates
5,243,012 high-confidence QSOs (classprob_dsc_combmod_quasar > 0.5)
6,375,063 sources with photometric redshift estimate
Median photometric redshift (where available): 1.667
1,614,173 Gaia Celestial Reference Frame sources

Usage

from datasets import load_dataset

ds = load_dataset("juliensimon/gaia-dr3-qso-candidates", split="train")
df = ds.to_pandas()

from datasets import load_dataset

ds = load_dataset("juliensimon/gaia-dr3-qso-candidates", split="train")
df = ds.to_pandas()

# High-confidence QSO candidates
high_conf = df[df["high_confidence_qso"]]
print(f"High-confidence QSOs: {len(high_conf):,}")

# Redshift distribution for high-confidence QSOs
import matplotlib.pyplot as plt
z_df = high_conf.dropna(subset=["redshift_qsoc"])
z_df["redshift_qsoc"].hist(bins=100)
plt.xlabel("Photometric redshift")
plt.ylabel("Count")
plt.title("Gaia DR3 QSO Candidate Redshift Distribution")
plt.show()

# DSC quasar probability vs fractional variability
import matplotlib.pyplot as plt
sample = df.dropna(subset=["classprob_dsc_combmod_quasar", "fractional_variability_g"]).sample(50000)
plt.hexbin(sample["classprob_dsc_combmod_quasar"], sample["fractional_variability_g"],
           gridsize=100, mincnt=1, cmap="viridis")
plt.colorbar(label="Count")
plt.xlabel("DSC Quasar Probability")
plt.ylabel("Fractional Variability (G-band)")
plt.title("QSO Classification vs Variability")
plt.show()

# DSC class label distribution
print(df["classlabel_dsc"].value_counts())

# Gaia CRF sources (most stable astrometric reference QSOs)
crf = df[df["gaia_crf_source"] == True]
print(f"Gaia CRF anchor sources: {len(crf):,}")

Data source

https://gea.esac.esa.int/archive/

Related datasets

If you find this dataset useful, please consider giving it a like on Hugging Face. It helps others discover it.

About the author

Created by Julien Simon — AI Operating Partner at Fortino Capital. Part of the Space Datasets collection.

Citation

@dataset{gaia_dr3_qso_candidates,
  title = {Gaia DR3 QSO Candidates},
  author = {juliensimon},
  year = {2026},
  url = {https://huggingface.co/datasets/juliensimon/gaia-dr3-qso-candidates},
  publisher = {Hugging Face}
}