Datasets:

juliensimon
/

veron-agn-quasar-catalog

object_class large_stringclasses 3 values	radio_flag large_stringclasses 1 value	name large_stringlengths 3 17 ⌀	position_origin large_stringclasses 3 values	ra float64 0 360	dec float64 -86.63 88.2	flux_20cm_mjy float64 0 57.3 ⌀	flux_20cm_reference float64 4 2.62k ⌀	redshift float64 0 6.43 ⌀	spectral_classification large_stringclasses 27 values	magnitude_band large_stringclasses 6 values	apparent_magnitude float64 0 27.4 ⌀	color_bv float64 -1.36 4.06 ⌀	color_ub float64 -3.76 4.57 ⌀	absolute_magnitude float64 -31.5 -7.8 ⌀	finding_chart_reference float64 5 2.7k ⌀	magnitude_reference float64 3 2.7k ⌀	redshift_reference float64 1 2.7k ⌀
Q	*	SDSS J03003+0009	O	45.075417	0.1525	null	2,068	2.23	null	null	20.45	0.28	-0.18	-24.4	null	2,068	2,068
Q	*	Q 0258+0005	O	45.188333	0.2825	null	null	1.727	null	null	19	0.26	-0.64	-25.4	529	3	529
A	*	SDSS J03013+0017	O	45.339167	0.290278	null	2,068	0.41	null	null	20.25	0.48	-0.51	-20.7	null	2,068	2,068
Q	*	Q 0258+0009	O	45.189583	0.359167	null	null	1.497	null	null	19.63	0.27	-0.67	-24.5	529	3	529
Q	*	SDSS J02596+0018	O	44.916667	0.310556	null	2,068	1.849	null	null	20.44	0.12	-0.65	-24.2	null	2,068	2,068
Q	*	SDSS J02591+0018A	O	44.799167	0.303333	null	null	2.862	null	null	19.12	0.22	0.11	-26.8	null	1,001	1,001
A	*	SDSS J02598+0023	O	44.96375	0.383611	null	null	0.505	S2	null	21.31	null	null	-20.5	null	null	2,664
Q	*	SDSS J03003+0026	O	45.079167	0.439722	null	2,068	1.535	null	null	19.77	0.22	-0.69	-24.4	null	2,068	2,068
Q	*	Q 0257+0023B	O	44.99125	0.581667	null	null	0.82	null	*	19.32	0.2	-0.5	-23.6	529	1,301	529
Q	null	RD J030117+002025	O	45.32125	0.340556	0	1,797	5.5	null	I	23.8	null	null	-22.7	2,214	null	2,214
Q	*	SDSS J03024+0037	O	45.615417	0.631111	null	2,068	1.045	null	null	19.3	0.34	-0.68	-24	null	2,068	2,068
Q	*	SDSS J03022+0037	O	45.552083	0.625833	null	2,068	1.934	null	null	20.26	0.18	-0.87	-24.5	null	2,068	2,068
Q	*	SDSS J03019+0041	O	45.475	0.6925	null	2,068	2.32	null	null	19.5	0.23	-0.44	-25.7	null	2,068	2,068
Q	*	Q 0258+0020	O	45.174167	0.543889	null	null	1.112	null	null	19.21	0.26	-0.69	-24.3	529	3	529
Q	*	SDSS J03006+0033	O	45.174167	0.563056	null	2,068	1.738	null	null	19.42	0.17	-0.56	-25.1	null	2,068	2,068
Q	*	SDSS J03008+0033	O	45.214167	0.564444	null	2,068	2.407	null	null	19.55	0.28	-0.35	-25.7	null	2,068	2,068
Q	null	SDSSp J03004+0032	O	45.105	0.539722	0.008	2,530	4.19	null	null	21.17	1.35	-0.35	-25.8	724	3	724
A	*	PB 6966	O	45.05	0.591111	null	null	0.42	S	null	19.41	0.13	-0.54	-21.9	529	3	529
Q	*	SDSS J03005+0038A	O	45.131667	0.642222	null	null	2.633	null	null	18.39	0.32	-0.37	-27.1	null	1,001	1,001
Q	*	SDSS J03015+0048	O	45.385417	0.805833	null	2,068	1.536	null	null	20.8	0.41	-0.71	-23.2	null	2,068	2,068
Q	*	SDSS J02588+0031	O	44.71875	0.528611	null	2,068	1.458	null	null	20.58	0.3	-0.75	-23.5	null	2,068	2,068
Q	null	US 3472	O	44.90625	0.626667	0.001	2,530	0.532	null	null	16.72	0.07	-0.55	-25.2	1,063	3	1,586
A	*	SDSS J02581+0032	O	44.536667	0.536944	null	2,068	0.663	null	null	20.21	0.17	-0.39	-22.1	null	2,068	2,068
A	*	SDSS J02574+0038	O	44.353333	0.6425	null	null	0.137	S2	null	19.16	0.72	0.5	-19	null	3	951
A	*	SDSS J02583+0040	O	44.577917	0.678611	null	null	0.171	S2	null	19.61	0.91	0.82	-18.9	null	3	951
Q	*	Q 0256+0030	O	44.72875	0.706111	null	null	1.569	null	null	20.38	0.34	-0.57	-23.8	null	3	1,301
A	*	SDSS J02588+0043	O	44.714167	0.719722	null	null	0.09	S2	null	19.2	0.89	0.64	-17.9	null	3	951
Q	*	SDSS J02589+0045	O	44.7375	0.753889	null	2,068	1.303	null	null	20.54	0.45	-0.8	-23.1	null	2,068	2,068
A	*	SDSS J02582+0046	O	44.55625	0.776944	null	null	0.09	S2	null	19.19	0.73	0.35	-18.1	null	3	951
A	*	SDSS J02598+0037	O	44.96375	0.629167	null	2,068	0.471	null	null	19.36	0.17	-0.63	-22.2	null	2,068	2,068
Q	*	Q 0257+0031	O	45.14125	0.723611	null	null	0.806	null	null	19.77	0.24	-0.54	-23.1	529	3	529
A	*	S 0257+0030	O	44.909167	0.704444	null	null	0.197	S	null	18.48	0.66	-0.38	-20.6	529	3	529
Q	*	SDSS J02599+0048	O	44.99875	0.803889	null	null	0.892	null	null	19.65	0.33	-0.58	-23.4	null	3	3
Q	*	SDSS J03000+0048	O	45.002083	0.807778	null	null	0.892	null	null	18.29	1.89	-0.45	-23.2	null	3	936
Q	*	US 3513	O	45.20375	0.911389	null	null	0.661	null	null	18.77	0.13	-0.47	-23.6	1,063	3	529
A	*	S 0257+0042	O	45.130417	0.899444	null	null	0.198	S1n	null	19.28	0.32	-0.56	-20.2	529	3	2,542
Q	*	SDSS J02588+0052	O	44.71375	0.875556	null	2,068	1.041	null	null	20.41	0.45	-0.54	-22.8	null	2,068	2,068
A	*	Q 0256+0043	O	44.795	0.917778	null	null	0.199	null	null	19.56	0.45	-0.54	-19.8	null	3	1,301
Q	*	US 3461	O	44.844167	0.974722	null	null	1.853	null	null	18.91	0.13	-0.67	-25.8	1,063	3	529
A	*	S 0257+0051	O	44.96125	1.051111	null	null	0.257	S1	null	19.06	0.43	-0.43	-20.9	529	3	529
B	null	SDSS J03026+0038	O	45.667917	0.646944	0.002	2,530	null	BL	null	20.22	0.41	-0.6	null	null	462	462
A	*	SDSS J03029+0048	O	45.742083	0.806667	null	null	0.303	S1	null	19.36	0.44	-0.75	-21	null	873	873
Q	*	SDSS J03039+0051	O	45.98	0.861667	null	2,068	1.601	null	null	20.75	0.3	-0.66	-23.4	null	2,068	2,068
Q	*	SDSS J03021+0058	O	45.54625	0.966667	null	2,068	2.128	null	null	20.39	0.24	-0.82	-24.5	null	2,068	2,068
Q	*	SDSS J03018+0057	O	45.4575	0.965556	null	2,068	2.408	null	null	19.57	0.29	-0.21	-25.6	null	2,068	2,068
Q	*	US 3595	O	46.01875	1.0575	null	null	1.833	null	null	18.93	0.22	-0.73	-25.6	1,063	3	3
Q	*	SDSS J03043+0105	O	46.09375	1.088333	null	2,068	1.443	null	null	20.56	0.33	-0.44	-23.5	null	2,068	2,068
A	*	SDSS J03050+0113	O	46.267083	1.223333	null	2,068	0.613	null	null	19.94	0.28	-0.25	-22.1	null	2,068	2,068
A	*	SDSS J03046+0110	O	46.172083	1.181111	null	null	0.299	S1	null	19.53	0.63	-0.15	-20.6	null	873	873
Q	*	SDSS J03046+0111	O	46.156667	1.189167	null	2,068	0.665	null	null	19.98	0.21	-0.49	-22.3	null	2,068	2,068
Q	*	SDSS J03036+0105	O	45.916667	1.099167	null	2,068	3.47	null	null	20.13	0.71	0.93	-26.2	null	2,068	2,068
A	*	SDSS J03034+0109	O	45.874583	1.158611	null	null	0.127	S2	null	19.05	0.84	0.45	-18.9	null	3	951
Q	*	SDSS J03036+0110	O	45.924583	1.174444	null	2,068	1.637	null	null	19.41	0.17	-0.54	-25	null	2,068	2,068
Q	null	SDSS J03038+0112	O	45.955833	1.201667	0.003	2,530	0.663	null	null	19.87	0.25	-0.62	-22.4	null	3	3
Q	*	SDSS J03041+0113	O	46.030417	1.221111	null	2,068	1.251	null	null	19.61	0.34	-0.75	-24.1	null	2,068	2,068
Q	*	SDSS J03014+0058	O	45.3675	0.9675	null	2,068	1.778	null	null	19.82	0.28	-0.4	-24.6	null	2,068	2,068
A	*	SDSS J03014+0110	O	45.350833	1.172778	null	null	0.072	S1	null	17.72	0.46	-0.4	-19.3	null	3	3
Q	*	SDSS J03019+0109	O	45.494167	1.151111	null	2,068	1.04	null	null	19.57	0.56	-0.31	-23.5	null	2,068	2,068
Q	*	SDSS J03016+0112	O	45.4075	1.213333	null	2,068	1.18	null	null	19.65	0.31	-0.72	-23.9	null	2,068	2,068
A	*	RXS J03017+0115	O	45.434167	1.258611	null	null	0.084	null	null	17.49	0.41	-0.38	-19.9	null	3	2,651
Q	null	Q 0259+0104	O	45.420833	1.263889	0.003	2,530	1.77	null	*	19.53	0.11	-0.99	-25.1	529	1,301	529
Q	null	PKS 0258+011	O	45.348333	1.309722	0.47	2,530	1.221	null	null	20.5	null	null	-23.5	2,013	null	1,049
Q	*	Q 0259+0112	O	45.406667	1.412222	null	null	2.316	null	*	19.22	-0.09	-0.43	-26.3	529	1,301	529
A	*	SDSS J02578+0045	O	44.451667	0.756667	null	1,889	0.544	S2	null	21.89	0.82	-0.19	-19.3	null	1,889	1,889
Q	*	SDSS J02575+0048	O	44.397917	0.801667	null	2,068	1.191	null	null	20.59	0.43	-0.89	-22.9	null	2,068	2,068
Q	*	SDSS J02570+0043	O	44.260833	0.719167	null	2,068	1.087	null	null	20.2	0.37	-0.58	-23.2	null	2,068	2,068
A	*	SDSS J02578+0053	O	44.4675	0.886389	null	2,068	0.41	null	null	19.99	0.32	-0.69	-21.1	null	2,068	2,068
Q	*	SDSS J02584+0053	O	44.620833	0.883333	null	2,068	0.848	null	null	20.3	0.3	-0.65	-22.6	null	2,068	2,068
Q	null	Q 0254+0042	O	44.24375	0.913056	0.011	483	1.115	null	null	19.39	0.29	-0.62	-24.1	529	3	529
Q	*	SDSS J02568+0056	O	44.218333	0.937222	null	null	1.188	null	null	20.31	0.33	-0.69	-23.3	null	3	3
Q	*	SDSS J02560+0050	O	44.020417	0.836944	null	2,068	0.919	null	null	20.5	0.32	-0.78	-22.5	null	2,068	2,068
Q	*	US 3363	O	43.999167	0.886389	null	null	0.847	null	null	18.78	0.16	-0.49	-24.3	1,063	3	529
A	*	Q 0253+0040	O	44.010417	0.882222	null	null	0.531	null	*	19.28	0.59	0.09	-22.1	null	1,301	1,301
Q	null	SDSS J02570+0106	O	44.258333	1.112222	0.007	2,530	2.192	null	null	20.81	0.43	-0.47	-23.9	null	3	3
Q	*	SDSS J02589+0101	O	44.725833	1.026667	null	2,068	1.258	null	null	20.01	0.32	-0.82	-23.7	null	2,068	2,068
Q	*	SDSS J02584+0101	O	44.613333	1.0175	null	2,068	2.335	null	null	19.71	0.24	-0.21	-25.5	null	2,068	2,068
Q	*	SDSS J02580+0103	O	44.510833	1.065278	null	2,068	2.135	null	null	20.62	0.17	-0.71	-24.3	null	2,068	2,068
Q	*	SDSS J02582+0106	O	44.55375	1.100833	null	2,068	2.239	null	null	19.49	0.39	-0.24	-25.3	null	2,068	2,068
Q	*	SDSS J02581+0106	O	44.541667	1.106944	null	2,068	0.805	null	null	20.63	0.26	-0.62	-22.2	null	2,068	2,068
Q	*	SDSS J02577+0111	O	44.432083	1.195556	null	null	1.714	null	null	19.26	0.39	-0.56	-25	null	3	3
Q	*	SDSS J02576+0110	O	44.405417	1.176389	null	2,068	1.465	null	null	20.45	0.46	-0.62	-23.5	null	2,068	2,068
Q	*	SDSS J02558+0058	O	43.965833	0.973333	null	2,068	0.638	null	null	19.64	0.21	-0.37	-22.5	null	2,068	2,068
Q	*	SDSS J02560+0102	O	44.000417	1.049444	null	2,068	1.391	null	null	21.12	0.48	-0.84	-22.7	null	2,068	2,068
Q	*	SDSS J02561+0104	O	44.029583	1.076944	null	2,068	2.092	null	null	20.41	0.36	-0.58	-24.3	null	2,068	2,068
Q	*	SDSS J02553+0100	O	43.828333	1.010278	null	2,068	1.137	null	null	20.11	0.39	-0.73	-23.3	null	2,068	2,068
A	*	S 0254+0101	O	44.195417	1.23	null	null	0.177	S1	null	17.99	0.54	-0.59	-21	529	3	400
Q	*	Q 0253+0058	O	44.03	1.1775	null	null	1.347	null	null	19.11	0.47	-0.69	-24.6	529	3	529
Q	*	SDSS J02561+0112	O	44.046667	1.209444	null	2,068	1.865	null	null	20.75	0.29	-0.55	-23.8	null	2,068	2,068
Q	*	SDSS J02552+0111	O	43.82	1.192778	null	null	2.839	null	null	19.63	0.45	0.43	-26	null	3	3
Q	*	SDSS J02574+0115	O	44.351667	1.258333	null	null	2.258	null	null	19.58	0.41	-0.56	-25.2	null	3	3
Q	*	Q 0254+0113	O	44.315417	1.4275	null	null	1.089	null	*	19.24	0.27	-0.5	-24.2	529	1,301	529
Q	*	Q 0254+0126	O	44.254583	1.637222	null	null	1.793	null	*	19.42	0.16	-0.69	-25.1	529	1,301	529
Q	*	US 3493	O	45.075417	1.4775	null	null	1.356	null	*	18.79	-0.14	-0.71	-25.6	1,063	1,301	529
Q	null	US 3532	O	45.409167	1.638056	0.007	483	1.578	null	*	19.02	0.08	-0.57	-25.4	1,063	1,301	529
Q	*	US 3540	O	45.51125	1.771667	null	null	1.734	null	*	18.74	-0.12	-1.07	-26	1,063	1,301	144
A	*	US 3533	O	45.41375	1.750278	null	null	0.184	S1	*	18.54	0.32	-0.46	-20.7	1,063	1,301	144
Q	*	US 3514	O	45.207917	1.815556	null	null	1.302	null	*	19.95	-0.05	-1.15	-24.2	1,063	1,301	529
Q	*	US 3523	O	45.254167	1.825	null	null	0.595	null	*	19	0.2	-0.73	-23	1,063	1,301	529
Q	*	US 3529	O	45.374167	1.961389	null	null	1.349	null	*	19.25	0.6	-0.65	-24.3	1,063	1,301	1,301
A	*	US 3430	O	44.4825	1.743333	null	null	0.282	S1	*	18.48	0.4	-0.5	-21.7	529	1,301	529

End of preview. Expand in Data Studio

Veron-Cetty AGN/Quasar Catalog (13th edition)

Artist concept of a supermassive black hole with a relativistic jet — AGN engine

Credit: NASA/JPL-Caltech

Part of a dataset collection on Hugging Face.

Dataset description

The Veron-Cetty & Veron Quasars and Active Nuclei catalog, 13th edition (VizieR VII/258) — the canonical reference compilation of 168,940 quasars and active galactic nuclei published through 2010, covering optical/UV-selected quasars, X-ray-selected AGN, radio galaxies, and BL Lac objects.

The catalog merges every published QSO and AGN identification with a homogeneous position, spectroscopic redshift, optical photometry, B-V and U-B colors, absolute magnitude, and (where available) radio fluxes at 6 cm and 20 cm. It remains the standard look-up source for cross-matching unidentified sources against the established AGN population, for selecting training/test samples by spectral subclass (Seyfert 1, Seyfert 2, LINER, BL Lac), and for population statistics in redshift, luminosity, and color spaces.

Object class column conventions: 'Q' marks quasars (M_V <= -23, brighter than the historical QSO/AGN boundary), 'A' marks lower-luminosity AGN (M_V > -23), and 'B' marks BL Lac objects. The spectral classification column captures Seyfert sub-type and special spectral phenomena. Use this dataset alongside juliensimon/milliquas (the more recent Million Quasars Catalog that supersedes Veron for survey-era discoveries), juliensimon/gaia-dr3-qso-candidates (Gaia-selected QSOs), juliensimon/black-hole-catalog, juliensimon/4xmm-dr14-xray-sources, and juliensimon/icrf3-reference-frame for AGN cross-mission analysis.

This dataset is suitable for tabular classification tasks.

Schema

Column	Type	Description	Sample	Null %
`object_class`	str	Object classification: 'Q' = quasar (M_abs <= -23, brighter than -23), 'A' = AGN (M_abs > -23, fainter), 'B' = BL Lac object	Q	0.0%
`radio_flag`	str	Radio-detection flag: '*' = detected at radio frequencies, blank = not detected (or no radio coverage)	*	11.3%
`name`	str	Primary designation (catalog and survey ID), typically 'SDSS Jhhmm+ddmm', '4C+nn.nn', 'PG hhmm+ddd', etc.	SDSS J03003+0009	0.0%
`position_origin`	str	Origin code for the J2000 coordinates: 'O' = optical position, 'R' = radio position, 'X' = X-ray, etc.	O	2.5%
`ra`	float64	Right ascension (degrees, J2000)	45.07541666666666	0.0%
`dec`	float64	Declination (degrees, J2000)	0.1524999999999999	0.0%
`flux_20cm_mjy`	float64	Radio flux density at 20 cm (1.4 GHz) in mJy where detected	0.0	89.2%
`flux_20cm_reference`	float64	Bibliographic reference code for the 20 cm flux measurement	2068.0	64.6%
`redshift`	float64	Spectroscopic or photometric redshift z (dimensionless); range ~0 to ~7 in this compilation	2.23	0.4%
`spectral_classification`	str	Spectral subclass code: 'S1' = Seyfert 1, 'S2' = Seyfert 2, 'S1.5'/'S1.9' = intermediate types, 'NLAGN' = narrow-line AGN, 'HP' = high polarization, 'LINER' = LINER, blank = standard QSO	S2	82.7%
`magnitude_band`	str	Photometric system letter for the magnitude: 'V' = Johnson V, 'B' = blue, 'R' = red, 'g' = SDSS g, etc.	*	81.4%
`apparent_magnitude`	float64	Apparent magnitude in the band identified by magnitude_band; brighter sources have smaller values	20.45	0.4%
`color_bv`	float64	Johnson B-V color index (mag); positive values indicate redder colors	0.28	22.1%
`color_ub`	float64	Johnson U-B color index (mag); the 'UV excess' (negative U-B) is the historical AGN selection signature	-0.18	9.7%
`absolute_magnitude`	float64	Absolute V magnitude M_V (mag); the Q/A class boundary is M_V = -23. Computed assuming H_0 = 71, Omega_M = 0.27, Omega_lambda = 0.73	-24.4	0.7%
`finding_chart_reference`	float64	Bibliographic reference code for a published finding chart of the source	529.0	93.5%
`magnitude_reference`	float64	Bibliographic reference code for the magnitude measurement	2068.0	9.1%
`redshift_reference`	float64	Bibliographic reference code for the redshift	2068.0	0.0%

Quick stats

168,940 quasars + AGN + BL Lac objects in the canonical compilation
133,335 quasars (M_V <= -23) + 34,231 lower-luminosity AGN + 1,374 BL Lac objects
149,874 sources with detected radio counterparts (6cm or 20cm)
Redshift range: 0.00 to 6.43 (median 1.35)
Absolute magnitude (M_V): -31.5 (most luminous) to -7.8 (faintest)

Usage

from datasets import load_dataset

ds = load_dataset("juliensimon/veron-agn-quasar-catalog", split="train")
df = ds.to_pandas()

from datasets import load_dataset
import matplotlib.pyplot as plt
import numpy as np

df = load_dataset("juliensimon/veron-agn-quasar-catalog", split="train").to_pandas()

# Hubble diagram: absolute magnitude vs redshift, colored by class
mask = df["redshift"].notna() & df["absolute_magnitude"].notna()
fig, ax = plt.subplots(figsize=(10, 6))
for cls, color in zip(["Q", "A", "B"], ["blue", "orange", "red"]):
    sub = df[mask & (df["object_class"] == cls)]
    ax.scatter(sub["redshift"], sub["absolute_magnitude"], s=2, alpha=0.3, color=color, label=cls)
ax.axhline(-23, color="grey", linestyle="--", label="QSO/AGN boundary")
ax.invert_yaxis()  # brighter = up
ax.set_xscale("log")
ax.set_xlabel("Redshift z")
ax.set_ylabel("Absolute V magnitude")
ax.legend()
plt.tight_layout()
plt.show()

# Seyfert sub-type breakdown
print(df["spectral_classification"].value_counts().head(15))

Data source

https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/258

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About the author

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

Citation

@dataset{veron_agn_quasar_catalog,
  title = {Veron-Cetty AGN/Quasar Catalog (13th edition)},
  author = {juliensimon},
  year = {2026},
  url = {https://huggingface.co/datasets/juliensimon/veron-agn-quasar-catalog},
  publisher = {Hugging Face}
}

License

VizieR Scientific-Use Terms

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