A supermassive black hole under the radar: Repeating X-ray variability in a Seyfert galaxy

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Volume 706 (February 2026)

A&A, 706 (2026) A359

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Table 2.

X-ray spectral parameters of the source in the different epochs.

Epoch	Instrument	C/ν^a	N_H^b	Γ	kT^c	F_X, s^d	F_X, h^e	L_X^f
2000 Jun. 21	XMM	332.08/316	–	1.60 ± 0.05	0.11 ± 0.01	0.95 ± 0.02	1.17 ± 0.08	2.09 ± 0.08
2006 Jun. 11	XMM	192.28/182	–	1.20 ± 0.09	0.032 ± 0.001	0.57 ± 0.06	1.2 ± 0.1	1.7 ± 0.1
2006 Jun. 14	XMM	200.53/189	–	0.8 ± 0.1	0.12 ± 0.04	0.32 ± 0.03	1.5 ± 0.2	1.8 ± 0.2
2010 Jun. 24	XMM	108.89/102	–	$1 . 77_{- 0.08}^{+ 0.12}$ $1.77_{-0.08}^{+0.12}$	0.95 ± 0.02	1.95 ± 0.09	1.9 ± 0.2	3.7 ± 0.2
2010 Nov. 11	CXO	165.98/176	–	1.4 ± 0.1	–	0.49 ± 0.04	1.1 ± 0.1	1.6 ± 0.1
2010 Dec. 03	XMM	193.69/215	–	1.72 ± 0.07	0.13 ± 0.02	1.99 ± 0.09	1.8 ± 0.2	3.7 ± 0.2
2010 Dec. 05	XMM	179.80/191	–	1.98 ± 0.06	0.13 ± 0.02	4.6 ± 0.2	3.0 ± 0.3	$7 . 5_{- 0.3}^{+ 0.4}$ $7.5_{-0.3}^{+0.4}$
2010 Dec. 11	XMM	76.39/69	–	2.0 ± 0.2	0.06 ± 0.02	3.2 ± 0.03	$2 . 3_{- 0.4}^{+ 0.5}$ $2.3_{-0.4}^{+0.5}$	$5 . 4_{- 0.5}^{+ 0.6}$ $5.4_{-0.5}^{+0.6}$
2012 Jun. 02	XMM	238.15/229	–	1.99 ± 0.06	0.09 ± 0.01	1.55 ± 0.04	$1 . 07_{- 0.07}^{+ 0.08}$ $1.07_{-0.07}^{+0.08}$	2.57 ± 0.08
2012 Jun. 04	XMM	217.47/198	0.07 ± 0.01	1.9 ± 0.1	0.084 ± 0.005	1.7 ± 0.1	$0 . 81_{- 0.07}^{+ 0.08}$ $0.81_{-0.07}^{+0.08}$	2.4 ± 0.1
2020 Mar. 03	CXO	241.84/248	0.4 ± 0.3	1.3 ± 0.2	–	$1 . 0_{- 0.2}^{+ 0.3}$ $1.0_{-0.2}^{+0.3}$	2.9 ± 0.2	$3 . 9_{- 0.3}^{+ 0.4}$ $3.9_{-0.3}^{+0.4}$
2020 Mar. 04	CXO	221.13/245	0.2 ± 0.2	1.1 ± 0.2	–	0.8 ± 0.2	3.2 ± 0.3	$3 . 9_{- 0.3}^{+ 0.4}$ $3.9_{-0.3}^{+0.4}$
2020 Mar. 04	CXO	235.21/264	$0 . 2_{- 0.2}^{+ 0.3}$ $0.2_{-0.2}^{+0.3}$	1.2 ± 0.2	–	$1 . 1_{- 0.2}^{+ 0.3}$ $1.1_{-0.2}^{+0.3}$	3.6 ± 0.3	$4 . 6_{- 0.4}^{+ 0.5}$ $4.6_{-0.4}^{+0.5}$
2020 Aug. 11	CXO	300.77/276	$0 . 04_{- 0.04}^{+ 0.13}$ $0.04_{-0.04}^{+0.13}$	1.8 ± 0.1	–	$2 . 2_{- 0.2}^{+ 0.4}$ $2.2_{-0.2}^{+0.4}$	2.8 ± 0.2	$4 . 9_{- 0.3}^{+ 0.5}$ $4.9_{-0.3}^{+0.5}$
2020 Nov. 02	CXO	46.57/63	$1 . 7_{- 1.0}^{+ 1.2}$ $1.7_{-1.0}^{+1.2}$	1.3 ± 0.6	–	$0 . 5_{- 0.3}^{+ 0.8}$ $0.5_{-0.3}^{+0.8}$	1.5 ± 0.3	$2 . 0_{- 0.4}^{+ 0.9}$ $2.0_{-0.4}^{+0.9}$
2020 Nov. 03	CXO	209.59/204	1.2 ± 0.04	1.7 ± 0.2	–	$1 . 7_{- 0.6}^{+ 0.8}$ $1.7_{-0.6}^{+0.8}$	$2 . 7_{- 0.2}^{+ 0.3}$ $2.7_{-0.2}^{+0.3}$	$4 . 3_{- 0.5}^{+ 0.8}$ $4.3_{-0.5}^{+0.8}$
2020 Nov. 08	CXO	132.27/125	–	1.8 ± 0.1	–	$2 . 6_{- 0.4}^{+ 0.5}$ $2.6_{-0.4}^{+0.5}$	2.9 ± 0.4	$5 . 4_{- 0.5}^{+ 0.6}$ $5.4_{-0.5}^{+0.6}$

Notes.

Value of the statistic divided by the degrees of freedom.

Intrinsic absorption in units of 10²² cm⁻².

Temperature of the blackbody component in keV.

Unabsorbed flux in the soft 0.3–2 keV band, in units of 10⁻¹³ erg/s/cm².

Unabsorbed flux in the hard 2–10 keV band, in units of 10⁻¹³ erg/s/cm².

Unabsorbed luminosity in the full 0.3–10 keV band, in units of 10⁴¹ erg/s.

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