Searching for supermassive black hole binaries within SRG/eROSITA-De - I. Properties of the X-ray selected candidates

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Volume 698 (May 2025)

A&A, 698 (2025) A192

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Table 3.

Stacked X-ray spectral properties of the monitored SMBHB candidates.

			`tbabs`_Gal`tbabs`_Intr`zpowerlaw`				`tbabs`_Gal`tbabs`_Intr`diskbb`
Source ^a	Obs.	Exposure	N_H ^b	Γ	Norm.	stat/d.o.f.=χ²	N_H	T_in	Norm.	stat/d.o.f.=χ²
		(s)	(× 10²⁰ cm⁻²)		(× 10⁻⁴)		(× 10²⁰ cm⁻²)	(eV)
1	NICER	15981	$1 . 57_{- 1.57}^{+ 141}$ $1.57_{-1.57}^{+141}$ ^c	$5 . 35_{- 0.94}^{+ 1.64}$ $5.35_{-0.94}^{+1.64}$	$2 . 13_{- 1.49}^{+ 2.13} \times 10^{- 2}$ $2.13_{-1.49}^{+2.13}\times 10^{-2}$	180.33/144=1.25	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$69_{- 9.93}^{+ 11.6}$ $69_{-9.93}^{+11.6}$	$5 . 24_{- 3.02}^{+ 8.18} \times 10^{2}$ $5.24_{-3.02}^{+8.18}\times 10^{2}$	180.16/147=1.23

2	NICER	35802	$4 . 48_{- 4.48}^{+ 0.6}$ $4.48_{-4.48}^{+0.6}$	$1 . 97_{- 0.08}^{+ 0.06}$ $1.97_{-0.08}^{+0.06}$	$1 . 99_{- 0.05}^{+ 0.05}$ $1.99_{-0.05}^{+0.05}$	251.61/169=1.49	$0 . 0_{- - 0.0}^{+ - 0.0}$ $0.0_{--0.0}^{+-0.0}$	$478_{- 12}^{+ 13}$ $478_{-12}^{+13}$	$0 . 48_{- 0.05}^{+ 0.05}$ $0.48_{-0.05}^{+0.05}$	305.93/173=1.77
2	Swift-XRT	70119	$0 . 0_{- 0.0}^{+ 5.0}$ $0.0_{-0.0}^{+5.0}$	$1 . 67_{- 0.07}^{+ 0.08}$ $1.67_{-0.07}^{+0.08}$	$1 . 22_{- 0.075}^{+ 0.088}$ $1.22_{-0.075}^{+0.088}$	697.14/1020=0.68	$0 . 0_{- - 0.0}^{+ 0.0}$ $0.0_{--0.0}^{+0.0}$	$1260_{- 66}^{+ 72}$ $1260_{-66}^{+72}$	$113_{- 20}^{+ 23}$ $113_{-20}^{+23}$	750.66/1020=0.74

3	NICER	24130	$19 . 3_{- 11.2}^{+ 2.42}$ $19.3_{-11.2}^{+2.42}$	$2 . 84_{- 0.18}^{+ 0.19}$ $2.84_{-0.18}^{+0.19}$	$3 . 19_{- 0.19}^{+ 0.19}$ $3.19_{-0.19}^{+0.19}$	246.64/176=1.40	$5 . 92_{- 2.73}^{+ 994} \times 10^{5}$ $5.92_{-2.73}^{+994}\times 10^{5}$	$998_{- 991}^{+ 514}$ $998_{-991}^{+514}$	$4 . 72_{- 2.39}^{+ 200000} \times 10^{11}$ $4.72_{-2.39}^{+200000}\times 10^{11}$	349.12/180=1.94
4	NICER	40670	$0 . 75_{- 0.75}^{+ 1.29}$ $0.75_{-0.75}^{+1.29}$	$1 . 94_{- 5.99}^{+ 6.38}$ $1.94_{-5.99}^{+6.38}$	$1 . 85_{- 0.045}^{+ 0.045}$ $1.85_{-0.045}^{+0.045}$	241.88/181=1.34	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$353_{- 8.36}^{+ 9.12}$ $353_{-8.36}^{+9.12}$	$1 . 44_{- 0.14}^{+ 0.141}$ $1.44_{-0.14}^{+0.141}$	238.09/185=1.29
6	NICER	63663	$0 . 0_{- 0.0}^{+ 3.87}$ $0.0_{-0.0}^{+3.87}$	$2 . 06_{- 0.035}^{+ 0.05}$ $2.06_{-0.035}^{+0.05}$	$6 . 52_{- 0.09}^{+ 0.09}$ $6.52_{-0.09}^{+0.09}$	233.7/171=1.37	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$539_{- 4.32}^{+ 4.63}$ $539_{-4.32}^{+4.63}$	$0 . 98_{- 0.03}^{+ 0.03}$ $0.98_{-0.03}^{+0.03}$	700.15/175=4.00

7	NICER	108169	$3 . 82_{- 0.39}^{+ 0.14}$ $3.82_{-0.39}^{+0.14}$	$2 . 26_{- 0.02}^{+ 0.02}$ $2.26_{-0.02}^{+0.02}$	$4 . 27_{- 0.03}^{+ 0.03}$ $4.27_{-0.03}^{+0.03}$	528.7/186=2.84	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$354_{- 1.74}^{+ 3.21}$ $354_{-1.74}^{+3.21}$	$3 . 46_{- 0.12}^{+ 0.07}$ $3.46_{-0.12}^{+0.07}$	1922.37/190=10.12
	Swift-XRT	89832	$0 . 0_{- 0.0}^{+ 2.22}$ $0.0_{-0.0}^{+2.22}$	$1 . 8_{- 0.05}^{+ 0.05}$ $1.8_{-0.05}^{+0.05}$	$1 . 91_{- 0.08}^{+ 0.09}$ $1.91_{-0.08}^{+0.09}$	766.03/1020=0.75	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$1060_{- 36}^{+ 38}$ $1060_{-36}^{+38}$	$3 . 15_{- 0.4}^{+ 0.4} \times 10^{- 2}$ $3.15_{-0.4}^{+0.4}\times 10^{-2}$	989.81/1020=0.97
	XMM-Newton	112600	$2 . 75_{- 0.18}^{+ 0.2}$ $2.75_{-0.18}^{+0.2}$	$2 . 3_{- 0.014}^{+ 0.015}$ $2.3_{-0.014}^{+0.015}$	$2 . 23_{- 0.017}^{+ 0.018}$ $2.23_{-0.017}^{+0.018}$	8601.12/9166=0.94	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$426_{- 0.53}^{+ 0.52}$ $426_{-0.53}^{+0.52}$	$0 . 96_{- 0.005}^{+ 0.005}$ $0.96_{-0.005}^{+0.005}$	14694.14/9166=1.60
8	NICER	39761	$0 . 0_{- 0.0}^{+ 0.0}$ $0.0_{-0.0}^{+0.0}$	$1 . 95_{- 0.03}^{+ 0.02}$ $1.95_{-0.03}^{+0.02}$	$9 . 11_{- 0.07}^{+ 0.1}$ $9.11_{-0.07}^{+0.1}$	219.20/185=1.18	$0 . 04_{- 0.04}^{+ 0.49}$ $0.04_{-0.04}^{+0.49}$	$463_{- 4.88}^{+ 4.8}$ $463_{-4.88}^{+4.8}$	$2 . 61_{- 0.11}^{+ 0.11}$ $2.61_{-0.11}^{+0.11}$	546.38/189=2.89
10	NICER	17335	$6 . 36_{- 2.36}^{+ 2.76}$ $6.36_{-2.36}^{+2.76}$	$1 . 34_{- 0.12}^{+ 0.13}$ $1.34_{-0.12}^{+0.13}$	$1 . 23_{- 0.071}^{+ 0.061}$ $1.23_{-0.071}^{+0.061}$	228.17/155=1.47	$0 . 04_{- 0.04}^{+ 2.45}$ $0.04_{-0.04}^{+2.45}$	$1030_{- 93}^{+ 72}$ $1030_{-93}^{+72}$	$2 . 35_{- 0.48}^{+ 0.88} \times 10^{- 2}$ $2.35_{-0.48}^{+0.88}\times 10^{-2}$	231.39/158=1.46

13	NICER	31238	$5 . 56_{- 3.43}^{+ 8.64}$ $5.56_{-3.43}^{+8.64}$	$2 . 03_{- 0.13}^{+ 0.14}$ $2.03_{-0.13}^{+0.14}$	$3 . 70_{- 0.14}^{+ 0.16}$ $3.70_{-0.14}^{+0.16}$	250.41/176=1.42	$2 . 06_{- 0.43}^{+ 97.90} \times 10^{4}$ $2.06_{-0.43}^{+97.90}\times 10^{4}$	$1000_{- 3.95}^{+ - 17.60} \times 10^{3}$ $1000_{-3.95}^{+-17.60}\times 10^{3}$	$1 . 0_{- 0.9}^{+ 10000} \times 10^{20}$ $1.0_{-0.9}^{+10000}\times 10^{20}$	501.73/180=2.79

Notes.

The number of the sources refer to Table 1.

Intrinsic column density.

The errors in the measurements correspond to the 68% confidence interval.

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