Flux variability of the “10 keV feature” of 4U 0115+63

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Table B.1.

Best parameters of the averged spectral fit with confidence limits.

Parameter	N1	O1	N2	O2
c_FPMA	1.00	1.00	1.00	1.00
c_FPMB	0.9619 ± 0.0017	0.9619 ± 0.0017	0.9732 ± 0.0016	0.9731 ± 0.0016
c_XRT		0.941 ± 0.012		0.890 ± 0.013
N_H [10²² cm⁻²]	2.3 ± 0.8	1.93 ± 0.07	1.2 ± 0.7	1.99 ± 0.07
E_CRSF, 0 [keV]	11.78 ± 0.09	11.76 ± 0.08	$11 . 76_{- 0.10}^{+ 0.11}$ $Mathematical equation: $ 11.76^{+0.11}_{-0.10} $$	11.71 ± 0.10
σ_CRSF, 0 [keV]	1.23b	1.25b	1.39b	1.42b
D_CRSF, 0 [keV]	$0 . 173_{- 0.024}^{+ 0.028}$ $Mathematical equation: $ 0.173^{+0.028}_{-0.024} $$	$0 . 182_{- 0.023}^{+ 0.025}$ $Mathematical equation: $ 0.182^{+0.025}_{-0.023} $$	$0 . 134_{- 0.029}^{+ 0.034}$ $Mathematical equation: $ 0.134^{+0.034}_{-0.029} $$	$0 . 155_{- 0.030}^{+ 0.036}$ $Mathematical equation: $ 0.155^{+0.036}_{-0.030} $$
E_CRSF, 1 [keV]	23.6a	23.5a	23.5a	23.4a
σ_CRSF, 1 [keV]	2.45b	2.50b	2.78b	2.85b
D_CRSF, 1 [keV]	$1 . 01_{- 0.13}^{+ 0.14}$ $Mathematical equation: $ 1.01^{+0.14}_{-0.13} $$	$1 . 05_{- 0.13}^{+ 0.14}$ $Mathematical equation: $ 1.05^{+0.14}_{-0.13} $$	$1 . 12_{- 0.18}^{+ 0.20}$ $Mathematical equation: $ 1.12^{+0.20}_{-0.18} $$	$1 . 15_{- 0.17}^{+ 0.19}$ $Mathematical equation: $ 1.15^{+0.19}_{-0.17} $$
E_CRSF, 2 [keV]	35.3a	35.3a	35.3a	35.1a
σ_CRSF, 2 [keV]	3.68b	3.75b	4.16b	4.27b
D_CRSF, 2 [keV]	1.9 ± 0.4	1.9 ± 0.4	2.1 ± 0.6	$2 . 2_{- 0.5}^{+ 0.6}$ $Mathematical equation: $ 2.2^{+0.6}_{-0.5} $$
E_CRSF, 3 [keV]	47.1a	47.0a	47.0a	46.8a
σ_CRSF, 3 [keV]	4.91b	5.01b	5.55b	5.70b
D_CRSF, 3 [keV]	2.1 ± 0.9	2.2 ± 0.9	< 1.88	$1 . 1_{- 1.0}^{+ 1.1}$ $Mathematical equation: $ 1.1^{+1.1}_{-1.0} $$
Γ	$0 . 37_{- 0.07}^{+ 0.06}$ $Mathematical equation: $ 0.37^{+0.06}_{-0.07} $$	0.390 ± 0.030	0.34 ± 0.05	0.40 ± 0.04
E_fold [keV]	$9 . 50_{- 0.27}^{+ 0.28}$ $Mathematical equation: $ 9.50^{+0.28}_{-0.27} $$	$9 . 56_{- 0.23}^{+ 0.24}$ $Mathematical equation: $ 9.56^{+0.24}_{-0.23} $$	$9 . 14_{- 0.28}^{+ 0.30}$ $Mathematical equation: $ 9.14^{+0.30}_{-0.28} $$	$9 . 33_{- 0.26}^{+ 0.28}$ $Mathematical equation: $ 9.33^{+0.28}_{-0.26} $$
F_PL [keV s⁻¹ cm⁻²]	$8 . 68_{- 0.27}^{+ 0.26}$ $Mathematical equation: $ 8.68^{+0.26}_{-0.27} $$	$8 . 77_{- 0.14}^{+ 0.15}$ $Mathematical equation: $ 8.77^{+0.15}_{-0.14} $$	6.04 ± 0.12	6.16 ± 0.09
A_10 keV [ph s⁻¹ cm⁻²]	1.00	1.00	1.00	1.00
E_10 keV [keV]	$6 . 64_{- 0.33}^{+ 0.30}$ $Mathematical equation: $ 6.64^{+0.30}_{-0.33} $$	$6 . 84_{- 0.18}^{+ 0.17}$ $Mathematical equation: $ 6.84^{+0.17}_{-0.18} $$	7.41 ± 0.15	7.53 ± 0.12
σ_10 keV [keV]	$3 . 83_{- 0.17}^{+ 0.18}$ $Mathematical equation: $ 3.83^{+0.18}_{-0.17} $$	3.75 ± 0.11	3.30 ± 0.09	3.23 ± 0.08
F_10 keV [keV s⁻¹ cm⁻²]	$2 . 69_{- 0.27}^{+ 0.29}$ $Mathematical equation: $ 2.69^{+0.29}_{-0.27} $$	2.5932 ± 0.0025	$1 . 69_{- 0.10}^{+ 0.11}$ $Mathematical equation: $ 1.69^{+0.11}_{-0.10} $$	$1 . 6530_{- 0.0014}^{+ 0.0017}$ $Mathematical equation: $ 1.6530^{+0.0017}_{-0.0014} $$
F_10 keV/F_PL	$0 . 310_{- 0.029}^{+ 0.033}$ $Mathematical equation: $ 0.310^{+0.033}_{-0.029} $$	$0 . 296_{- 0.018}^{+ 0.019}$ $Mathematical equation: $ 0.296^{+0.019}_{-0.018} $$	0.280 ± 0.016	0.268 ± 0.013
A_FeKα [10⁻³ ph s⁻¹ cm⁻²]	1.4 ± 0.4	1.60 ± 0.28	1.19 ± 0.21	1.13 ± 0.19
E_FeKα [keV]	6.40	6.40	6.40	6.40
A_FeXXV Kα [10⁻³ ph s⁻¹ cm⁻²]	1.02 ± 0.30	1.11 ± 0.28	$1 . 02_{- 0.20}^{+ 0.19}$ $Mathematical equation: $ 1.02^{+0.19}_{-0.20} $$	0.96 ± 0.19
E_FeXXV Kα [keV]	6.69	6.69	6.69	6.69
A_FeXXVI Kα [10⁻³ ph s⁻¹ cm⁻²]	0.45 ± 0.28	0.56 ± 0.26	< 0.332	< 0.323
E_FeXXVI Kα [keV]	6.97	6.97	6.97	6.97
c_{CRSF, σ}	$0 . 104_{- 0.007}^{+ 0.008}$ $Mathematical equation: $ 0.104^{+0.008}_{-0.007} $$	0.106 ± 0.007	$0 . 118_{- 0.010}^{+ 0.011}$ $Mathematical equation: $ 0.118^{+0.011}_{-0.010} $$	$0 . 122_{- 0.010}^{+ 0.011}$ $Mathematical equation: $ 0.122^{+0.011}_{-0.010} $$
red. χ² / d.o.f.	1.49 / 326	1.50 / 441	1.53 / 325	1.42 / 439

Notes. The NuSTAR observations were fitted with (O1 and O2) and without (N1 and N2) using the corresponding Swift observation. The symbols indicate as follows: Fixed aSet to the multiple integer value of E_CRSF, 0bCoupled to the respective CRSF energy via c_CRSF, σFor fitting, F_10 keV is coupled to F_PL via F_10 keV/F_PL. The uncertainty of F₁₀ keV is derived by error propagation from the uncertainties of F_PL and F_10 keV/F_PL.

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