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

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Table B.2.

Best parameters of the simultaneous spectral fit of the flux-resolved NuSTAR observations of N1 and N2 with confidence limits.

Parameter	R11	R12	R13	R14	R21	R22	R23	R24
c_FPMB	0.9610 ± 0.0017	0.9610 ± 0.0017	0.9610 ± 0.0017	0.9610 ± 0.0017	0.9771 ± 0.0016	0.9771 ± 0.0016	0.9771 ± 0.0016	0.9771 ± 0.0016
N_H	2.7 ± 0.8	2.7 ± 0.8	2.7 ± 0.8	2.7 ± 0.8	0.9 ± 0.7	0.9 ± 0.7	0.9 ± 0.7	0.9 ± 0.7
E_CRSF, 0	11.90 ± 0.13	$11 . 52_{- 0.18}^{+ 0.17}$ $Mathematical equation: $ 11.52^{+0.17}_{-0.18} $$	$11 . 69_{- 0.19}^{+ 0.18}$ $Mathematical equation: $ 11.69^{+0.18}_{-0.19} $$	$11 . 58_{- 0.17}^{+ 0.16}$ $Mathematical equation: $ 11.58^{+0.16}_{-0.17} $$	$12 . 14_{- 0.15}^{+ 0.16}$ $Mathematical equation: $ 12.14^{+0.16}_{-0.15} $$	$11 . 82_{- 0.17}^{+ 0.16}$ $Mathematical equation: $ 11.82^{+0.16}_{-0.17} $$	$11 . 41_{- 0.22}^{+ 0.21}$ $Mathematical equation: $ 11.41^{+0.21}_{-0.22} $$	11.20 ± 0.16
σ_CRSF, 0	1.29b	1.25b	1.27b	1.26b	1.38b	1.34b	1.29b	1.27b
D_CRSF, 0	0.16 ± 0.04	$0 . 17_{- 0.05}^{+ 0.06}$ $Mathematical equation: $ 0.17^{+0.06}_{-0.05} $$	$0 . 26_{- 0.06}^{+ 0.07}$ $Mathematical equation: $ 0.26^{+0.07}_{-0.06} $$	$0 . 23_{- 0.05}^{+ 0.06}$ $Mathematical equation: $ 0.23^{+0.06}_{-0.05} $$	0.10 ± 0.04	0.15 ± 0.06	$0 . 21_{- 0.08}^{+ 0.09}$ $Mathematical equation: $ 0.21^{+0.09}_{-0.08} $$	0.26 ± 0.09
E_CRSF, 1	23.8a	23.0a	23.4a	23.2a	24.3a	23.6a	22.8a	22.4a
σ_CRSF, 1	2.58b	2.50b	2.54b	2.51b	2.75b	2.68b	2.59b	2.54b
D_CRSF, 1	$1 . 36_{- 0.20}^{+ 0.22}$ $Mathematical equation: $ 1.36^{+0.22}_{-0.20} $$	$1 . 14_{- 0.23}^{+ 0.25}$ $Mathematical equation: $ 1.14^{+0.25}_{-0.23} $$	$0 . 71_{- 0.26}^{+ 0.28}$ $Mathematical equation: $ 0.71^{+0.28}_{-0.26} $$	$0 . 77_{- 0.19}^{+ 0.20}$ $Mathematical equation: $ 0.77^{+0.20}_{-0.19} $$	$1 . 15_{- 0.17}^{+ 0.20}$ $Mathematical equation: $ 1.15^{+0.20}_{-0.17} $$	$1 . 04_{- 0.22}^{+ 0.25}$ $Mathematical equation: $ 1.04^{+0.25}_{-0.22} $$	$0 . 81_{- 0.26}^{+ 0.27}$ $Mathematical equation: $ 0.81^{+0.27}_{-0.26} $$	$1 . 33_{- 0.30}^{+ 0.33}$ $Mathematical equation: $ 1.33^{+0.33}_{-0.30} $$
E_CRSF, 2	35.7a	34.6a	35.1a	34.8a	36.4a	35.4a	34.2a	33.6a
σ_CRSF, 2	3.87b	3.75b	3.80b	3.77b	4.13b	4.02b	3.88b	3.81b
D_CRSF, 2	$2 . 1_{- 0.6}^{+ 0.7}$ $Mathematical equation: $ 2.1^{+0.7}_{-0.6} $$	2.5 ± 0.8	2.1 ± 1.0	1.6 ± 0.7	$1 . 4_{- 0.5}^{+ 0.6}$ $Mathematical equation: $ 1.4^{+0.6}_{-0.5} $$	2.7 ± 0.9	2.7 ± 1.0	$2 . 8_{- 1.1}^{+ 1.2}$ $Mathematical equation: $ 2.8^{+1.2}_{-1.1} $$
E_CRSF, 3	47.6a	46.1a	46.8a	46.3a	48.5a	47.3a	45.6a	44.8a
σ_CRSF, 3	5.16b	5.00b	5.07b	5.02b	5.51b	5.36b	5.18b	5.08b
D_CRSF, 3	$2 . 4_{- 1.5}^{+ 1.6}$ $Mathematical equation: $ 2.4^{+1.6}_{-1.5} $$	$4 . 1_{- 1.9}^{+ 2.0}$ $Mathematical equation: $ 4.1^{+2.0}_{-1.9} $$	$2 . 8_{- 2.5}^{+ 2.6}$ $Mathematical equation: $ 2.8^{+2.6}_{-2.5} $$	$2 . 0_{- 1.7}^{+ 1.8}$ $Mathematical equation: $ 2.0^{+1.8}_{-1.7} $$	< 0.785	$3 . 2_{- 2.0}^{+ 2.2}$ $Mathematical equation: $ 3.2^{+2.2}_{-2.0} $$	< 4.77	< 4.65
Γ	$0 . 38_{- 0.08}^{+ 0.07}$ $Mathematical equation: $ 0.38^{+0.07}_{-0.08} $$	0.46 ± 0.09	0.49 ± 0.10	0.44 ± 0.08	0.29 ± 0.05	0.41 ± 0.07	0.43 ± 0.08	0.38 ± 0.09
E_fold	9.5 ± 0.5	$10 . 2_{- 0.7}^{+ 0.8}$ $Mathematical equation: $ 10.2^{+0.8}_{-0.7} $$	$10 . 1_{- 0.8}^{+ 1.0}$ $Mathematical equation: $ 10.1^{+1.0}_{-0.8} $$	9.5 ± 0.6	$9 . 04_{- 0.19}^{+ 0.25}$ $Mathematical equation: $ 9.04^{+0.25}_{-0.19} $$	9.4 ± 0.6	$9 . 5_{- 0.7}^{+ 0.8}$ $Mathematical equation: $ 9.5^{+0.8}_{-0.7} $$	$9 . 1_{- 0.7}^{+ 0.8}$ $Mathematical equation: $ 9.1^{+0.8}_{-0.7} $$
F_PL	7.01 ± 0.24	9.5 ± 0.4	10.8 ± 0.4	14.0 ± 0.4	$5 . 27_{- 0.11}^{+ 0.12}$ $Mathematical equation: $ 5.27^{+0.12}_{-0.11} $$	$6 . 31_{- 0.12}^{+ 0.13}$ $Mathematical equation: $ 6.31^{+0.13}_{-0.12} $$	$7 . 58_{- 0.17}^{+ 0.18}$ $Mathematical equation: $ 7.58^{+0.18}_{-0.17} $$	$9 . 86_{- 0.22}^{+ 0.24}$ $Mathematical equation: $ 9.86^{+0.24}_{-0.22} $$
E_10 keV	$6 . 87_{- 0.31}^{+ 0.29}$ $Mathematical equation: $ 6.87^{+0.29}_{-0.31} $$	$6 . 87_{- 0.31}^{+ 0.29}$ $Mathematical equation: $ 6.87^{+0.29}_{-0.31} $$	$6 . 87_{- 0.31}^{+ 0.29}$ $Mathematical equation: $ 6.87^{+0.29}_{-0.31} $$	$6 . 87_{- 0.31}^{+ 0.29}$ $Mathematical equation: $ 6.87^{+0.29}_{-0.31} $$	$7 . 39_{- 0.14}^{+ 0.13}$ $Mathematical equation: $ 7.39^{+0.13}_{-0.14} $$	$7 . 39_{- 0.14}^{+ 0.13}$ $Mathematical equation: $ 7.39^{+0.13}_{-0.14} $$	$7 . 39_{- 0.14}^{+ 0.13}$ $Mathematical equation: $ 7.39^{+0.13}_{-0.14} $$	$7 . 39_{- 0.14}^{+ 0.13}$ $Mathematical equation: $ 7.39^{+0.13}_{-0.14} $$
σ_10 keV	$3 . 75_{- 0.18}^{+ 0.19}$ $Mathematical equation: $ 3.75^{+0.19}_{-0.18} $$	3.66 ± 0.19	3.80 ± 0.19	3.62 ± 0.20	3.45 ± 0.10	3.23 ± 0.11	$3 . 10_{- 0.16}^{+ 0.15}$ $Mathematical equation: $ 3.10^{+0.15}_{-0.16} $$	$2 . 86_{- 0.19}^{+ 0.18}$ $Mathematical equation: $ 2.86^{+0.18}_{-0.19} $$
F_10 keV	$2 . 31_{- 0.26}^{+ 0.28}$ $Mathematical equation: $ 2.31^{+0.28}_{-0.26} $$	2.8 ± 0.4	3.1 ± 0.4	3.0 ± 0.4	1.77 ± 0.12	1.67 ± 0.12	1.70 ± 0.18	1.57 ± 0.20
F_10 keV/F_PL	0.33 ± 0.04	0.29 ± 0.04	0.29 ± 0.04	$0 . 217_{- 0.024}^{+ 0.026}$ $Mathematical equation: $ 0.217^{+0.026}_{-0.024} $$	0.335 ± 0.021	$0 . 265_{- 0.018}^{+ 0.019}$ $Mathematical equation: $ 0.265^{+0.019}_{-0.018} $$	$0 . 224_{- 0.022}^{+ 0.023}$ $Mathematical equation: $ 0.224^{+0.023}_{-0.022} $$	0.159 ± 0.020
A_Fe Kα	1.1 ± 0.4	1.5 ± 0.8	2.2 ± 1.0	2.1 ± 0.9	0.86 ± 0.22	1.4 ± 0.4	2.5 ± 0.7	2.7 ± 0.9
A_FeXXV Kα	0.7 ± 0.4	$1 . 8_{- 0.8}^{+ 0.7}$ $Mathematical equation: $ 1.8^{+0.7}_{-0.8} $$	< 1.38	1.5 ± 0.9	0.88 ± 0.21	0.8 ± 0.4	1.3 ± 0.7	2.3 ± 0.9
A_FeXXVI Kα	< 0.535	< 0.775	1.0 ± 0.9	1.3 ± 0.9	< 0.0884	0.9 ± 0.4	< 0.802	1.1 ± 0.9
c_{CRSF, σ}	0.108 ± 0.008	0.108 ± 0.008	0.108 ± 0.008	0.108 ± 0.008	0.113 ± 0.010	0.113 ± 0.010	0.113 ± 0.010	0.113 ± 0.010

Notes. N_H is given in units of [10²² cm⁻²], E_*, σ_* and D_* are given in [keV], A_Fe* have the unit of [10⁻³ ph s⁻¹ cm⁻²] and F_* are given in [keV s⁻¹ cm⁻²]. The symbols indicate as follows: Tied together for all spectral fits, aSet to the multiple integer value of E_CRSF, 0, bCoupled to the respective CRSF energy via c_{CRSF, σ}, Coupled to F_PL via F_10 keV/F_PL. The uncertainty of F_10 keV is derived by error propagation from the uncertainties of F_PL and F_10 keV/F_PL.

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