Luminosity dependence of the multiple cyclotron lines in 4U 0115+63

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Table 1.

Best fit parameters of the 4U 0115+63 spectral fitting from both observations.

Spectral model	Spectral parameter	Units	Obs ID 2	Obs ID 4
TBabs	N_H	10²²	$4 . 11_{- 0.92}^{+ 0.80}$ $4.11_{-0.92}^{+0.80}$	$1 . 77_{- 1.57}^{+ 1.32}$ $1.77_{-1.57}^{+1.32}$
compTT	T₀	keV	$2 . 14_{- 0.08}^{+ 0.12}$ $2.14_{-0.08}^{+0.12}$	$2 . 56_{- 0.04}^{+ 0.05}$ $2.56_{-0.04}^{+0.05}$
	kT	keV	$7 . 87_{- 0.28}^{+ 1.75}$ $7.87_{-0.28}^{+1.75}$	$61 . 26_{- 37.17}^{+ 36.15}$ $61.26_{-37.17}^{+36.15}$
	τ		$2 . 59_{- 0.68}^{+ 0.62}$ $2.59_{-0.68}^{+0.62}$	$0 . 01_{- 0.01}^{+ 0.16}$ $0.01_{-0.01}^{+0.16}$
	Norm		$0 . 28_{- 0.04}^{+ 0.09}$ $0.28_{-0.04}^{+0.09}$	$6 . 96_{- 0.08}^{+ 0.08} \times$ $6.96_{-0.08}^{+0.08} \times$ 10⁻³
bbodyrad	kT	keV	$0 . 61_{- 0.02}^{+ 0.02}$ $0.61_{-0.02}^{+0.02}$	$0 . 66_{- 0.03}^{+ 0.04}$ $0.66_{-0.03}^{+0.04}$
	Radius	km	$35 . 51_{- 4.50}^{+ 4.12}$ $35.51_{-4.50}^{+4.12}$	$13 . 41_{- 2.79}^{+ 2.73}$ $13.41_{-2.79}^{+2.73}$
Gaussian	E_center	keV	$6 . 44_{- 0.03}^{+ 0.03}$ $6.44_{-0.03}^{+0.03}$	$6 . 39_{- 0.03}^{+ 0.03}$ $6.39_{-0.03}^{+0.03}$
	σ	keV	$0 . 18_{- 0.05}^{+ 0.05}$ $0.18_{-0.05}^{+0.05}$	$0 . 19_{- 0.07}^{+ 0.06}$ $0.19_{-0.07}^{+0.06}$
	Norm ^(a)		$3 . 24_{- 0.62}^{+ 0.78}$ $3.24_{-0.62}^{+0.78}$ × 10⁻³	$1 . 13_{- 0.26}^{+ 0.32} \times$ $1.13_{-0.26}^{+0.32} \times$ 10⁻³
CRSF₁	E_center	keV	$11 . 95_{- 0.12}^{+ 0.11}$ $11.95_{-0.12}^{+0.11}$	$10 . 78_{- 0.17}^{+ 0.22}$ $10.78_{-0.17}^{+0.22}$
	σ	keV	$1 . 80_{- 0.16}^{+ 0.16}$ $1.80_{-0.16}^{+0.16}$	$1 . 21_{- 0.20}^{+ 0.13}$ $1.21_{-0.20}^{+0.13}$
	Depth	keV	$0 . 70_{- 0.22}^{+ 0.30}$ $0.70_{-0.22}^{+0.30}$	$0 . 20_{- 0.07}^{+ 0.09}$ $0.20_{-0.07}^{+0.09}$
CRSF₂	E_center	keV	$16 . 00_{- 0.94}^{+ 0.58}$ $16.00_{-0.94}^{+0.58}$	$14 . 73_{- 0.21}^{+ 0.26}$ $14.73_{-0.21}^{+0.26}$
	σ	keV	$3 . 02_{- 0.76}^{+ 1.06}$ $3.02_{-0.76}^{+1.06}$	$2 . 59_{- 0.26}^{+ 0.26}$ $2.59_{-0.26}^{+0.26}$
	Depth	keV	$1 . 25_{- 0.60}^{+ 1.23}$ $1.25_{-0.60}^{+1.23}$	$2 . 09_{- 0.54}^{+ 0.59}$ $2.09_{-0.54}^{+0.59}$
CRSF₃	E_center	keV	$23 . 83_{- 0.22}^{+ 0.24}$ $23.83_{-0.22}^{+0.24}$	$21 . 06_{- 0.39}^{+ 0.49}$ $21.06_{-0.39}^{+0.49}$
	σ	keV	$3 . 07_{- 0.46}^{+ 0.38}$ $3.07_{-0.46}^{+0.38}$	$4 . 19_{- 0.43}^{+ 0.47}$ $4.19_{-0.43}^{+0.47}$
	Depth	keV	$2 . 82_{- 1.32}^{+ 0.79}$ $2.82_{-1.32}^{+0.79}$	$5 . 01_{- 0.81}^{+ 0.99}$ $5.01_{-0.81}^{+0.99}$
CRSF₄	E_center	keV	$34 . 02_{- 0.44}^{+ 1.27}$ $34.02_{-0.44}^{+1.27}$	–
	σ	keV	$3 . 83_{- 0.69}^{+ 1.17}$ $3.83_{-0.69}^{+1.17}$	–
	Depth	keV	$2 . 86_{- 1.60}^{+ 1.96}$ $2.86_{-1.60}^{+1.96}$	–
CRSF₅	E_center	keV	$47 . 36_{- 0.71}^{+ 1.27}$ $47.36_{-0.71}^{+1.27}$	–
	σ	keV	$7 . 59_{- 2.82}^{+ 0.41}$ $7.59_{-2.82}^{+0.41}$	–
	Depth	keV	$8 . 00_{- 4.67}^{+ 2.00}$ $8.00_{-4.67}^{+2.00}$	–
Cross normalization			$0 . 994_{- 0.001}^{+ 0.001}$ $0.994_{-0.001}^{+0.001}$	$1 . 001_{- 0.001}^{+ 0.001}$ $1.001_{-0.001}^{+0.001}$
Reduced χ² (d.o.f.)			1.29 (421)	1.28 (369)
Flux	(3–50 keV)	erg cm⁻² s⁻¹	$2 . 06_{- 0.01}^{+ 0.01}$ $2.06_{-0.01}^{+0.01}$ × 10⁻⁸	$4 . 83_{- 0.01}^{+ 0.01}$ $4.83_{-0.01}^{+0.01}$ × 10⁻⁹
Luminosity	(3–50 keV)	erg s⁻¹	$12 . 08_{- 0.06}^{+ 0.02}$ $12.08_{-0.06}^{+0.02}$ × 10³⁷	$2 . 83_{- 0.01}^{+ 0.01}$ $2.83_{-0.01}^{+0.01}$ × 10³⁷

Notes. The errors are at a 90% confidence interval.

^(a)

The normalization factor is in units of total photon cm⁻² s⁻¹ in the line.

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