An in-depth analysis of the variable cyclotron lines in GX 301−2

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Table 2.

Fit parameters of the most relevant fits to the phase-averaged spectrum.

Parameter	WOF	TS X	TS Y	TS Z
N_H, 1 [10²² cm⁻²]	30.0 ± 1.3	$24 . 8_{- 5.4}^{+ 1.6}$ $24.8^{+1.6}_{-5.4}$	41 ± 4	$25 . 8_{- 1.6}^{+ 2.0}$ $25.8^{+2.0}_{-1.6}$
N_H, 2 [10²⁴ cm⁻²]	$2 . 94_{- 0.34}^{+ 0.28}$ $2.94^{+0.28}_{-0.34}$	$2 . 59_{- 0.74}^{+ 0.30}$ $2.59^{+0.30}_{-0.74}$	$1 . 93_{- 0.26}^{+ 0.32}$ $1.93^{+0.32}_{-0.26}$	$2 . 69_{- 0.19}^{+ 0.22}$ $2.69^{+0.22}_{-0.19}$
f_pcf	$0 . 514_{- 0.029}^{+ 0.028}$ $0.514^{+0.028}_{-0.029}$	$0 . 64_{- 0.05}^{+ 0.14}$ $0.64^{+0.14}_{-0.05}$	$0 . 543_{- 0.030}^{+ 0.034}$ $0.543^{+0.034}_{-0.030}$	$0 . 46_{- 0.05}^{+ 0.04}$ $0.46^{+0.04}_{-0.05}$
F₁ [keV s⁻¹ cm⁻²] ^(a)	11.7 ± 0.6	$7 . 0_{- 0.7}^{+ 0.5}$ $7.0^{+0.5}_{-0.7}$	$10 . 6_{- 0.4}^{+ 0.6}$ $10.6^{+0.6}_{-0.4}$	$16 . 8_{- 0.9}^{+ 1.6}$ $16.8^{+1.6}_{-0.9}$
Γ	$0 . 28_{- 0.16}^{+ 0.15}$ $0.28^{+0.15}_{-0.16}$	$0 . 94_{- 0.19}^{+ 0.08}$ $0.94^{+0.08}_{-0.19}$	0.35 ± 0.09	$0 . 59_{- 0.12}^{+ 0.13}$ $0.59^{+0.13}_{-0.12}$
E_fold [keV]	$6 . 50_{- 0.18}^{+ 0.20}$ $6.50^{+0.20}_{-0.18}$	$7 . 0_{- 1.7}^{+ 0.5}$ $7.0^{+0.5}_{-1.7}$	$6 . 1_{- 0.7}^{+ 0.4}$ $6.1^{+0.4}_{-0.7}$	$6 . 39_{- 0.29}^{+ 0.38}$ $6.39^{+0.38}_{-0.29}$
E_cutoff [keV]	$14 . 2_{- 2.6}^{+ 2.5}$ $14.2^{+2.5}_{-2.6}$	$22 . 2_{- 2.2}^{+ 10.7}$ $22.2^{+10.7}_{-2.2}$	$20 . 1_{- 2.9}^{+ 5.1}$ $20.1^{+5.1}_{-2.9}$	$16 . 8_{- 1.7}^{+ 2.1}$ $16.8^{+2.1}_{-1.7}$
N_BB^(b)	$1 . 19_{- 0.24}^{+ 0.30}$ $1.19^{+0.30}_{-0.24}$	$8_{- 5}^{+ 93}$ $8^{+93}_{-5}$	$67_{- 29}^{+ 34}$ $67^{+34}_{-29}$	$1 . 7_{- 0.8}^{+ 1.5}$ $1.7^{+1.5}_{-0.8}$
T_BB [keV]	$0 . 439_{- 0.033}^{+ 0.028}$ $0.439^{+0.028}_{-0.033}$	$0 . 25_{- 0.06}^{+ 0.04}$ $0.25^{+0.04}_{-0.06}$	$0 . 264_{- 0.016}^{+ 0.022}$ $0.264^{+0.022}_{-0.016}$	$0 . 341_{- 0.030}^{+ 0.050}$ $0.341^{+0.050}_{-0.030}$
A_Fe Kα [10⁻³ ph s⁻¹ cm⁻²]	9.78 ± 0.12	$6 . 2_{- 0.4}^{+ 0.7}$ $6.2^{+0.7}_{-0.4}$	10.32 ± 0.19	$12 . 4_{- 0.6}^{+ 0.4}$ $12.4^{+0.4}_{-0.6}$
A_Fe Kβ [10⁻³ ph s⁻¹ cm⁻²]	0.84 ± 0.10	$0 . 62_{- 0.15}^{+ 0.17}$ $0.62^{+0.17}_{-0.15}$	0.96 ± 0.14	$1 . 41_{- 0.29}^{+ 0.20}$ $1.41^{+0.20}_{-0.29}$
A_SE [10⁻³ ph s⁻¹ cm⁻²]	$8 . 0_{- 1.2}^{+ 1.0}$ $8.0^{+1.0}_{-1.2}$	$2 . 0_{- 1.0}^{+ 2.9}$ $2.0^{+2.9}_{-1.0}$	$6 . 4_{- 0.8}^{+ 0.7}$ $6.4^{+0.7}_{-0.8}$	$5 . 8_{- 2.3}^{+ 1.9}$ $5.8^{+1.9}_{-2.3}$
E_SE [keV]	6.289 ± 0.021	$6 . 16_{- 0.13}^{+ 0.10}$ $6.16^{+0.10}_{-0.13}$	6.310 ± 0.027	$6 . 28_{- 0.06}^{+ 0.05}$ $6.28^{+0.05}_{-0.06}$
σ_SE [keV]	$0 . 61_{- 0.06}^{+ 0.05}$ $0.61^{+0.05}_{-0.06}$	$0 . 23_{- 0.14}^{+ 0.20}$ $0.23^{+0.20}_{-0.14}$	$0 . 51_{- 0.04}^{+ 0.05}$ $0.51^{+0.05}_{-0.04}$	$0 . 42_{- 0.17}^{+ 0.13}$ $0.42^{+0.13}_{-0.17}$
E_CRSF1 [keV]	$37 . 4_{- 1.0}^{+ 1.1}$ $37.4^{+1.1}_{-1.0}$	$37 . 9_{- 1.5}^{+ 1.8}$ $37.9^{+1.8}_{-1.5}$	$38 . 0_{- 2.2}^{+ 1.4}$ $38.0^{+1.4}_{-2.2}$	$37 . 3_{- 1.5}^{+ 1.7}$ $37.3^{+1.7}_{-1.5}$
σ_CRSF1 [keV]	$6 . 6_{- 0.9}^{+ 1.3}$ $6.6^{+1.3}_{-0.9}$	$7 . 3_{- 1.9}^{+ 4.2}$ $7.3^{+4.2}_{-1.9}$	$10 . 0_{- 2.5}^{+ 3.1}$ $10.0^{+3.1}_{-2.5}$	$6 . 9_{- 1.5}^{+ 2.2}$ $6.9^{+2.2}_{-1.5}$
d_CRSF1 [keV]	$5 . 5_{- 1.5}^{+ 2.4}$ $5.5^{+2.4}_{-1.5}$	$5 . 2_{- 2.6}^{+ 24.9}$ $5.2^{+24.9}_{-2.6}$	$14_{- 8}^{+ 17}$ $14^{+17}_{-8}$	$5 . 8_{- 2.7}^{+ 5.3}$ $5.8^{+5.3}_{-2.7}$
E_CRSF2 [keV]	$51 . 5_{- 1.0}^{+ 1.1}$ $51.5^{+1.1}_{-1.0}$	$50 . 8_{- 1.0}^{+ 1.3}$ $50.8^{+1.3}_{-1.0}$	$52 . 5_{- 1.6}^{+ 2.1}$ $52.5^{+2.1}_{-1.6}$	$51 . 3_{- 2.4}^{+ 2.3}$ $51.3^{+2.3}_{-2.4}$
σ_CRSF2 [keV]	$5 . 1_{- 0.8}^{+ 1.0}$ $5.1^{+1.0}_{-0.8}$	$3 . 6_{- 1.0}^{+ 1.5}$ $3.6^{+1.5}_{-1.0}$	$5 . 0_{- 1.2}^{+ 1.8}$ $5.0^{+1.8}_{-1.2}$	$4 . 9_{- 1.6}^{+ 1.9}$ $4.9^{+1.9}_{-1.6}$
d_CRSF2 [keV]	$7 . 7_{- 2.2}^{+ 3.2}$ $7.7^{+3.2}_{-2.2}$	$5 . 2_{- 2.0}^{+ 3.8}$ $5.2^{+3.8}_{-2.0}$	$6 . 9_{- 3.0}^{+ 6.4}$ $6.9^{+6.4}_{-3.0}$	$6_{- 4}^{+ 6}$ $6^{+6}_{-4}$
C_FPMB	1.0035 ± 0.0011	1.0006 ± 0.0023	1.0030 ± 0.0020	1.0036 ± 0.0017
g_FPMA [eV]	−32.2 ± 2.0	$- 18_{- 14}^{+ 8}$ $-18^{+8}_{-14}$	−32.1 ± 2.9	$- 28_{- 5}^{+ 7}$ $-28^{+7}_{-5}$
g_FPMB [eV]	−61.2 ± 2.0	$- 48_{- 14}^{+ 8}$ $-48^{+8}_{-14}$	−59.1 ± 2.9	$- 59_{- 5}^{+ 7}$ $-59^{+7}_{-5}$

ℒ₃₇^(c)	$2 . 83_{- 0.13}^{+ 0.14}$ $2.83^{+0.14}_{-0.13}$	$1 . 69_{- 0.17}^{+ 0.11}$ $1.69^{+0.11}_{-0.17}$	$2 . 55_{- 0.10}^{+ 0.13}$ $2.55^{+0.13}_{-0.10}$	$4 . 06_{- 0.21}^{+ 0.38}$ $4.06^{+0.38}_{-0.21}$
χ²/d.o.f.	720/477	445/437	588/445	494/451
$χ_{red}^{2}$ $\chi^2_\mathrm{red}$	1.51	1.02	1.32	1.10

Notes. We show the parameters of the fit to the whole observation and the three time segments.

^(a)

Unabsorbed flux of the continuum and blackbody in the energy range of 5–50 keV.

^(b)

Relative norm of the blackbody component with respect to the powerlaw component.

^(c)

Luminosity in units of 10³⁷erg s⁻¹ in the energy range of 5–50 keV and observer’s frame.

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