Discovery of energy-dependent phase variations in the polarization angle of Cen X-3

Open Access

Table 5.

Best-fit parameters for the phase-resolved IXPE (2–8 keV), NICER (0.7–10 keV), and NuSTAR (4–79 keV) spectra.

	Phase

Parameter	0.000–0.143	0.143–0.286	0.286–0.429	0.429–0.572	0.572–0.715	0.715–0.858	0.858–1.000
N_H (10²² cm⁻²)	3.7 ± 0.1	5.4 ± 0.2	3.30 ± 0.08	2.51 ± 0.07	2.37 ± 0.06	$3 . 13_{- 0.08}^{+ 0.09}$ $Mathematical equation: $ 3.13^{+0.09}_{-0.08} $$	3.2 ± 0.1
Covering fraction	0.51 ± 0.01	0.38 ± 0.01	0.625 ± 0.006	0.580 ± 0.006	0.596 ± 0.006	0.589 ± 0.006	0.57 ± 0.01
E_cut (keV)	14.3 ± 0.2	13.2 ± 0.1	13.4 ± 0.1	12.1 ± 0.1	13.44 ± 0.06	$13 . 0_{- 0.1}^{+ 0.2}$ $Mathematical equation: $ 13.0^{+0.2}_{-0.1} $$	11.0 ± 0.2
E_fold (keV)	6.6 ± 0.1	6.68 ± 0.08	$6 . 52_{- 0.06}^{+ 0.07}$ $Mathematical equation: $ 6.52^{+0.07}_{-0.06} $$	8.07 ± 0.09	9.6 ± 0.1	8.5 ± 0.1	$7 . 04_{- 0.09}^{+ 0.08}$ $Mathematical equation: $ 7.04^{+0.08}_{-0.09} $$
Γ	1.39 ± 0.02	1.24 ± 0.01	1.24 ± 0.01	$1 . 052_{- 0.008}^{+ 0.007}$ $Mathematical equation: $ 1.052^{+0.007}_{-0.008} $$	1.158 ± 0.004	1.340 ± 0.009	1.35 ± 0.02
Power-law norm	$0 . 58_{- 0.01}^{+ 0.02}$ $Mathematical equation: $ 0.58^{+0.02}_{-0.01} $$	0.40 ± 0.01	1.09 ± 0.02	0.89 ± 0.01	0.648 ± 0.005	0.592 ± 0.008	0.60 ± 0.02
E_line (keV, Gauss)	6.50 ± 0.01	6.526 ± 0.009	6.51 ± 0.02	6.49 ± 0.02	6.49 ± 0.01	6.49 ± 0.01	6.46 ± 0.01
σ (keV, Gauss)	0.35 ± 0.02	0.34 ± 0.01	0.23 ± 0.03	0.23 ± 0.02	0.17 ± 0.02	0.25 ± 0.02	0.30 ± 0.02
Gauss norm (10⁻³)	$10 . 4_{- 0.4}^{+ 0.5}$ $Mathematical equation: $ 10.4^{+0.5}_{-0.4} $$	11.2 ± 0.3	6.8 ± 0.5	7.4 ± 0.5	4.6 ± 0.3	6.3 ± 0.3	7.5 ± 0.4
EW (keV)	0.242 ± 0.008	0.285 ± 0.008	0.064 ± 0.004	0.060 ± 0.004	0.062 ± 0.004	$0 . 130_{- 0.005}^{+ 0.006}$ $Mathematical equation: $ 0.130^{+0.006}_{-0.005} $$	0.154 ± 0.007
E_cyc (keV)	–	–	–	29.3 ± 0.3	28.7 ± 0.2	27.9 ± 0.4	–
σ_cyc (keV)	–	–	–	5.6 ± 0.3	4.6 ± 0.2	5.5 ± 0.4	–
Depth_cyc	–	–	–	7.5 ± 0.7	5.8 ± 0.4	$6 . 5_{- 0.8}^{+ 0.9}$ $Mathematical equation: $ 6.5^{+0.9}_{-0.8} $$	–
Constant (NICER)	1.00^fixed	1.00^fixed	1.00^fixed	1.00^fixed	1.00^fixed	1.00^fixed	1.00^fixed
Constant (FPMA)	1.152 ± 0.005	1.400 ± 0.006	0.999 ± 0.003	0.870 ± 0.002	1.040 ± 0.003	1.230 ± 0.005	1.214 ± 0.005
Constant (FPMB)	1.159 ± 0.005	1.369 ± 0.006	1.001 ± 0.003	0.886 ± 0.002	1.056 ± 0.003	1.231 ± 0.005	1.218 ± 0.005
Constant (DU1)	0.837 ± 0.004	1.224 ± 0.006	1.039 ± 0.003	1.090 ± 0.003	1.075 ± 0.003	1.251 ± 0.005	1.115 ± 0.005
Constant (DU2)	0.875 ± 0.005	1.220 ± 0.006	1.040 ± 0.003	1.134 ± 0.003	1.133 ± 0.004	1.292 ± 0.006	1.158 ± 0.005
Constant (DU3)	0.835 ± 0.005	1.233 ± 0.006	1.042 ± 0.003	1.086 ± 0.003	1.081 ± 0.004	1.256 ± 0.005	1.103 ± 0.005
χ²/d.o.f.	2659.9/2361	2750.0/2391	3007.2/2616	2953.0/2680	2907.1/2670	2601.7/2419	2509.3/2357

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