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

Open Access

Table 2.

Phase-averaged spectro-polarimetric results.

Model	Parameter	Value	Value	Value
`tbabs`	N_H (10²² cm⁻²)	2.45 ± 0.04	2.45 ± 0.04	2.45 ± 0.04
`polconst`	PD (%)	5.6 ± 0.3	–	–
	PA (deg)	49.9 ± 1.4	–	–
`pollin`	PD (%)	–	6.5 ± 0.7	5.7 ± 0.3
	PD slope (% keV⁻¹)	–	−0.3 ± 0.2	0^fixed
	PA (deg)	–	61 ± 4	61 ± 4
	PA slope (deg keV⁻¹)	–	−3.9 ± 1.2	−3.9 ± 1.2
`powerlaw`	Γ	1.17 ± 0.01	1.17 ± 0.01	1.17 ± 0.01
	Normalization	0.64 ± 0.01	0.64 ± 0.01	0.64 ± 0.01
`gauss`	Line energy (keV)	$6 . 75_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 6.75^{+0.05}_{-0.04} $$	$6 . 75_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 6.75^{+0.05}_{-0.04} $$	$6 . 75_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 6.75^{+0.05}_{-0.04} $$
	Sigma (keV)	0.33 ± 0.08	0.33 ± 0.08	0.33 ± 0.08
	Normalization	0.010 ± 0.001	0.010 ± 0.001	0.010 ± 0.001

`constant`	DU1	1^fixed	1^fixed	1^fixed
	DU2	1.014 ± 0.002	1.014 ± 0.002	1.014 ± 0.002
	DU3	0.986 ± 0.002	0.986 ± 0.002	0.986 ± 0.002

	χ²/d.o.f.	595.8/608	583.4/606	585.0/607

Notes. Spectral-polarimetric fits were performed using the models constant*tbabs*polconst*(powerlaw+gauss) and constant*tbabs*pollin*(powerlaw+gauss). The three value columns show the best-fit parameters obtained with the polconst model, the pollin model, and the pollin model with the PD slope fixed to zero, respectively.

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