Discovery of a strong rotation of the X-ray polarization angle in the galactic burster GX 13+1

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Table 3.

Best-fit parameters of GX 13+1 spectrum from XMM–Newton data.

Parameter		Value
`tbabs`	N_H (10²² cm⁻²)	$5 . 94_{- 0.07}^{+ 0.06}$ $5.94^{+0.06}_{-0.07}$
`diskbb`	kT (keV)	$1 . 39_{- 0.06}^{+ 0.12}$ $1.39^{+0.12}_{-0.06}$
	norm	$130_{- 30}^{+ 20}$ $130^{+20}_{-30}$
`bbodyrad`	kT (keV)	$2 . 0_{- 0.1}^{+ 0.3}$ $2.0^{+0.3}_{-0.1}$
	norm	20.08 ± 0.03
	R_bb (km)	3.13 ± 0.02
`gaussian`	E (keV)	6.6 (frozen)
	σ (keV)	0.8 (frozen)
	norm	$0 . 0048_{- 0.0007}^{+ 0.0009}$ $0.0048^{+0.0009}_{-0.0007}$
`gabs`	E (keV)	$8 . 476_{- 0.009}^{+ 0.005}$ $8.476^{+0.005}_{-0.009}$
	σ (keV)	0.05 (frozen)
	Depth (keV)	0.067 ± 0.004
`gabs`	E (keV)	8.10 ± 0.01
	σ (keV)	0.05 (frozen)
	Depth (keV)	0.040 ± 0.003
`gabs`	E (keV)	$7 . 180_{- 0.004}^{+ 0.006}$ $7.180^{+0.006}_{-0.004}$
	σ (keV)	0.05 (frozen)
	Depth (keV)	0.040 ± 0.001
`gabs`	E (keV)	6.90 ± 0.01
	σ (keV)	0.050 (frozen)
	Depth (keV)	$0 . 0150_{- 0.0013}^{+ 0.0017}$ $0.0150^{+0.0017}_{-0.0013}$
`edge`	E (keV)	8.83 (frozen)
	τ	0.20 ± 0.01
`edge`	E (keV)	9.28 (frozen)
	τ	0.08 ± 0.01

	χ²/d.o.f.	1504/1483

Notes. The errors are at 68% CL. R_bb is calculated from the normalization of the bbodyrad component, assuming a distance to the source of 7 kpc.

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