Recovery of the X-ray polarisation of Swift J1727.8−1613 after the soft-to-hard spectral transition

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Volume 686 (June 2024)

A&A, 686 (2024) L12

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Table A.1.

Best-fit spectral parameter values of the joint IXPE spectro-polarimetric fit in XSPEC with Model (1) for the data restricted to 0–100, 100–250, and 250–384 ks after the start of observation 8.

Component	Parameter [unit]	Interval
		0–100 ks	100–250 ks	250–384 ks
`tbabs`	N_H [10²² cm⁻²]	0.24 (frozen)	0.24 (frozen)	0.24 (frozen)

`diskbb`	kT_in [keV]	0.38 ± 0.07	0.31 ± 0.06	$0 . 24_{- 0.09}^{+ 0.12}$ $0.24^{+0.12}_{-0.09}$
	norm [10²]	$2_{- 1}^{+ 5}$ $2^{+5}_{-1}$	$10_{- 7}^{+ 39}$ $10^{+39}_{-7}$	$28_{- 25}^{+ 455}$ $28^{+455}_{-25}$

`powerlaw`	Γ	$1 . 80_{- 0.04}^{+ 0.03}$ $1.80^{+0.03}_{-0.04}$	$1 . 75_{- 0.03}^{+ 0.02}$ $1.75^{+0.02}_{-0.03}$	1.77 ± 0.02
	norm	$0 . 075_{- 0.005}^{+ 0.004}$ $0.075^{+0.004}_{-0.005}$	$0 . 093_{- 0.004}^{+ 0.003}$ $0.093^{+0.003}_{-0.004}$	$0 . 084_{- 0.003}^{+ 0.002}$ $0.084^{+0.002}_{-0.003}$

`const`	factor DU 1	1.0 (frozen)	1.0 (frozen)	1.0 (frozen)
	factor DU 2	1.028 ± 0.005	1.031 ± 0.004	1.048 ± 0.005
	factor DU 3	1.014 ± 0.005	1.020 ± 0.004	1.032 ± 0.005

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