Characteristics of the high-frequency humps in the black hole X-ray binary Swift J1727.8–1613

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Volume 707 (March 2026)

A&A, 707 (2026) A33

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Table A.3.

Best-fit spectral parameters to the NuSTAR spectrum (ObsID: 80902333004) of Swift J1727.8–1613 with the model Constant*Tbabs(diskbb+relxill+cutoffpl).

Component	Parameter	Value
TBabs	$N_{H} (10^{20} {cm}^{- 2})$ $Mathematical equation: $ N_{\mathrm{H}}\ (10^{20}\ \rm cm^{-2}) $$	[0.3]

diskbb	kT_in (keV)	0.29 ± 0.03
	N_disk (10⁶)	$4 . 2_{- 2.6}^{+ 10.3}$ $Mathematical equation: $ 4.2_{-2.6}^{+10.3} $$

relxill	α₁, α₂	[3]
	a_*	[0.2]
	R_in (R_ISCO)	$1 . 7_{- 0.5}^{+ 1.1}$ $Mathematical equation: $ 1.7_{-0.5}^{+1.1} $$
	i (°)	$30_{- 6}^{+ 3}$ $Mathematical equation: $ 30_{-6}^{+3} $$
	Γ₁	$1 . 95_{- 0.07}^{+ 0.10}$ $Mathematical equation: $ 1.95_{-0.07}^{+0.10} $$
	E_cut (keV)	$72_{- 17}^{+ 54}$ $Mathematical equation: $ 72_{-17}^{+54} $$
	log ξ (log [erg cm s⁻¹])	$3 . 41_{- 0.16}^{+ 0.26}$ $Mathematical equation: $ 3.41_{-0.16}^{+0.26} $$
	A_Fe	$0 . 9_{- 0.3}^{+ 1.4}$ $Mathematical equation: $ 0.9_{-0.3}^{+1.4} $$
	refl_frac	$0 . 086_{- 0.018}^{+ 0.033}$ $Mathematical equation: $ 0.086_{-0.018}^{+0.033} $$
	N_relxill	$0 . 31_{- 0.04}^{+ 0.03}$ $Mathematical equation: $ 0.31_{-0.04}^{+0.03} $$

cutoffpl	Γ₂	$1 . 16_{- 0.07}^{+ 0.08}$ $Mathematical equation: $ 1.16_{-0.07}^{+0.08} $$
	$E_{cut} (keV)$ $Mathematical equation: $ E_{\mathrm{cut}}\ (\rm keV) $$	$11 . 7_{- 0.6}^{+ 1.2}$ $Mathematical equation: $ 11.7_{-0.6}^{+1.2} $$
	N_cutoffpl	$9 . 2_{- 1.3}^{+ 2.6}$ $Mathematical equation: $ 9.2_{-1.3}^{+2.6} $$

	χ²/d.o.f	2285.23/2183

Notes. Uncertainties are given at the 90 percent confidence level. The parameters N_H, a_* and emissivity indices (α₁, α₂) have been fixed during the fitting.

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