A transition from mixed-fuel to pure-helium thermonuclear bursts in Terzan 5 X–3/Swift J174805.3–244637

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Volume 703 (November 2025)

A&A, 703 (2025) A254

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Table 2.

Best-fitted parameters of the pre-burst persistent spectra.

NICER	N_H	T_in	K_diskbb	kT_bb	K_bb	χ_ν² (d.o.f.)	F_per^(a)
(Obs. Id)	(10²² cm⁻²)	(keV)		(keV)			(10⁻⁹ erg s⁻¹ cm⁻²)
6203670101		0.75 ± 0.05	$159_{- 36}^{+ 45}$ $159_{-36}^{+45}$	1.79 ± 0.06	26 ± 3	1.02(107)	3.96 ± 0.03
6203670101		0.79 ± 0.07	$135_{- 35}^{+ 44}$ $135_{-35}^{+44}$	1.74 ± 0.07	28 ± 4	1.01(107)	3.99 ± 0.03
6203670101		0.85 ± 0.07	$120_{- 29}^{+ 36}$ $120_{-29}^{+36}$	1.82 ± 0.07	25 ± 4	1.16(109)	4.47 ± 0.03
6203670106	2.29 ± 0.03	0.99 ± 0.07	$188_{- 37}^{+ 43}$ $188_{-37}^{+43}$	1.72 ± 0.08	44 ± 9	1.11(118)	8.20 ± 0.03
6203670115		0.74 ± 0.03	$333_{- 52}^{+ 61}$ $333_{-52}^{+61}$	1.50 ± 0.05	35 ± 6	0.86(115)	4.26 ± 0.03
6203670119		0.60 ± 0.02	$326_{- 55}^{+ 67}$ $326_{-55}^{+67}$	1.43 ± 0.06	15 ± 2	0.96(104)	1.65 ± 0.03
6203670120		0.65 ± 0.03	$197_{- 37}^{+ 46}$ $197_{-37}^{+46}$	2.32 ± 0.26	3 ± 0.8	0.84(101)	1.73 ± 0.03

Notes.

^(a)

The unabsorbed bolometric persistent flux in 0.1 − 250 keV.

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