Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8–1613 along the hard to hard-intermediate state transition using NICER

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Table 1.

Representative best-fitting spectral and corona parameters for ObsID 6203980105 of Swift J1727.8–1613 using the single and dual corona model.

Component	Parameter	M1⁽¹⁾	M2⁽²⁾
TBfeo	N_H(10²² cm⁻²)	[0.28]^a	[0.28]^a
diskbb	kT_in (keV)	0.351±0.003	0.352±0.003
	N_disk (10⁴)	15.8±0.2	15.7±0.4
nthComp	Γ	1.742±0.002	1.742±0.003
	kT_e (keV)	[40]^a	[40]^a
	N_nthComp	$34 . 4_{- 0.2}^{+ 0.3}$ $34.4^{+0.3}_{-0.2}$	34.4±0.3
gaussian	LineE (keV)	[6.4]^a	[6.4]^a
	σ (keV)	[1.0]^a	[1.0]^a
	Strength (10⁻¹)	[0.2]^a	[0.2]^a
vkompthdk/vkdualdk	kT_s / kT_{s, 1} (keV)	0.057±0.001	$0 . 286_{- 0.055}^{+ 0.020}$ $0.286^{+0.020}_{-0.055}$
	L / L₁ (10³ km)	31.4±0.7	$6 . 1_{- 1.3}^{+ 1.5}$ $6.1^{+1.5}_{-1.3}$
	L₂ (10³ km)	−	$7 . 5_{- 1.7}^{+ 2.1}$ $7.5^{+2.1}_{-1.7}$
	η / η₁	$0 . 60_{- 0.02}^{+ 0.03}$ $0.60^{+0.03}_{-0.02}$	$0 . 28_{- 0.04}^{+ 0.02}$ $0.28^{+0.02}_{-0.04}$
	η₂	−	0.32±0.01
	ϕ (rad)	−	3.11±0.01
	reflag (10⁻²)	3.1±0.2	8.2±0.5
	η_int/η_{int, 1}	0.013±0.001	$0 . 014_{- 0.002}^{+ 0.003}$ $0.014^{+0.003}_{-0.002}$
	η_{int, 2}	−	0.017±0.001

	χ² (d.o.f.)	415.2 (255)	254.2 (251)

Notes. Uncertainties are given at the 1σ level.

⁽¹⁾

In Model M1, the RMS spectra are fitted with vkompthdk*dilution, while the lag spectra are fitted with vkompthdk.

⁽²⁾

In Model M2, the RMS spectra are fitted with vkdualdk*dilution, while the lag spectra are fitted with vkdualdk.

^(a)

The parameters N_H and LineE are frozen.

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