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Table 4.

Best-fit parameters combining PN1, PN2 and NICER spectra.

Model I
 Model L
 Model M
Components Parameters NICER PN1 PN2 NICER PN1 PN2 NICER PN1 PN2
const [1] 0.85 ± 0.02 0.686 ± 0.015 [1] 0.86 ± 0.02 0.688 ± 0.015 [1] 0.86 ± 0.02 0.685 ± 0.015
edge E (keV) [2.1] [2.1] [2.1]
τ 0.09 ± 0.02 [0] [0] 0.08 ± 0.02 [0] [0] 0.08 ± 0.02 [0] [0]
gabs E0 (keV) 0.728 ± 0.005
σ0 (keV) 0.097 ± 0.008 0.075 ± 0.013
Strength (×10−2) 5.9 ± 0.9
TBabs NH 6.2 ± 0.7 6.4 ± 0.7 –
TBfeo NH – – 6.3 ± 0.7
O – – 2.0 ± 0.7
Fe – – < 3.7
edge E (keV) – [0.56] –
τ – 0.18 ± 0.08 –
edge E (keV) – [0.71] –
τ – < 0.09 –
bbodyrad kTbb (keV) 0.182 ± 0.004 0.185 ± 0.004 0.184 ± 0.004
Nbb () 2000 ± 300 3000 ± 400 (2000 ± 300) 2000 ± 300 3000 ± 400 (2000 ± 300)
Comptb kT0 (keV) 0.90 ± 0.04 0.81 ± 0.04 0.80 ± 0.03 0.91 ± 0.04 0.82 ± 0.04 0.81 ± 0.03 0.90 ± 0.04 0.81 ± 0.04 0.80 ± 0.03
kTe (keV) () 2.67 ± 0.05 () 2.69 ± 0.05 () 2.68 ± 0.05
α 0.40 ± 0.03 0.32 ± 0.02 0.287 ± 0.013 0.41 ± 0.03 0.33 ± 0.02 0.291 ± 0.015 0.40 ± 0.03 0.32 ± 0.02 0.288 ± 0.013
NComptb (×10−3) 4.4 ± 0.2 4.4 ± 0.2 4.4 ± 0.2
Gauss E (keV) [1.182] [1.182] [1.182]
σ (eV) [5] [5] [5]
I (×10−5) [0] 7 ± 2 5 ± 2 [0] 6 ± 3 5 ± 2 [0] 6 ± 3 5 ± 2
Gauss E (keV) [1.343] [1.343] [1.343]
σ (eV) [5] [5] [5]
I (×10−5) [0] 11 ± 2 5 ± 2 [0] 10 ± 2 4 ± 2 [0] 10 ± 2 4 ± 2
Gauss E (keV) [1.89] [1.89] [1.89]
σ (eV) [0] [0] [0]
I (×10−5) [0] 7 ± 2 [0] [0] 7 ± 2 [0] [0] 7 ± 2 [0]
Gauss E (keV) 2.23 ± 0.02 2.23 ± 0.02 2.23 ± 0.02
σ (eV) [0] [0] [0]
I (×10−4) [0] [0] −0.9 ± 0.2 [0] [0] −0.9 ± 0.2 [0] [0] −0.9 ± 0.2
Gauss E (keV) 6.31 ± 0.08 6.31 ± 0.08 6.31 ± 0.08
σ (eV) 440 ± 70 440 ± 70 440 ± 70
I (×10−4) 3.8 ± 0.7 3.9 ± 0.8 3.9 ± 0.8
Gauss E (keV) 6.505 ± 0.008 () 6.505 ± 0.008 () 6.505 ± 0.008 ()
Fe I σ (eV) [70] [70] [70]
I (×10−4) 3.5 ± 0.3 5.1 ± 0.4 (3.5 ± 0.3) 3.5 ± 0.3 5.0 ± 0.4 (3.5 ± 0.3) 3.5 ± 0.3 5.1 ± 0.4 (3.5 ± 0.3)
Gauss E (keV) 7.056 ± 0.015 () () 7.054 ± 0.015 ()
Fe XXVI σ (eV) [70] [70] [70]
I (×10−4) 1.9 ± 0.3 2.9 ± 0.3 (1.9 ± 0.3) 1.9 ± 0.3 2.9 ± 0.3 (1.9 ± 0.3) 1.9 ± 0.3 2.9 ± 0.3 (1.9 ± 0.3)
χ2/d.o.f. 494/356 484/354 489/354

Notes. The errors are at 90% confidence level. The values in square brackets weare kept fixed during the fit. The values in round brackets were constrained to the values of the NICER spectrum. The NH value is in units of 1020 cm−2.

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