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Table 1.

Best-fit values of the NICER + NuSTAR broadband spectrum.

Component Parameter Model 1B Model 2 Model 3
TBabs NH (× 1022 cm−2) 0.84 0.03 + 0.03 $ {}^{+0.03}_{-0.03} $ 0.84 0.02 + 0.02 $ {}^{+0.02}_{-0.02} $ 0.90 0.01 + 0.04 $ {}^{+0.04}_{-0.01} $

gabs E (keV) 0.97 0.97 0.97
σ (keV) 0.06 0.04 + 0.03 $ {}^{+0.03}_{-0.04} $ 0.05 0.04 + 0.04 $ {}^{+0.04}_{-0.04} $ 0.07 0.04 + 0.04 $ {}^{+0.04}_{-0.04} $
Strength (keV) 0.015 0.007 + 0.009 $ {}^{+0.009}_{-0.007} $ 0.015 0.007 + 0.008 $ {}^{+0.008}_{-0.007} $ 0.021 0.009 + 0.011 $ {}^{+0.011}_{-0.009} $

diskbb kTdisc (keV) 0.38 0.03 + 0.03 $ {}^{+0.03}_{-0.03} $ 0.37 0.02 + 0.02 $ {}^{+0.02}_{-0.02} $ 0.34 0.04 + 0.03 $ {}^{+0.03}_{-0.04} $
Kdisc 163 37 + 66 $ {}^{+66}_{-37} $ 345 80 + 122 $ {}^{+122}_{-80} $ 177 59 + 226 $ {}^{+226}_{-59} $

nthComp Γ 1.79 0.01 + 0.01 $ {}^{+0.01}_{-0.01} $

simpl Scattered frac. 0 . 45 0.06 + 0.02 $ 0.45^{+0.02}_{-0.06} $
Γ 1.79 0.02 + 0.01 $ {}^{+0.01}_{-0.02} $

smedge Eedge (keV) 7.5 0.5 + 0.5 $ {}^{+0.5}_{-0.5} $ ≲7.8
Absorption depth 0.26 0.04 + 0.04 $ {}^{+0.04}_{-0.04} $ 0.25 0.04 + 0.04 $ {}^{+0.04}_{-0.04} $
Index for photo-electric cross-section –2.67 –2.67
Smearing width (keV) 2 2

relxillcp Γ 1.72 0.01 + 0.01 $ {}^{+0.01}_{-0.01} $
Rin (Rg) <11.4
AFe (A) 1
log Xi 3.69 0.02 + 0.03 $ {}^{+0.03}_{-0.02} $
log (ne/cm−3) 19
Refl. frac. >3

Observed Flux (× 10−10 erg cm−2 s−1) 3.29 0.03 + 0.13 $ {}^{+0.13}_{-0.03} $ 3.31 0.34 + 0.14 $ {}^{+0.14}_{-0.34} $ 3.21 0.28 + 0.05 $ {}^{+0.05}_{-0.28} $
Unabsorbed Flux (× 10−10 erg cm−2 s−1) 3.78 0.21 + 0.28 $ {}^{+0.28}_{-0.21} $ 4.10 0.11 + 0.13 $ {}^{+0.13}_{-0.11} $ 4.06 0.04 + 0.05 $ {}^{+0.05}_{-0.04} $
χ2 (d.o.f.) 435.02(405) 426.71(405) 442.69(404)

Notes. Fluxes are calculated in the 0.5–60 keV energy band. Models used are: Model 1B: TBabs × gabs × smedge(nthComp + diskbb), Model 2:TBabs × gabs × smedge × simpl × diskbb, Model 3: TBabs × gabs(diskbb + relxillCp).

Fixed parameter in the fit.

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