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Table 2.

Best-fitting model.

Parameter Value
Lines (ZGAUSS)
E1 (keV) 1.96 ± 0.02
N1 5.6 ± 0.8 × 10−5
E2 (keV) 2.42 ± 0.07
N2 3.5 ± 0.3 × 10−5
E3 (keV) 3 . 09 − 0.04 + 0.02 $ 3.09^{+0.02}_{-0.04} $
N3 0 . 55 − 0.17 + 0.19 × 10 − 5 $ 0.55^{+0.19}_{-0.17} \times 10^{-5} $
E4 (keV) 6 . 41 − 0.02 + 0.01 $ 6.41^{+0.01}_{-0.02} $
σ4 (eV) 76 ± 12
N4 7 . 4 − 0.6 + 0.5 × 10 − 5 $ 7.4^{+0.5}_{-0.6} \times 10^{-5} $
E5 (keV) 6.7(f)
N5 2.3 ± 0.4 × 10−5
E6 (keV) 6.966(f)
N6 1.1 ± 0.5 × 10−5
ULXs (POWERLAW)
Γ 1(f)
N 2.3 × 10−5(f)
Cold reflector (PEXRAV)
Γ 2(f)
N (1.97 ± 0.08)×10−2
P.D. (%) 20 ± 10
P.A. (deg) 102 ± 15
Warm reflector (POWERLAW)
Γ 3(f)
N 2 . 36 − 0.12 + 0.06 × 10 − 3 $ 2.36^{+0.06}_{-0.12} \times 10^{-3} $
P.D. (%) 16(f)
P.A. (deg) 97(f)
Cross-calibration constants
CDU1 − ACIS 0.68 ± 0.01
CDU2 − ACIS 0.64 ± 0.01
CDU3 − ACIS 0.60 ± 0.01
Observed flux
F2 − 8keV (4.32 ± 0.15)×10−12
χ2/d.o.f. 534/527

Notes. Best-fitting parameters (68 percent confidence level for one parameter of interest) of the joint Chandra and IXPE fit. Normalizations are in units of photons’ keV−1 cm−2 s−1, while the flux is in units of erg cm−2 s−1. (f) denotes a fixed parameter. The energies of the two lines, E5 and E6, are fixed at the values of the Fe XXV and Fe XXVI Kα lines. The width of all lines is fixed at zero, with the only exception being the neutral Fe Kα line.

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