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Table 1.

Results of spectral fits to the X-ray spectra of the persistent emission.

Instrument NH/1020(a) kT Γ C/PG-stat χ2 d.o.f. Fobs/10−12(b) L/1036(c) (d)
(cm−2) (eV) (erg cm−2 s−1) (erg s−1) (km)
EPIC 11.3±1.9 142 1.42±0.03 1404 1405 5.83±0.12 2.63±0.07 74
NICER 11.7 129 1.41 880 1416 764 5.93 2.61 80
eROSITA 11.5 fix 44 1.81 89.3 94.5 132 4.06 1.75 4260
Swift/XRT 11.5 fix 1.64 86.8 106.6 120 5.2 2.3

Notes. Best-fit parameters for an absorbed two-component model consisting of disk-blackbody and power-law emission. Errors indicate 90% confidence ranges.


For the photo-electric absorption by gas along the line of sight, we used tbabs in XSPEC with interstellar abundances following Wilms et al. (2000) and atomic cross sections from Verner et al. (1996).


Observed flux in the 0.2–10.0 keV energy band.


Source-intrinsic luminosity corrected for absorption and assuming a distance of 55 kpc (0.2–10.0 keV).


Inner radius of the accretion disk with inclination angle θ.

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