Table 1
Best-fit parameters obtained from fitting to the survey-averaged energy spectrum of Her X-1 from the first and the second SRG all-sky surveys.
| Parameters | First survey | Second survey |
|---|---|---|
| NH, cm−2 | 1.54 × 1020 (*) | 1.54 × 1020 (*) |
| kTbb, eV |  |
106 ± 9 |
| Rbb (a), km |  |
 |
| Γpow |  |
 |
| Kpow (b), | 2.22 ± 0.25 × 10−3 |  |
| ph keV−1 cm−2 s−1 | ||
| EMphotemis (c), cm−3 | < 8 × 1056 |  |
| ξ | 1000(*) | 1000(*) |
| C-stat / d.o.f. | 277 / 237 | 290 / 298 |
Notes. Errors are quoted at the 90% confidence level. We use typical interstellar abundances by Wilms et al. (2000) for the TBABS component, while for the PHOTEMIS component elemental abundances are fixed to the solar values relative to Grevesse et al. (1996). The parameters Rbb and EMphotemis are calculated assuming the distance of 6.6 kpc to Her X-1 (Reynolds et al. 1997). (a) The size of the thermal region derived from the thermal blackbody component normalization:
.
(b) Normalization of the power-law component at 1 keV. (c)The emission measure of the gas obtained from the PHOTEMIS best-fit normalization: EM = 10104πD2 × normphotemis. (*) Parameter is fixed during the fit.
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