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Table 6.
Best-fit parameters with reflection included in the energy spectrum model of GX 5−1 from NICER, NuSTAR, and INTEGRAL data simultaneous to IXPE observations.
| Components | Parameters | Obs. 1 | Obs. 2 |
|---|---|---|---|
| edge | E (keV) | 1.820 ± 0.013 | 1.818 ± 0.013 |
| τ | 0.15 ± 0.02 | 0.15 ± 0.02 | |
| edge | E (keV) | 1.952 (fixed) | |
| τ | 0.05 ± 0.02 | 0.05 ± 0.02 | |
| edge | E (keV) | 2.280 (fixed) | |
| τ | 0.034 ± 0.014 | 0.027 ± 0.013 | |
| edge | E (keV) | 2.444 (fixed) | |
| τ | 0.049 ± 0.013 | 0.038 ± 0.013 | |
| edge | E (keV) | 3.161 (fixed) | |
| τ | 0.021 ± 0.007 | 0.011 ± 0.007 | |
| tbabs | NH (1022 cm−2) | 4.80 ± 0.05 | 4.87 ± 0.05 |
| diskbb | kT (keV) | 1.21 ± 0.05 | 1.20 ± 0.03 |
 (km) (a) |
16 ± 1 | 19 ± 1 | |
| comptb | kT0 (keV) | 1.93 ± 0.13 | 1.71 ± 0.04 |
| α |
 |
< 1.16 | |
| kTe (keV) |
 |
 |
|
| log A | 8 (fixed) |
 |
|
| Ncomptb | 0.148 ± 0.003 | 0.123 ± 0.006 | |
| expabs | Ecut (keV) | [=kT0] | – |
| powerlaw | Γ | 2.4 (fixed) | – |
| norm | 0.17 ± 0.05 | – | |
| rdblur | betor | −2.5 (fixed) | |
| Rin (Rg) | 7 (fixed) | ||
| Rout (Rg) | 1000 (fixed) | ||
| incl. (deg) | 60 (fixed) | ||
| rfxconv | rel-refl | 0.3 (fixed) | |
| log ξ | 3.8 (fixed) | ||
| χ2/d.o.f. | 268/295 | 247/260 | |
Notes. The errors are at 90% confidence level.
(a)
Radii are estimated assuming the distance to the source of 7.6 kpc (see Sect. 3.5).
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