Table 4.
Best-fit parameters of GX 5−1 spectral model from NICER, NuSTAR, and IBIS/ISGRI data simultaneous to IXPE observation.
| Components | Parameters | Obs. 1 | Obs. 2 |
|---|---|---|---|
| edge | E (keV) | 1.82148 (frozen) | |
| τ |
 |
0.152 ± 0.017 | |
| edge | E (keV) | 1.95197 (frozen) | |
| τ | 0.051 ± 0.016 | 0.484 ± 0.016 | |
| edge | E (keV) | 2.28003 (frozen) | |
| τ | 0.037 ± 0.014 | 0.025 ± 0.014 | |
| edge | E (keV) | 2.44444 (frozen) | |
| τ | 0.050 ± 0.013 | 0.038 ± 0.013 | |
| edge | E (keV) | 3.16139 (frozen) | |
| τ |
 |
0.012 ± 0.007 | |
| Continuum paramters | |||
| tbabs | NH (1022 cm−2) |
 |
4.88 ± 0.04 |
| diskbb | kT (keV) | 0.95 ± 0.07 | 1.20 ± 0.03 |
 (km) (a) |
 |
 |
|
| thcomp | Γ |
 |
< 2.1 |
| kTe (keV) |
 |
 |
|
| f |
 |
 |
|
| bbodyrad | kTbb (keV) |
 |
 |
| Rbb (km) (a) |
 |
 |
|
| expabs | Ecut (keV) | [=kTbb] | – |
| powerlaw | Γ |
 |
– |
| norm |
 |
– | |
| Cross-calibration constants | |||
| const | CNICER | 1.107 ± 0.003 | 1.034 ± 0.004 |
| CNuSTAR,FPMA | 1 (frozen) | ||
| CNuSTAR,FPMB | 1.0136 ± 0.0013 | 0.9908 ± 0.0014 | |
| CIBIS/ISGRI | 0.66 ± 0.08 | 1.29 ± 0.03 | |
| χ2/d.o.f. | 421/451 | 338/365 | |
| τthcomp(b) |
 |
> 10.0 | |
| f2−8 keV(c) | 2.3 | 2.4 | |
| f2−5 keV(c) | 1.5 | 1.7 | |
| f5−8 keV(c) | 0.8 | 0.7 | |
| f(thcomp∗bbodyrad)/f2−8 keV | 61% | 33% | |
Notes. The errors are at 90% confidence level. The edges reported in the top section of the table refer only to the NICER energy spectrum.
Radii are estimated assuming the distance to the source of 7.6 kpc (see Sect. 3.5).
The optical depth τthcomp comes from Eq. (14) in Zdziarski et al. (2020).
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