Table 5.
Model A parameters for GRS 1915+105, Cyg X–3 and V4641 Sgr.
| Model A: C1 × PHABS × SMEDGE × PCFABS × (XILLVERCP1/RELXILLCP + XILLVERCP2 + GAUSS) | |||||||
|---|---|---|---|---|---|---|---|
| GRS 1915+105 |
Cyg X–3 | V4641 Sgr |
|||||
| Epoch 1 | Epoch 2 | Epoch 3 | Epoch 1 | Epoch 2 | |||
| PHABS × SMEDGE × PCFABS | |||||||
| NH, 1 | 1022 cm−2 | 5.5 ± 0.1 | 5 ± 1 | 7.2 ± 0.4 | 8.2 |
6.2 ± 0.6 | 3.3 ± 0.5 |
| E | keV | 7.34 |
– | – | – | – | – |
| τ | 0.15 |
– | – | – | – | – | |
| σ | keV | 0.01 | – | – | – | – | – |
| NH, 2 | 1022 cm−2 | – | 41 ± 5 | 78 ± 7 | 44 ± 3 | – | – |
| fcov | – | 0.58 ± 0.04 | 0.57 ± 0.04 | 0.54 ± 0.02 | – | – | |
| XILLVERCP1/RELXILLCP | |||||||
| Norm | ×10−3 | 1.24 ± 0.04 | 2.2 ± 0.1 | 3.3 |
27 |
0.6 ± 0.1 | 0.47 ± 0.01 |
| θinc | deg | 70 | 70 | 70 | 59 ± 5 | 70 | 70 |
| Rin | 3.9 |
– | – | – | 27 |
21 |
|
| z | 0.124 |
0.010 ± 0.002 | 0.021 ± 0.005 | 0.003 | – | – | |
| Γ | 1.85 ± 0.01 | 1.58 ± 0.02 | 1.64 ± 0.03 | 2.39 |
2.17 |
1.46 ± 0.01 | |
| log ξ | 3.35 |
3.40 |
3.37 |
3.79 |
3.05 ± 0.02 | 2.80 |
|
| AFe | 1.2 ± 0.2 | 1.2 ± 0.2 | 2.3 ± 0.4 | < 0.56 | 1.8 ± 0.2 | 1.5 ± 0.1 | |
| kTe | keV | 400 | 15.6 ± 0.6 | 12.9 ± 0.4 | 33 |
>75 | 9.3 ± 0.1 |
| XILLVERCP2 | |||||||
| log ξ | – | 2.00 |
2.1 |
2.88 |
– | – | |
| Norm | ×10−3 | – | 2.0 ± 0.2 | 1.3 |
33 |
– | – |
| GAUSS | |||||||
| E | keV | 6.56 |
– | – | – | – | – |
| Norm | ×10−3 | −0.78 ± 0.05 | – | – | – | – | – |
| Constants (a) | |||||||
| C1 | 1.01 | 1.02 | 1.01 | 1.01 | – | – | |
| Fluxes (10−8 erg s−1 cm−2) | |||||||
| Abs. | 0.216 ± 0.005 | 0.155 ± 0.005 | 0.151 ± 0.008 | 0.59 ± 0.05 | 0.06 ± 0.01 | 0.10 ± 0.01 | |
| Unabs. | 0.237 ± 0.005 | 0.180 ± 0.005 | 0.20 ± 0.01 | 0.93 ± 0.08 | 0.07 ± 0.01 | 0.12 ± 0.01 | |
| XILLVERCP1/RELXILLCP | 100% | 65% | 88% | 58% | 100% | 100% | |
| XILLVERCP2 | – | 35% | 12% | 42% | – | – | |
| Luminosities (b) and Eddington ratio (c) (3–79 keV) | |||||||
| Abs. | 1038 erg s−1 | 0.19 |
0.14 |
0.13 |
0.4 |
0.03 ± 0.01 | 0.05 ± 0.01 |
| Unabs. | 1038 erg s−1 | 0.21 |
0.16 |
0.17 |
0.6 |
0.03 ± 0.01 | 0.05 |
| L/LEdd | 0.013 |
0.010 |
0.010 |
0.10 |
0.004 |
0.007 ± 0.002 | |
| Both NuSTAR detectors: | (A/B) | (A/B) | (A/B) | (A/B) | |||
| χ2/d.o.f. | 787/655 | 500/431 | 666/441 | 919/667 | 49/47 | 54/58 | |
 |
1.20 | 1.16 | 1.51 | 1.38 | 1.05 | 0.93 | |
| Single NuSTAR detector: | (B) | (B) | (A) | (B) | |||
| χ2/d.o.f. | 340/317 | 208/203 | 292/223 | 407/323 | |||
 |
1.07 | 1.02 | 1.31 | 1.26 | |||
Notes. Parameters without errors are kept frozen at the value shown. The dash marks components that are not part of the spectral model in a particular data set.
c1 is a constant between the NuSTAR detectors FPMA and FPMB and is allowed to vary during the fitting.
The following distance estimates have been used: GRS 1915+105: 8.6
kpc (Reid et al. 2014), Cyg X–3: 7.4 ± 1.1 kpc (McCollough et al. 2016), V4641 Sgr: 6.2 ± 0.7 kpc (MacDonald et al. 2014).
The following mass estimates have been used: GRS 1915+105: 12.4
M⊙ (Reid et al. 2014), Cyg X–3: 2.4
M⊙ (Zdziarski et al. 2013), V4641 Sgr: 6.4 ± 0.6 M⊙ (MacDonald et al. 2014).
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