Table 6.
Model B parameters for GRS 1915+105, Cyg X–3 and V4641 Sgr.
| Model B: C1 × PHABS1 × SMEDGE × (C2 × BORUS02(RED) + C3 × BORUS02(BLUE) + PHABS2 × CABS × CUTOFFPL | |||||||
|---|---|---|---|---|---|---|---|
| + CONST4 × CUTOFFPL + GAUSS1 + GAUSS2) | |||||||
| GRS 1915+105 | Cyg X–3 | V4641 Sgr | |||||
| Epoch 1 | Epoch 2 | Epoch 3 | Epoch 1 | Epoch 2 | |||
| PHABS1 × SMEDGE | |||||||
| NH, ism | 1022 cm−2 | 3.5 | 3.5 | 3.5 | 3.5 | 0.2 | 0.2 |
| E | keV | 7.13 |
8.8 ± 0.1 | 8.47 |
8.86 |
9.3 ± 0.1 | 9.2 ± 0.1 |
| τ | 0.85 |
0.48 ± 0.05 | 1.07 |
0.37 |
0.78 |
0.46 ± 0.04 | |
| σ | keV | 2.0 | 2.0 | 2.7 | 0.7 ± 0.1 | 0.5 | 0.5 |
| BORUS02 | |||||||
| log NH, tor | 24.37 ± 0.02 | 24.40 ± 0.04 | 24.45 |
24.03 ± 0.02 | 25.2 |
>25.4 | |
| cos(θtor) | >0.94 | 0.80 |
0.57 ± 0.02 | >0.74 | < 0.36 | 0.36 ± 0.01 | |
| cos(θinc) | 0.6 | 0.68 |
0.45 |
0.75 |
0.35 | 0.35 | |
| z | 0.057 ± 0.008 | 0.007 |
< 0.004 | 0.003 | 0.029 |
0.016 ± 0.002 | |
| PHABS2 × CABS × CUTOFFPL | |||||||
| log NH, los | 23.35 ± 0.01 | 23.67 ± 0.02 | 23.71 ± 0.02 | 23.52 ± 0.01 | 22.8 ± 0.1 | 22.2 |
|
| Norm | 0.65 |
0.20 ± 0.02 | 0.44 |
5.4 |
0.18 ± 0.02 | 0.05 ± 0.01 | |
| Γ | 2.27 ± 0.02 | 1.60 |
1.80 |
2.32 ± 0.03 | >2.54 | 1.64 |
|
| Ecut | keV | >388 | 23.6 |
20.8 ± 0.4 | 26 |
>74 | 20 |
| GAUSS1 + GAUSS2 | |||||||
| E1 | keV | 6.56 ± 0.04 | 6.76 ± 0.08 | 6.70 ± 0.02 | 6.67 | – | – |
| σ1 | keV | 0.002 | 0.002 | 0.002 | 0.002 | – | – |
| Norm | ×10−3 | −0.79 ± 0.04 | 0.20 |
0.55 |
6 ± 0.2 | – | – |
| E2 | keV | 8.36 ± 0.08 | – | – | 7.8 | – | – |
| σ2 | keV | 0.002 | – | – | 0.002 | – | – |
| Norm | ×10−3 | 0.2 ± 0.03 | – | – | 0.6 ± 0.1 | – | – |
| Constants | |||||||
| C1 | 1.01 | 1.02 | 1.00 | 1.01 | – | – | |
| C2 | 1.4 ± 0.1 | 0.92 |
2.4 |
0.73 |
– | – | |
| C3 | < 0.18 | < 0.42 | < 0.23 | 0.5 ± 0.1 | 43 |
30 |
|
| C4 | 0.59 ± 0.02 | 0.18 ± 0.01 | 0.14 ± 0.01 | 0.26 ± 0.01 | – | – | |
| Fluxes (10−8 erg s−1 cm−2) | |||||||
| Abs. | 0.22 ± 0.01 | 0.15 ± 0.02 | 0.15 ± 0.02 | 0.60 ± 0.04 | 0.07 ± 0.02 | 0.12 ± 0.02 | |
| Unabs. | 0.31 ± 0.01 | 0.24 ± 0.02 | 0.28 ± 0.02 | 1.11 ± 0.05 | 0.08 ± 0.02 | 0.13 ± 0.02 | |
| LOS | 52% | 55% | 58% | 67% | 26% | 20% | |
| Scattered | 17% | 35% | 32% | 16% | 74% | 80% | |
| Leaked | 31% | 10% | 10% | 17% | 0% | 0% | |
| Luminosities (a) and Eddington ratio (b) (3–79 keV) | |||||||
| Abs. | 1038 erg s−1 | 0.19 |
0.13 |
0.13 |
0.4 |
0.03 |
0.06 |
| Unabs. | 1038 erg s−1 | 0.27 |
0.21 |
0.25 |
0.7 |
0.03 |
0.06 ± 0.01 |
| L/LEdd | 0.02 ± 0.01 | 0.013 |
0.016 |
0.12 |
0.004 |
0.007 |
|
| Both NuSTAR detectors: | (A/B) | (A/B) | (A/B) | (A/B) | |||
| χ2/d.o.f. | 818/650 | 440/427 | 716/439 | 907/663 | 50/44 | 64/56 | |
 |
1.26 | 1.03 | 1.63 | 1.37 | 1.13 | 1.15 | |
| Single NuSTAR detector: | (B) | (B) | (A) | (B) | |||
| χ2/d.o.f. | 348/312 | 180/198 | 244/220 | 392/318 | |||
 |
1.12 | 0.91 | 1.11 | 1.23 | |||
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.
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). For Cyg X–3 we use Eddington ratio that is twice the normal due to the accreting matter being helium-dominated.
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