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Table 4.
Model parameters from the initial fits to the V404 Cyg preflare X-ray spectrum (3–79 keV).
| Model: PHABS × SMEDGE × (PCFABS1 × CUTOFFPL + PCFABS2 × DISKBB + GAUSS1 + GAUSS2) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| PHABS |
SMEDGE |
PCFABS1 |
CUTOFFPL |
||||||
| NH | E | τ | σ | NH | fcov | Norm | Γ | Ecut | |
| (1022 cm−2) | (keV) | (keV) | (1024 cm−2) | (keV) | |||||
| 2.8 ± 0.7 | 8.7 ± 0.1 | 0.30 |
0.5 ± 0.2 | 2.4 ± 0.2 | 0.92 ± 0.01 | 33 |
2.2 ± 0.2 | 19 ± 3 | |
| PCFABS2 |
DISKBB |
GAUSS1 |
GAUSS2 |
||||||
| NH | fcov | Norm | kT | E1 | σ1 | Norm | E2 | σ2 | Norm |
| (1022 cm−2) | (keV) | (keV) | (keV) | (×10−3) | (keV) | (keV) | (×10−3) | ||
| 46 ± 3 | 0.92 ± 0.01 | 518 |
1.34 ± 0.03 | 6.4 | 0.46 ± 0.02 | 36 ± 3 | 6.5 | 0.002 | −3.6 ± 0.7 |
Both NuSTAR detectors: χ2/d.o.f. = 871/617  = 1.41 FPMA-only: χ2/d.o.f. = 347/305  = 1.14 |
|||||||||
| Model: PHABS × SMEDGE × PCFABS × (GAUSS + RELXILLCP) |
|||||||||
| PHABS |
SMEDGE |
PCFABS |
GAUSS |
||||||
| NH | E | τ | σ | NH | fcov | E | σ | Norm | |
| (1022 cm−2) | (keV) | (keV) | (1022 cm−2) | (keV) | (keV) | (×10−3) | |||
2.7 |
7.4 ± 0.07 | 0.32 |
1 | 39 ± 2 | 0.82 ± 0.01 | 6.5 | 0.002 | −11 ± 2 | |
| RELXILLCP | |||||||||
| Norm | Γ | kTe | θinc | Rf | Rin | a | log ξ | AFe | |
| (×10−3) | (keV) | (deg) | (solar) | ||||||
| 27 ± 2 | 1.85 ± 0.01 | 3.9 ± 0.2 | 20 |
−2 | 2.6 |
−0.998–0.998 | 3.43 ± 0.03 | 1.8 ± 0.2 | |
Both NuSTAR detectors: χ2/d.o.f. = 873/617  = 1.41 FPMA-only: χ2/d.o.f. = 335/306  = 1.09 |
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