Table 1.
Results of the joint fits of the Swift spectrum and the combined spectrum extracted from the two NuSTAR observations of 1E 1547.0–5408.
| Model | kTBB1 | RBB1 | kTBB2 | RBB2 | Γhard | FX, abs | LX | LBB1/LBB2/LPL, H |  (d.o.f.) |
|---|---|---|---|---|---|---|---|---|---|
| (keV) | (km) | (keV) | (km) | (10−11 erg cm−2 s−1) | (1034 erg s−1) | (1034 erg s−1) | |||
| 2BB+PL | 0.58 ± 0.03 | 1.7 ± 0.4 | 1.13 ± 0.08 | 0.2 ± 0.1 | 0.00 ± 0.09 | 1.53 ± 0.07 | 6.6 ± 0.1 | (3.97 ± 0.07)/(0.8 ± 0.1)/(1.8 ± 0.1) | 0.97 (301) |
| kTBB | RBB | Γsoft | Ebreak | Γhard | FX, abs | LX | LBB/LPL, S/LPL, H |  (d.o.f.) |
|
| (keV) | (km) | (keV) | (10−11 erg cm−2 s−1) | (1034 erg s−1) | (1034 erg s−1) | ||||
| BB+2PL | 0.66 ± 0.01 | 0.9 ± 0.3 | 3.8 ± 0.2 | 12.8 ± 0.4 | 0.0 ± 0.1 | 1.60 ± 0.06 | 7.0 ± 0.2 | (2.6 ± 0.2)/(2.7 ± 0.3)/(1.7 ± 0.2) | 0.97 (301) |
| kT | β | Δψ | norm | Γhard | FX, abs | LX |  /LPL, H |
 (d.o.f.) |
|
| (keV) | (rad) | (10−1) | (10−11 erg cm−2 s−1) | (1034 erg s−1) | (1034 erg s−1) | ||||
| ntz+PL | 0.61 ± 0.01 | 0.20 ± 0.01 | 0.71 ± 0.02 | 1.2 ± 0.1 | −0.20 ± 0.08 | 1.56 ± 0.05 | 6.8 ± 0.1 | (4.78 ± 0.05)/(1.9 ± 0.1) | 0.99 (301) |
Notes. The absorption column density was fixed to NH = 4.6 × 1022 cm−2 for the 2BB+PL and NTZ+PL models, and to NH = 4.9 × 1022 cm−2 for the BB+2PL model. In the NTZ model, β denotes the bulk motion velocity of the charged particles in the magnetosphere and Δψ the twist angle. BB radii and luminosities are evaluated for an observer at infinity and for a source distance of 4.5 kpc. FX, abs and LX are evaluated within the 0.3–70 keV energy range; LBB1, LBB2, LBB, LPL, S and 
in the 0.3–10 keV interval; LPL, H within the 10–70 keV band. In the BB+2PL model, the soft PL component tends to give an unphysical overestimate for the luminosity below ≈1 keV. In order to obtain a more reliable estimate for LPL, S, the soft PL component is actually a broken PL where we fix the photon index of the low-energy PL component to −3, and allow the break energy to vary. The best-fitting value for the break energy is around 1 keV, so that the contribution to LPL, S is negligible below 1 keV.
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