Table 3
Results of the fit of NuSTAR and XMM-Newton spectra of Ser X-1 using rdblur combined with rfxconv or reflionx.
| Component | Parameter | Rdb-rfxconv | Rdb-reflio | Rdb-rfxconv-pl | Rdb-reflio-pl | Rdb-rfxconv-pl-xmm |
|
|
||||||
| phabs | NH(× 1022 cm-2) | 0.4 (f) | 0.4 (f) | 0.4 (f) | 0.4 (f) | 0.896 ± 0.005 |
| bbody | kTbb(keV) | 0.71 ± 0.02 | 0.80 ± 0.02 | 0.54 |
0.54 ± 0.06 | 0.39 ± 0.04 |
| R BB | (km) | 23.6 ± 1.3 | 15.9 ± 0.8 | 24.7 ± 7.9 | 19.2 ± 4.6 | 49.4 ± 10.6 |
| bbody | Norm (× 10-3) | 30.9 ± 0.5 | 22.5 ± 0.6 | 11.3 |
6.8 ± 1.2 | 12.3 ± 1.6 |
|
|
||||||
| highecut | Ecut(keV) | – | 0.1 (f) | – | 0.1 (f) | – |
| highecut | Efold(keV) | – | 8.61 ± 0.19 | – | 5.04 ± 0.09 | – |
|
|
||||||
| rdblur | Betor | −3.02 ± 0.36 | −2.49 ± 0.15 | −2.64 ± 0.16 | −2.53 ± 0.14 | −2.46 |
| rdblur | Rin (Rg) | 7.7 ± 1.3 | 15.5 ± 4.6 | 13.4 ± 2.8 | 13.2 ± 3.1 | 14.2 |
| rdblur | Rout (Rg) | 2400(f) | 2400(f) | 2400(f) | 2400(f) | 2400(f) |
| rdblur | Incl (deg) | 29.2 ± 1.8 | 32.2 ± 1.7 | 27.1 ± 1.9 | 28.8 ± 2.4 | 27(f) |
|
|
||||||
| reflionx | Gamma | – | 2.88 ± 0.08 | – | 1.51 ± 0.03 | – |
| reflionx | ξ | – | 4990 |
– | 490 |
– |
| reflionx | Norm (× 10-5) | – | 1.97 ± 0.59 | – | 10.7 ± 3.5 | – |
|
|
||||||
| rfxconv | rel_refl | 0.55 ± 0.04 | – | 0.24 ± 0.04 | – | 0.183 ± 0.022 |
| rfxconv | cosIncl | 0.88(f) | – | 0.88(f) | – | 0.891(f) |
| rfxconv | log(ξ) | 2.68 ± 0.05 | – | 2.69 |
– | 3.04 ± 0.11 |
|
|
||||||
| nthComp | Gamma | 3.55 ± 0.18 | 2.88 ± 0.08 | 2.17 ± 0.04 | 1.51 ± 0.03 | 2.45 ± 0.22 |
| nthComp | kTe(keV) | 4.36 |
3.19 ± 0.08 | 2.70 ± 0.04 | 5.05 ± 0.09 | 3.83 |
| nthComp | kTbb(keV) | 1.51 ± 0.04 | 1.43 ± 0.05 | 0.93 ± 0.07 | 1.04 ± 0.18 | 0.85 ± 0.05; 0.76 ± 0.06; 0.82 ± 0.06 |
| nthComp | Norm (× 10-3) | 71.2 ± 7.2 | 69.7 ± 4.2 | 192 ± 24 | 286 |
205 ± 21 |
|
|
||||||
| powerlaw | Index_pl | – | – | 3.21 ± 0.24 | 3.20(f) | 3.98 ± 0.31 |
| powerlaw | Norm | – | – | 1.08 |
0.82 ± 0.13 | 0.68 ± 0.05 |
|
|
||||||
| – | Obs. Flux | 5.26 ± 0.15 | 5.27 ± 0.17 | 5.27 ± 0.62 | 5.27 ± 0.55 | 4.12 ± 0.38 |
| – | Luminosity | 3.73 ± 0.11 | 3.74 ± 0.12 | 3.74 ± 0.44 | 3.74 ± 0.39 | 2.93 ± 0.27 |
|
|
||||||
 (d.o.f.) |
– | 1.0983(913) | 1.0838(913) | 1.0017(911) | 1.0123(912) | 1.33762(4546) |
Notes. For each fit, the abundance of iron in the reflection models was kept frozen: Fe/solar = 1. Flux and luminosity are obtained for the 3–40 keV energy band. Fluxes units are 10-9 (ergs/cm2/s), whereas luminosities units are 1037 (erg/s). The seed-photon temperature was left free to vary among the three different XMM-Newton observations, this is why we report three values for this parameters in the XMM-Newton fitting results (see text for more details). Errors are reported with a 90% confidence. RBB and luminosities are estimated assuming a distance of 7.7 kpc (Galloway et al. 2008).
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