Table 2
Results of the fit of NuSTAR and XMM-Newton spectra of Ser X-1 using Gaussian and diskline models.
| Component | Parameter | Gauss | Diskline | Gauss-pl | Diskline-pl | Diskline-pl-xmm |
|
|
||||||
| phabs | NH(× 1022 cm-2) | 0.4 (f) | 0.4 (f) | 0.4 (f) | 0.4 (f) | 0.863 ± 0.008 |
| bbody | kTbb(keV) | 0.47 ± 0.03 | 0.54 ± 0.06 | 0.44 ± 0.04 | 0.47 ± 0.05 | 0.47 ± 0.02 |
| R BB | (km) | 46.1 ± 6.3 | 34.3 ± 7.7 | 45.5 ± 9.5 | 39.2 ± 8.7 | 35.1 ± 3.2 |
| bbody | Norm (× 10-3) | 22.6 ± 2.3 | 21.8 ± 0.8 | 16.9 ± 3.4 | 16.3 ± 2.2 | 13.1 ± 0.9 |
|
|
||||||
| Gaussian | E (keV) | 6.57 ± 0.05 | – | 6.56 ± 0.05 | – | |
| Gaussian | Sigma (keV) | 0.37 ± 0.04 | – | 0.39 ± 0.04 | – | |
| Gaussian | Norm (× 10-3) | 4.03 ± 0.35 | – | 4.48 ± 0.34 | – | |
|
|
||||||
| diskline | line E (keV) | – | 6.54 ± 0.04 | – | 6.54 ± 0.03 | 6.48 ± 0.06 |
| diskline | Betor | – | −2.59 ± 0.12 | – | −2.54 ± 0.13 | −2.58 ± 0.18 |
| diskline | Rin (Rg) | – | 18.6 ± 4.9 | – | 19.2 ± 4.7 | 22.0 |
| diskline | Rout (Rg) | – | 2400(f) | – | 2400(f) | 2400(f) |
| diskline | Incl (deg) | – | 40.1 ± 3.6 | – | 41.5 ± 3.9 | 46.1 ± 5.6 |
| diskline | Norm (× 10-3) | – | 4.38 ± 0.47 | – | 4.54 ± 0.35 | 2.89 ± 0.28 |
|
|
||||||
| nthComp | Gamma | 2.41 ± 0.04 | 2.43 ± 0.04 | 2.26 ± 0.04 | 2.27 ± 0.04 | 2.10 |
| nthComp | kTe(keV) | 2.95 ± 0.05 | 2.98 ± 0.04 | 2.75 ± 0.05 | 2.76 ± 0.05 | 2.27 ± 0.16 |
| nthComp | kTbb(keV) | 0.96 ± 0.03 | 0.99 ± 0.04 | 0.90 ± 0.04 | 0.92 ± 0.04 | 0.92 ± 0.06; 0.82 ± 0.05; 0.88 ± 0.06 |
| nthComp | Norm (× 10-3) | 219 ± 11 | 200 ± 15 | 229 ± 12 | 217 ± 18 | 160 ± 13 |
|
|
||||||
| powerlaw | Index_pl | – | – | 3.20(f) | 3.20(f) | 3.20(f) |
| powerlaw | Norm | – | – | 0.84 ± 0.12 | 0.82 ± 0.13 | 0.72 ± 0.04 |
|
|
||||||
| gau-rgs | E (keV) | – | – | – | – | 0.528 (f) |
| gau-rgs | Sigma (× 10-3 keV) | – | – | – | – | 2.19 (f) |
| gau-rgs | Norm (× 10-3) | – | – | – | – | −18.4 (f) |
|
|
||||||
| gau-rgs | E (keV) | – | – | – | – | 0.541 (f) |
| gau-rgs | Sigma (× 10-3 keV) | – | – | – | – | 1.36 (f) |
| gau-rgs | Norm (× 10-3) | – | – | – | – | 57.1 (f) |
|
|
||||||
| gau-rgs | E (keV) | – | – | – | – | 0.714 ± 0.02 |
| gau-rgs | Sigma (× 10-3 keV) | – | – | – | – | 5.8 ± 0.6 |
| gau-rgs | Norm (× 10-3) | – | – | – | – | −12.1 ± 0.7 |
|
|
||||||
| – | Eq.W (eV) | 76 ± 6 | 85 ± 7 | 84 ± 6 | 89 ± 9 | 72 ± 16; 93 ± 18; 79 ± 16 |
| – | Obs. Flux | 5.25 ± 0.03 | 5.27 ± 0.03 | 5.27 ± 0.02 | 5.27 ± 0.02 | 3.68 ± 0.24 |
| – | Luminosity | 3.72 ± 0.02 | 3.72 ± 0.02 | 3.73 ± 0.02 | 3.73 ± 0.02 | 2.62 ± 0.17 |
|
|
||||||
 (d.o.f.) |
– | 1.2750(915) | 1.2186(913) | 1.14134(914) | 1.0961(912) | 1.3521(4546) |
Notes. Flux and luminosity were obtained for the 3–40 keV energy band. Flux units are 10-9 (erg/cm2/s), whereas luminosity 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 these parameters in the XMM-Newton fitting results (see text for more details). The parameter Eq. W refers to the equivalent width of the iron line at 6.48 keV detected in each observation. 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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