Table 1
Best-fit parameters for spectra of GX 3+1 observed with the XMM-Newton EPIC-pn using different models and data extraction.
| Parameter | Model 2 | Model 3 | ||
|
|
||||
| Region 1 | Region 2 | Region 3 | Region 3 | |
|
|
||||
| NH[1022 cm-2] | 1.7 ± 0.1 | 1.7 ± 0.1 | 1.8 fixed | 1.8 fixed |
| kTbb[keV] | 1.70 ± 0.02 | 1.68 ± 0.02 | 1.62 ± 0.01 | 1.60 ± 0.01 |
| Lbb | 4.4 ± 0.1 | 4.4 ± 0.1 | 4.4 ± 0.1 | 4.45 ± 0.05 |
| kTdbb[keV] | 0.93 ± 0.03 | 0.92 ± 0.04 | 0.89 ± 0.02 | 0.85 ± 0.02 |
| Ndbb | 228 ± 37 |
|
|
|
| Eline (keV) | 3.37 ± 0.02 | 3.38 ± 0.02 | 3.38 ± 0.03 | 3.32 ± 0.03 |
| σ[keV] | 0.12 ± 0.03 | 0.11 ± 0.03 | 0.09 ± 0.04 | |
| Iline (10-4) | 9 ± 2 | 8 ± 2 | 8 ± 2 | 13 ± 3 |
| EqW (eV) | 5 ± 1 | 5 ± 1 | 5 ± 1 | 8 ± 2 |
| Eline (keV) | 3.95 ± 0.02 | 3.95 ± 0.02 | 3.94 ± 0.02 | 3.91 ± 0.03 |
| σ[keV] | 0.08 ± 0.03 | 0.06 ± 0.03 | 0.07 ± 0.04 | |
| Iline (10-4) | 6 ± 1 | 5 ± 1 | 6 ± 2 | 12 ± 2 |
| EqW (eV) | 5 ± 3 | 4 ± 3 | 5 ± 3 | 10 ± 2 |
| Eline (keV) | 6.62 ± 0.02 | 6.60 ± 0.02 | 6.60 ± 0.03 | 6.61 ± 0.02 |
| Iline (10-3) | 2.4 ± 0.2 | 2.6 ± 0.2 |
|
2.6 ± 0.2 |
| EW[eV] | 57 ± 5 | 63 ± 5 | 70 ± 6 | 64 ± 5 |
| Betor | −2.61 ± 0.03 | −2.62 ± 0.07 | −2.6 ± 0.1 | −2.54 ± 0.09 |
| Rin (GM/c2) | 25 ± 4 |
|
|
|
| Incl (deg) | 37 ± 2 | 39 ± 2 |
|
|
| Δχ2 | 108 | 73 | 36 | |
| ProbF−test | 1.3 × 10-15 | 2 × 10-12 | 2 × 10-7 | |
| Flux (10-9 ) | 4.53 ± 0.05 | 4.49 ± 0.05 | 4.48 ± 0.06 | 4.48 ± 0.06 |
|
|
||||
| χ2 (d.o.f.) | 441 (313) | 389 (313) | 352 (314) | 369 (316) |
Notes. The continuum used in both models reported here, Models 2 and 3, consists of the sum of a blackbody and a multicolor disk blackbody. For Model 2 we report results obtained using data extracted from three different regions. In Model 3, the low-energy lines are modeled with diskline profiles, with all parameters fixed at those of the iron diskline except the line centroid energy and the normalization. The blackbody luminosity is given in units of 
, where L37 is the bolometric luminosity in units of 1037 ergs/s and D10 the distance to the source in units of 10 kpc. The diskbb normalization is given in units of (Rin/D10)2cosθ where Rin is an apparent disk radius in km and θ the angle of the disk. The line intensity Iline is given in units ph cm-2 s-1. Δχ is referred to the switch from a Gaussian to a diskline to model the iron line, and the ProbF−test the relative probability of chance improvement given by the F-test. Flux is calculated in the 2 − 10 keV band, and given in units erg cm-2 s-1. Uncertainties are given at a 90% confidence level.
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