Table 6
Evaluation of the pile-up effects on the XMM-Newton EPIC-pn data of 4U 1705−44 in the soft state, using the RGS and pn spectra.
| Component | Parameter | pn-all | pn-1 | pn-2 | pn-3 | pn-4 | pn-5 | pn-6 | pn-7 | BeppoSAX |
|
|
||||||||||
| phabs | NH (× 1022 cm-2) | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.6 ± 0.1 | 1.9 ± 0.1 |
| rdblur | Betor |
|
−2.32 ± 0.03 |
|
|
|
|
−2.4 ± 0.1 | −2.4 ± 0.1 | −2 (frozen) |
| rdblur | Rin (GM/c2) | 14 ± 2 |
|
|
15 ± 2 |
|
16 ± 3 |
|
|
|
| rdblur | i (°) | 38 ± 1 | 39 ± 1 |
|
39 ± 2 |
|
42 ± 2 |
|
|
|
| edge | E (keV) | 8.6 ± 0.1 | 8.6 ± 0.1 | 8.6 ± 0.1 | 8.6 ± 0.1 | 8.7 ± 0.1 |
|
8.8 ± 0.2 |
|
− |
| edge | Max τ (× 10-2) | 5.1 ± 0.4 | 5.7 ± 0.4 | 7 ± 1 | 7 ± 1 | 8 ± 2 | 8 ± 2 |
|
|
− |
| bbody | kTbb (keV) | 0.57 ± 0.01 | 0.57 ± 0.01 | 0.57 ± 0.01 | 0.56 ± 0.01 | 0.55 ± 0.02 | 0.55 ± 0.02 | 0.54 ± 0.01 | 0.54 ± 0.02 | 0.56 ± 0.01 |
| bbody | Norm (× 10-2) | 3.0 ± 0.1 | 2.9 ± 0.1 | 3.1 ± 0.1 | 3.0 ± 0.1 | 3.2 ± 0.1 | 3.2 ± 0.1 | 3.4 ± 0.1 | 3.4 ± 0.1 | 2.2 ± 0.1 |
| compTT | kTo (keV) | 1.31 ± 0.01 | 1.29 ± 0.02 |
|
|
|
|
1.36 ± 0.05 |
|
|
| compTT | kTe (keV) |
|
|
|
|
|
|
|
|
2.7 ± 0.1 |
| compTT | τ |
|
6.8 ± 0.1 |
|
5.9 ± 0.3 |
|
|
|
|
11.0 ± 0.6 |
| compTT | Norm (× 10-2) |
|
|
30 ± 1 |
|
|
|
|
|
35 ± 2 |
| gauss | E (keV) | 2.64 ± 0.03 | 2.67 ± 0.03 | 2.65 ± 0.03 | 2.65 ± 0.03 | 2.67 ± 0.05 | 2.66 ± 0.05 |
|
|
− |
| gauss | Norm (× 10-3) | 0.9 ± 0.2 | 1.3 ± 0.2 | 2.1 ± 0.3 |
|
1.7 ± 0.6 |
|
|
|
− |
| gauss | E (keV) | 3.29 ± 0.01 |
|
3.29 ± 0.02 |
|
|
|
3.27 ± 0.03 |
|
− |
| gauss | Norm (× 10-3) | 1.9 ± 0.2 | 2.1 ± 0.2 | 2.4 ± 0.2 | 2.6 ± 0.3 |
|
3.1 ± 0.6 |
|
2.8 ± 0.7 | − |
| gauss | E (keV) |
|
|
3.89 ± 0.02 | 3.88 ± 0.02 | 3.88 ± 0.02 | 3.86 ± 0.03 |
|
|
− |
| gauss | Norm (× 10-3) | 1.7 ± 0.1 | 2.0 ± 0.1 | 2.1 ± 0.2 | 2.4 ± 0.2 | 2.9 ± 0.4 |
|
3.3 ± 0.6 |
|
− |
| gauss | E (keV) | 6.64 ± 0.01 | 6.64 ± 0.01 | 6.64 ± 0.01 | 6.62 ± 0.02 |
|
|
6.58 ± 0.04 | 6.58 ± 0.04 |
|
| gauss | Norm (× 10-3) |
|
4.1 ± 0.2 | 4.3 ± 0.1 |
|
4.4 ± 0.4 | 4.7 ± 0.4 |
|
|
|
 (d.o.f.) |
1.20 (1024) | 1.15 (1024) | 1.14 (1024) | 1.15 (1024) | 1.13 (1024) | 1.11 (1024) | 1.13 (1024) | 1.14 (1024) | 1.18 (524) | |
Notes. We compare the parameters obtained when we exclude 0, 1, 2, until the 7 brightest central columns in the pn CCD, which correspond to spectra named pn-all, pn-1, pn-2, up to pn-7, respectively (see text). The last column contains the results from BeppoSAX data in the soft state as reported by Piraino et al. (2007), to compare the values of the parameters obtained with XMM-Newton with those obtained with non-CCD instruments. The model applied on the pn and RGS data consists of const*phabs*rdblur*edge*(bbody+compTT+gauss+gauss+gauss+gauss). The model used to fit the BeppoSAX data is phabs*(bbody+compTT+powerlaw+diskline).
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