Table 2
Results of the X-ray spectral fitting for Cyg OB2 #8A.
| Facility | Observation ID |
|
norm2 | norm3 |
|
|
 (d.o.f.) |
||||||||||
|
|
|
||||||||||||||||
| (10-12 erg cm-2 s-1) | (10-12 erg cm-2 s-1) | ||||||||||||||||
| (1022 cm-2) | (10-3 cm-5) | (10-3 cm-5) | Total | Soft | Hard | Total | Soft | Hard | |||||||||
|
|
|||||||||||||||||
| XMM-Newton | 0200450201 | 0.47 |
7.57 |
5.63 |
6.24 ± 0.03 | 2.83 ± 0.01 | 3.42 ± 0.03 | 21.1 ± 0.1 | 17.1 ± 0.1 | 3.97 ± 0.03 | 1.37(551) | ||||||
| 0200450301 | 0.59 |
8.74 |
3.32 |
4.83 ± 0.02 | 2.31 ± 0.01 | 2.52 ± 0.02 | 15.0 ± 0.1 | 12.0 ± 0.1 | 2.96 ± 0.03 | 1.30(504) | |||||||
| 0200450401 | 0.48 |
7.00 |
5.43 |
5.94 ± 0.02 | 2.69 ± 0.01 | 3.25 ± 0.03 | 20.2 ± 0.1 | 16.5 ± 0.1 | 3.78 ± 0.03 | 1.39(568) | |||||||
| 0200450501 | 0.50 |
9.04 |
3.72 |
5.48 ± 0.04 | 2.71 ± 0.02 | 2.77 ± 0.03 | 19.2 ± 0.1 | 15.9 ± 0.1 | 3.26 ± 0.04 | 1.37(477) | |||||||
| 0505110301 | 0.52 |
8.44 |
3.88 |
5.30 ± 0.03 | 2.55 ± 0.02 | 2.75 ± 0.04 | 17.8 ± 0.1 | 14.6 ± 0.1 | 3.23 ± 0.04 | 1.09(452) | |||||||
| 0505110401 | 0.47 |
7.82 |
4.95 |
5.95 ± 0.03 | 2.79 ± 0.02 | 3.16 ± 0.03 | 20.9 ± 0.1 | 17.2 ± 0.1 | 3.68 ± 0.04 | 1.38(517) | |||||||
| 0677980601 | 0.48 |
7.45 |
5.48 |
6.11 ± 0.04 | 2.80 ± 0.02 | 3.31 ± 0.04 | 20.7 ± 0.1 | 16.8 ± 0.1 | 3.84 ± 0.05 | 1.39(188) | |||||||
|
|
|||||||||||||||||
| Swift | 0031904001 | 0.41 |
9.08 |
6.37 |
7.43 ± 0.26 | 3.43 ± 0.14 | 3.99 ± 0.28 | 27.2 ± 1.0 | 22.5 ± 0.9 | 4.67 ± 0.33 | 0.92(68) | ||||||
| 00031904002–4 | 0.49 |
9.47 |
5.26 |
6.53 ± 0.13 | 3.01 ± 0.07 | 3.52 ± 0.13 | 21.8 ± 0.4 | 17.6 ± 0.4 | 4.12 ± 0.15 | 1.24(172) | |||||||
| 00031904005 | 0.61 |
12.3 |
3.47 |
5.76 ± 0.23 | 2.72 ± 0.13 | 3.04 ± 0.23 | 16.7 ± 0.7 | 13.1 ± 0.6 | 3.59 ± 0.28 | 0.97(53) | |||||||
| 00032767001+2 | 0.54 |
10.5 |
5.48 |
6.69 ± 0.20 | 2.99 ± 0.11 | 3.71 ± 0.21 | 20.2 ± 0.6 | 15.8 ± 0.6 | 4.34 ± 0.25 | 1.13(83) | |||||||
| All but 4005 | 0.48 |
9.72 |
5.78 |
6.91 ± 0.10 | 3.13 ± 0.06 | 3.78 ± 0.11 | 22.6 ± 0.3 | 18.2 ± 0.3 | 4.41 ± 0.12 | 1.25 (225) | |||||||
Notes. The fitted model has the form wabs ∗ phabs ∗ (apec + apec + apec), with the first absorption fixed at 0.91 × 1022 cm-2, the temperatures fixed at 0.23, 0.93, and 2.0 keV, and the normalization factor of the first thermal component fixed at 0.0706 cm-5. The lower and upper limits of the 90% confidence intervals on spectral parameters can be derived from the indices and exponents, respectively, while the relative ± 1σ errors on fluxes correspond to the relative ± 1σ errors on count rates. Normalization factors are defined as 
dV, where D is the source distance, ne and nH the electron and hydrogen number densities, respectively. The total, soft, and hard energy bands correspond to the 0.5–10.0 keV, 0.5–2.0 keV, and 2.0–10.0 keV intervals, respectively.
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