Table 2.
Results from the modelling of the XMM-Newton spectra of Holmberg II X-1 with the data of Obs. ID 0200470101.
| Parameter / | RHBB | RHBD | RHBM | RHBCom | RHDCom | RHMM | RHDD | RHBDP | RHMMGGG |
|---|---|---|---|---|---|---|---|---|---|
| component | model | model | model | model | model | model | model | model | model |
| LX bb1 | 4.63 ± 0.07 | 3.53 ± 0.22 | 3.68 ± 0.07 | 0.05 ± 0.02 | – | – | – | 2.89 ± 0.06 | – |
| LX bb2 | 3.60 ± 0.12 | – | – | – | – | – | – | – | – |
| LX mbb1 | – | – | 4.8 ± 0.1 | – | – | 5.09 ± 0.20 | – | – | 5.04 ± 0.20 |
| LX mbb2 | – | – | – | – | – | 4.02 ± 0.17 | – | – | 4.02 ± 0.16 |
| LX dbb1 | – | 4.96 ± 0.06 | – | – | 0.29 ± 0.18 | – | 4.96 ± 0.30 | 4.2 ± 0.3 | – |
| LX dbb2 | – | – | – | – | – | – | 4.31 ± 0.26 | – | – |
| LX comt | – | – | – | 8.7 ± 0.8 | 9.17 ± 2.19 | – | – | – | – |
| LX gauss | – | – | – | – | – | – | – | – | 0.05 ± 0.08 |
| LX pow | – | – | – | – | – | – | – | 3.4 ± 0.1 | – |
| kTbb1 | 0.217 ± 0.001 | 0.206 ± 0.001 | 0.204 ± 0.001 | 0.144 ± 0.001 | – | – | – | 0.194 ± 0.005 | – |
| kTbb2 | 0.783 ± 0.006 | – | – | – | – | – | – | – | – |
| kTmbb1 | – | – | 1.33 ± 0.01 | – | – | 0.369 ± 0.005 | – | – | 0.375 ± 0.006 |
| kTmbb2 | – | – | – | – | – | 1.61 ± 0.02 | – | – | 1.62 ± 0.03 |
| kTdbb1 | – | 2.35 ± 0.02 | – | – | 0.135 ± 0.005 | – | 0.63 ± 0.01 | 1.62 ± 0.03 | – |
| kTdbb2 | – | – | – | – | – | – | 2.77 ± 0.04 | – | – |
| kTseed | – | – | – | 0.144 (coupled) | 0.135 (coupled) | – | – | – | – |
| kTe | – | – | – | 2.76 ±  |
3.98 ±  |
– | – | – | – |
| τ | – | – | – | 4.27 ± 0.35 | 3.24 ±  |
– | – | – | – |
| Γ | – | – | – | – | – | – | – | 0.59 | – |
| τ0 | – | – | – | – | – | – | – | 0.1265 | – |
| NH | 0.500 ±  |
0.500 ±  |
0.500 ±  |
0.50 ±  |
0.80 ± 0.01 | 0.65 ± 0.03 | 0.70 ± 0.02 | 0.500 ±  |
0.65 ± 0.03 |
 |
– | – | – | – | – | – | – | – | 0.529 ± 0.007 |
 |
– | – | – | – | – | – | – | – | 0.80 ± 0.10 |
 |
– | – | – | – | – | – | – | – | 0.90 ± 0.01 |
| FWHM | – | – | – | – | – | – | – | – | 0.001 |
| NormPow | – | – | – | – | – | – | – | 1161 ± 40 | – |
| Norm1 | – | – | – | – | – | – | – | – | 622 ±  |
| Norm2 | – | – | – | – | – | – | – | – | −34.4 ±  |
| Norm3 | – | – | – | – | – | – | – | – | 165 ± 39 |
| χ2/d.o.f. | 1978/404 | 1056/404 | 1102/404 | 558/403 | 545/403 | 640/404 | 661/404 | 622/403 | 597/398 |
 |
1001 | 478 | 504 | 187 | 166 | 227 | 256 | 222 | 209 |
 |
472 | 267 | 279 | 163 | 167 | 179 | 185 | 180 | 166 |
 |
505 | 311 | 319 | 208 | 212 | 234 | 240 | 220 | 223 |
Notes. Parameter units: 
, 
and 
(in keV unit) refer to the centroids of each Gaussian line. Norm1, Norm2, and Norm3 (in 1044 ph s−1 units) are their normalisations. The temperatures kT (for each model) and FWHM are expressed in keV. The X-ray and bolometric luminosities LX and LBOL (always intrinsic or unabsorbed) are calculated, respectively, between the 0.3–10 keV and 0.001–1000 keV bands, and are expressed in 1039 erg s−1 unit. The column density of the cold gas NH is in 1021 cm−2 unit. τ is the optical depth of the comptonisation component. Γ and NormPow are the slope and the normalization (expressed in 1044 ph s−1 (keV units) of the powerlaw component. Finally, τ0 is the optical depth of the cutoff component at E = 7.9 keV (for more information see the SPEX manual).
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