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Table 2

Spectral analysis of Fairall 51 – model parameters.

Model component Parameter Model A Model B Model C Model D
1st obs. 4th obs. 1st obs. 4th obs. 1st obs. 4th obs. 1st obs. 4th obs.
power law Γ 1.80 ± 0.02 2.26 ± 0.04
... Kdirect [ 10-3 ]
... Kscattered [ 10-3 ] 0.17 ± 0.01 0.17 ± 0.01 0.13 ± 0.02
local cold absorber NH [ 1022 cm-2 ] 3.9 ± 0.1 7.6 ± 0.4 – –
low-ionised absorber NH [ 1022 cm-2 ] – – 5.7 ± 0.4
... log ξ – – 1.2 ± 0.1
mid-ionised absorber 2 NH [ 1022 cm-2 ] – – 7.7 ± 0.4
... log ξ – – 1.9 ± 0.1 1.6 ± 0.1
high-ionised absorber NH [ 1022 cm-2 ] 114 ± 17
... log ξ 3.3 ± 0.1 3.6 ± 0.2
... voutflow [km s-1] 3300 ± 600 0 ± 1500
very-high ionised absorber NH [ 1022 cm-2 ] – –
... log ξ – 4.2 ± 0.2 –
... voutflow [km s-1] – –
Gaussian line E [keV] 6.37 ± 0.02 – –
... σ [keV] – –
... normalisation [ 10-5 ] 1.2 ± 0.2 – –
... equivalent width [eV] – –
relativistic reflection spin a/M – – –
... inclination [deg] – – –
... radial emissivity – – – 3.5 ± 0.3
... normalisation [ 10-3 ] – – –
distant reflection iron abundance [Solar] – – < 0.35
... normalisation [ 10-3 ] – –
fit goodness C / ν 6399 / 5809 6297 / 5801 6094 / 5810 5988 / 5806
test statistics χ 2 / ν 6410 / 5809 6294 / 5801 6097 / 5810 5967 / 5806

Notes. The values of the model parameters which were allowed to vary between the four observations are reported for the 1st (highest-flux) and 4th (lowest-flux) observations only for brevity. A single value for all observations is reported when the parameters were free in the fitting but fixed to the same value or did not significantly change between the observations. All the errors correspond to the 90% confidence level for one interesting parameter. All normalisations are expressed in units of photons keV-1 cm-2 s-1 at 1 keV.

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