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Table 4
Simultaneous fitting results of combined, spin-phase resolved X-ray spectra of RX J0720.4−3125 using a condensed iron surface and hydrogen atmosphere model.
Fit | Groups* | |||||
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parameter** | I | II | III | IV | V | Remark |
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nH × 1020 [cm-2] | 1.20 ± 0.06 | 1.17 ± 0.06 | 1.17 ± 0.06 | 1.18 ± 0.06 | 1.18 ± 0.06 | free |
kTp1 [eV] | 104.0 ± 4.3 | 110.2 ± 4.1 | 108.3 ± 4.5 | 107.5 ± 4.0 | 106.6 ± 3.6 | free |
kTp2 [eV] | 102.5 ± 4.2 | 107.7 ± 3.9 | 109.5 ± 4.8 | 105.8 ± 3.8 | 105.6 ± 3.4 | free |
Bp12 × 1013 [G] | 3.00 ± 0.15 | ibid | ibid | ibid | ibid | linked |
θ [°] | 88.9 ± 4.8 | ibid | ibid | ibid | ibid | linked |
i [°] | 42.8 ± 2.2 | ibid | ibid | ibid | ibid | linked |
z | 0.205 ± 0.001 | ibid | ibid | ibid | ibid | linked |
σline [ev] | 268.3 ± 50.9 | 313.4 ± 38.6 | 329.0 ± 56.9 | 302.7 ± 60.3 | 310.6 ± 60.4 | free |
τline | 0.80 ± 0.24 | 1.56 ± 0.26 | 1.38 ± 0.26 | 1.37 ± 0.26 | 1.18 ± 0.22 | free |
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Reduced χ2 | χ2/ d.o.f. = 6070/4910 = 1.24 | |||||
C-statistic | 6050 using 5050 PHA bins and 4910 d.o.f. |
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