Table D.1.
Parameter constraints for the joint fit of the spectra at all the epochs.
| Model | Parameter | X1 | X2 | X3 | S1 | C1 |
|---|---|---|---|---|---|---|
| constant | CMOS | 0.9 ± 0.1 | 0.93 ± 0.05 | 1.04 ± 0.05 | - | - |
| CXRT or CACIS | - | - | - | [1] | [1] | |
| TBabs | NH (1020 cm−2) | [2.6] | ||||
| slimdz | ṁ (ṁEdd) |
 |
 |
 |
0.13 ± 0.04 | 0.10 ± 0.02 |
| θ (°) | < 30 | |||||
| M• (M⊙) |
 |
|||||
| a• | > 0.96 | |||||
| C-stat/d.o.f. | 136.9/124 | |||||
Notes. The fit function is "constant*TBabs*slimdz". Values held fixed during the fit are given in square brackets. During the fit, the M•, a•, and θ are free–to–vary but forced to be the same at each epoch. Due to low number of photons detected at S1 and C1, it is not possible to simultaneously constrain the renormalisation factor (CXRT and CACIS) and ṁ. Thus we fix CXRT and CACIS to unity, assuming different instruments are well cross–calibrated. The expected C-stat is calculated to be Ce≈135, with a root–mean–square (RMS) of ≈16. We find that the X–ray spectra of J1231 at all epochs can be well explained by a slim disc model varying only the mass accretion rate ṁ.
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