Table 2.
Best-fit results of GRO J1750-27 joint analysis for the joint NuSTAR and NICER (ObsID 4202350104) spectral data with different best-fit solution for the Model I (Deep and Smooth) tbabs*(bbodyrad+highecut*pow+gaussKα[+gaussbroad])*gabs, Model II tbabs*(bbodyrad+cutoffpl+gaussKα)*gabs, and Model III tbabs*(bbodyrad+bwcyc+gaussKα)*gabs (see text).
| Model I |
Model II | Model III | ||
|---|---|---|---|---|
| Deep | Smooth | Cutoffpl | BWcyc | |
| CFPMA (fixed) | 1 | 1 | 1 | 1 |
| CFPMB |
 |
 |
 |
 |
| CNICER |
 |
 |
 |
 |
| NH [1022 cm−2] |
 |
 |
 |
 |
| kTBB [keV] |
 |
 |
 |
 |
| normBB |
 |
 |
 |
 |
| EKα [keV] |
 |
 |
 |
 |
| σKα [keV] |
 |
 |
 |
 |
| normKα [10−4 ph cm−2 s−1] |
 |
 |
 |
 |
| Γ |
 |
 |
 |
– |
| normΓ ( * ) |
 |
 |
 |
– |
| HighEcut [keV] | – | – |
 |
– |
| cutoffE [keV] |
 |
 |
– | – |
| foldE |
 |
 |
– | – |
| EGauss [keV] | – |
 |
– | – |
| σGauss [keV] | – |
 |
– | – |
| NormGauss [ph cm−2 s−1] | – |
 |
– | – |
| ξ | – | – | – |
 |
| δ | – | – | – |
 |
| B [1012 G] | – | – | – | 4.62 ( ⋆ ) |
| Ṁ [1017 g s−1] | – | – | – |
 |
| Te [keV] | – | – | – |
 |
| r0 [m] | – | – | – |
 |
| d [kpc] | – | – | – | 14.0 (fixed) |
| normbwcyc | – | – | – |
 |
| Ecyc [keV] |
 |
 |
 |
 |
| σcyc [keV] |
 |
 |
 |
 |
| Strengthcyc ( ‡ ) (τcyc ( ‡ ) [keV]) |
 |
 |
 |
 |
| Flux ( † ) (1–60 keV) |
 |
 |
 |
 |
| χ2/d.o.f. | 3156/3395 | 3308/3392 | 3364/3396 | 3435/3393 |
| Goodness-of-fit | 44% | 45% | 40% | 45% |
| Null-hypothesis P | 70% | 85% | 68% | 28% |
Notes. All reported errors are at 1σ c.l. and based on the MCMC chain values. ( * )In units of photons keV−1 cm−2 s−1 at 1 keV. ( ⋆ )Linked to the Ecyc parameter (see text). ( ‡ )Line depth (optical depth) as defined in XSPEC. ( † )Unabsorbed flux calculated for the entire model (in units of 10−9 erg cm−2 s−1), obtained using the cflux model from XSPEC as resulting from FPMA.
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