Table 2.
Best-fit parameters of the broadband continuum model components for NGC 3227, derived from modelling the 2016 and 2019 observations.
| Parameter | Value |
|---|---|
| Disk blackbody component for NIR-optical-UV continuum (dbb): | |
| Normalisation A | 7.3 (2016, fixed) |
| 4.0 ± 0.2 (2019) | |
| Tmax (eV) | 10.2 (2016, coupled) |
| 10.2 ± 0.2 (2019) | |
| Warm Comptonisation component for ‘soft X-ray excess’ (comt): | |
| Normalisation | 5.9 ± 0.1 (2016) |
| 1.3 ± 0.1 (2019) | |
| Tseed (eV) | 10.2 (coupled) |
| Te (keV) | 0.10 ± 0.01 (2016) |
| 0.10 (2019, coupled) | |
| Optical depth τ | 30 (fixed) |
| Primary X-ray power-law component (pow): | |
| Normalisation | 38.7 ± 0.1 (2016) |
| 6.4 ± 0.1 (2019) | |
| Photon index Γ | 1.83 ± 0.02 (2016) |
| 1.70 ± 0.03 (2019) | |
| X-ray reflection component (refl): | |
| Incident power-law Norm. | 38.7 (coupled) |
| Incident power-law Γ | 1.83 (coupled) |
| Reflection scale s | 0.61 ± 0.02 (2016) |
| 0.25 ± 0.02 (2019) | |
| C-stat / expected C-stat = 4085/3272 (2016) | |
| C-stat / expected C-stat = 3891/3487 (2019) | |
Notes. The disk blackbody dbb normalisation is in 1026 cm2. The normalisation of the 2016 dbb component is fixed at a factor of 1.82 larger than that of the 2019 dbb component based on the observed OM UVW1 fluxes. The power-law normalisation of the pow and refl components is in units of 1049 photons s−1 keV−1 at 1 keV. The normalisation of the Comptonisation component (comt) is in units of 1053 photons s−1 keV−1. The high-energy exponential cut-off of the power-law for both pow and refl is fixed to 309 keV. The seed photon temperature Tseed of comt is coupled to the maximum temperature Tmax of dbb. The normalisation of the incident power-law for the reflection component (refl) is coupled to that of the observed primary power-law continuum (pow). The intrinsic bolometric luminosity of each continuum component is as follows. For the 2016 observation: dbb: 3.4 × 1043 erg s−1; comt: 5.1 × 1042 erg s−1; pow: 7.1 × 1042 erg s−1; refl: 1.3 × 1042 erg s−1. For the 2019 observation: dbb: 1.9 × 1043 erg s−1; comt: 1.1 × 1042 erg s−1; pow: 1.6 × 1042 erg s−1; refl: 5.4 × 1041 erg s−1.
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