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Table 3
Summary of the spectral features (other than narrow emission lines) and best-fit parameters used to model the stacked spectrum of Ark 564, resulting in a final χ2/ d.o.f. = 5178/3034.
| Feature | Parameter | Status | Value |
|
|
|||
| Galactic absorption (cold phase) | |||
| nh, column density (1024 m-2) | frozen | 5.34 | |
| Temperature (10-4 keV) | frozen | 5.0 | |
| rms Turbulence (km s-1) | thawn | 21 ± 5 | |
|
|
|||
| Galactic absorption (warm phase) | |||
| nh, column density (1023 m-2) | thawn | 2.5 ± 0.6 | |
| Temperature (keV) | thawn | 0.15 ± 0.01 | |
| rms turbulence (km s-1) | thawn | 36 ± 15 | |
|
|
|||
Radiative recombination (O VIII  O VII) |
|||
| Emission strength (1064 m-3) | thawn | 4400 ± 400 | |
| Temperature (10-3 keV) | thawn | 9.5 ± 0.8 | |
| Doppler shift (10-3) | thawn | −2.7 ± 0.6 | |
| Doppler velocity (km s-1) | thawn | −800 ± 200 | |
|
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|||
| Broad relativistic lines | |||
| O VIII Lyα (1050 ph s-1) | thawn | 4.4 ± 0.6 | |
| N VII Lyα (1050 ph s-1) | thawn | 21.0 ± 2.0 | |
| Inner radius Rin (GM/c2) | thawn | 10 |
|
| Emissivity index q | thawn | 1.83 ± 0.05 | |
| Inclination i | thawn | 37° ± 0.5° | |
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