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Table 1.
Parameters and prior ranges used for the fitting.
| Parameters | Ranges | Description |
|---|---|---|
| i | [90, 180°] | Viewing angle (inclination) of the observer: i = 0° is face-on, i = 90° is edge-on |
| a* | [0.0, 0.9] | Dimensionless black hole spin |
| n0, s | [104, 108] | Electron number density at the center of the spot (cm−3) |
| Θ0, s | [1, 103] | Electron dimensionless temperature at the center of the spot |
| B0, s | [0.1, 102] | Magnetic field strength (G) |
| rs | [7, 15] | Distance of the center of the spot from black hole center (M) |
| ϕcam | [0, 360°] | Location of the camera at the first point of observation (shifts light curves left-right) |
| Qsha | [ − 1, 1] | Average background Stokes Q parameter (Jy) |
| Usha | [ − 1, 1] | Average background Stokes U parameter (Jy) |
| PA | [ − 90° ,90°] | Position angle of the black hole spin projected on the observer’s screen, measured east of north |
| Ccoef | [10−5, 10−3] | Coefficient for the exponential cooling (M−1) |
| Kcoef | [0.5, 1.2] | Coefficient defining the orbital velocity with respect to the Keplerian case |
Notes. All priors are flat, except for n0, s, Θ0, s, B0, s, Ccoef, where we used truncated log-normal priors centered in the middle of the corresponding ranges.
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