Table 1.
Model parameters and their range of values used in simulations.
| Parameters | Description | Range or monotony | Values in simulations |
|---|---|---|---|
| (M1, M2) | SMBHs masses in 107 M⊙ | (6, 4) | |
| q |
 |
(0,1) |
 |
| 𝒜0 | Semimajor axis of SMBHs relative orbit [ld] | (100, 175) | |
| (a1, a2) | SMBHs semimajor axes | ( ) |
|
| (e1 = e2) | SMBHs orbital barycentric eccentricities | (0,1) | (0.05, 0.5) |
| (i1, i2) | SMBHs orbital barycentric inclinations (a) | (0° , 45° ) | |
| (Ωk, ωk, k = 1, 2) | Longitude of ascending node and | (0° , 360°) | (0° ,360° ) |
| Argument of pericentre of SMBHs barycentric orbits | |||
| (fk, k = 1, 2) | True anomaly of SMBHs orbits | (0° , 360°) | (0° ,90° ,180° ) |
( ) |
Semimajor axes of clouds orbits | ((20, 40), (16, 32)) | |
| in BLRs around SMBHs [ld] | |||
( ) |
Clouds’ orbital eccentricities | (0,1) | (0.05, 0.5), Γs(0.3, 1), ℛ(1) |
( ) |
Clouds’ orbital inclinations | (0° ,45° ) ∨ (90° ,175°) (b) | |
( ,  ) |
Longitude of ascending node and | (0° ,360° ) | (0° ,360° ) |
| Argument of pericentre of cloud orbits | |||
| Auxiliary parameters | |||
| ℑ | Varied range of clouds’ orbital inclinations |
 |
|
| Within single simulation | |||
| i0 | Angular position of the observer | (0° ,45°) | |
| Jbin | CB-SMBH angular momentum | Jbin ≶ 0 | Jbin > 0 |
 |
BLRs angular momenta |
 |
 |
Notes.
Degeneration of barycentric orbits can arise for different reasons, such as third body gravitational interaction known to be significant in some cases, quadrupole or relativistic precession. We take into account non-coplanar CB-SMBHs as one of the degenerate cases. However, the latter two effects are irrelevant for qualitative orbital characteristics at short observational time scales. In any situation, there is the freedom to select the coordinate system so that the parameterisation is convenient and reasonable (Klioner 2003).
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