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Fig. 6.


Panel a: observed period of the SMBHB system in years as a function of the primary mass fraction and of the decadic logarithm of the orbital separation of the black holes in milliparsecs. The considered total black hole mass is Mtot = 3 × 108M according to Padovani et al. (2019). The plot represents the complete parameter space in terms of that would yield the observed disk-jet precession period of 10 yr. Panel b: color-coded merger timescale in years as a function of the primary black hole mass ratio xp and of the decadic logarithm of the mutual component distance rps in milliparsecs. The whole parameter space (xp, rps) is shown that yields merger timescales longer than the source-frame SMBHB orbital period, τmerge >  Pps.

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