On the need of an ultramassive black hole in OJ 287

Abstract The highly variable blazar OJ 287 is commonly discussed as an example of a binary black hole system. 130 year long optical light curve well explained by model where the central body massive 18.35× 109 solar mass that supports thin accretion disc. secondary 0.15× impacts disc twice during its 12 orbit, and causes observable flares. Recently, it has been argued with typical AGN rate above mentioned should be at least six magnitudes brighter than 287’s host galaxy would therefore observationally excluded. Based on observations radio jet, detailed in Marscher Jorstad (2011), up-to-date models Azadi et al. (2022), we show V-band magnitude unlikely to exceed brightness more one magnitude, could fainter host. This because power necessary launch jet create electromagnetic radiation, distributed across many wavelengths, not concentrated especially V-band. Further, note claimed concentration leads serious problems while interpreting other Active Galactic Nuclei. Therefore, infer primary do need smaller what determined standard for 287.