Abstract. Theoretical reflections suggest supermassive binary black holes (BBHs) should be common in the Universe. In the bottom-up scenario of galaxy formation supermassive BBHs should result from galaxy mergers of galaxies which each harbor one supermassive black hole. The estimated number of supermassive BBHs should be relevantly high [e.g. Volonteri et al., 2003]. However, the orbital periods of surviving BBHs are generally too long. In the mass ratio/period plane there is only a small region of large mass ratios (of about 100) and short orbital periods (of about tens of years) of surviving BBHs [Yu, 2002]. We want to search for blazars that fit this region through historical light curves gathering (using historical data archives, e.g. SAO etc.) and their consequent analysis. We expect to find more blazars similar to a wellestablished supermassive BBH, OJ 287, the model of which we also present
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