Ajello M, Paliya V, Marcotulli L, Perkins JS, Prandini E, D'Ammando F, De Angelis A, Thompson D, Li H, Dominguez A, et al. Supermassive black holes at high redshifts. [Internet]. 2019;51:289.
MeV blazars are the most luminous sources in the Universe and host supermassive black holes. An MeV survey will detect >1000 of them up to z > 5. This would allow us: to probe the formation and growth of massive black holes at high z; to pinpoint the emission region location in blazars; to determine the interplay of accretion and black hole spin.
