Ajello, MarcoMarcoAjelloPaliya, VaidehiVaidehiPaliyaMarcotulli, LeaLeaMarcotulliPerkins, Jeremy S.Jeremy S.PerkinsPRANDINI, ELISAELISAPRANDINID'AMMANDO, FILIPPOFILIPPOD'AMMANDODE ANGELIS, ALESSANDROALESSANDRODE ANGELISThompson, DavidDavidThompsonLI, HUIHUILIDominguez, AlbertoAlbertoDominguezBeckmann, VolkerVolkerBeckmannGuiriec, SylvainSylvainGuiriecWadiasingh, ZorawarZorawarWadiasinghCoppi, PaoloPaoloCoppiHarding, J. PatrickJ. PatrickHardingPetropoulou, MariaMariaPetropoulouHewitt, John W.John W.HewittOjha, RoopeshRoopeshOjhaMarcowith, AlexandreAlexandreMarcowithDORO, MICHELEMICHELEDOROCastro, DanielDanielCastroBaring, MatthewMatthewBaringHays, ElizabethElizabethHaysORLANDO, ELENAELENAORLANDOBozhilov, VladimirVladimirBozhilovTomsick, JohnJohnTomsickAgudo, IvanIvanAgudoVenters, ToniaToniaVentersMcEnery, JulieJulieMcEneryThe, Lih-SinLih-SinTheHartmann, DieterDieterHartmannBuson, SaraSaraBusonLongo, FrancescoFrancescoLongoGASPARRINI, DarioDarioGASPARRINI2020-12-302020-12-3020192330-9458http://hdl.handle.net/20.500.12386/29325MeV 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.ELETTRONICOenArticlehttps://baas.aas.org/pub/2020n3i289/release/12019BAAS...51c.289AFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation