Dey, LankeswarLankeswarDeyValtonen, M. J.M. J.ValtonenGopakumar, A.A.GopakumarZola, S.S.ZolaHudec, R.R.HudecPihajoki, P.P.PihajokiCiprini, S.S.CipriniMatsumoto, K.K.MatsumotoSadakane, K.K.SadakaneKidger, M.M.KidgerNilsson, K.K.NilssonMikkola, S.S.MikkolaSillanpää, A.A.SillanpääTakalo, L. O.L. O.TakaloLehto, H. J.H. J.LehtoBerdyugin, A.A.BerdyuginPiirola, V.V.PiirolaJermak, H.H.JermakBaliyan, K. S.K. S.BaliyanPursimo, T.T.PursimoCaton, D. B.D. B.CatonAlicavus, F.F.AlicavusBaransky, A.A.BaranskyBlay, P.P.BlayBoumis, P.P.BoumisBoyd, D.D.BoydCampas Torrent, M.M.Campas TorrentCampos, F.F.CamposCarrillo Gómez, J.J.Carrillo GómezChandra, S.S.ChandraChavushyan, V.V.ChavushyanDalessio, J.J.DalessioDebski, B.B.DebskiDrozdz, M.M.DrozdzEr, H.H.ErErdem, A.A.ErdemEscartin Pérez, A.A.Escartin PérezFallah Ramazani, V.V.Fallah RamazaniFilippenko, A. V.A. V.FilippenkoGafton, E.E.GaftonGanesh, S.S.GaneshGarcia, F.F.GarciaGazeas, K.K.GazeasGodunova, V.V.GodunovaGómez Pinilla, F.F.Gómez PinillaGopinathan, M.M.GopinathanHaislip, J. B.J. B.HaislipHarmanen, J.J.HarmanenHurst, G.G.HurstJaník, J.J.JaníkJelinek, M.M.JelinekJoshi, A.A.JoshiKagitani, M.M.KagitaniKarjalainen, R.R.KarjalainenKaur, N.N.KaurKeel, W. C.W. C.KeelKouprianov, V. V.V. V.KouprianovKundera, T.T.KunderaKurowski, S.S.KurowskiKvammen, A.A.KvammenLaCluyze, A. P.A. P.LaCluyzeLee, B. C.B. C.LeeLiakos, A.A.LiakosLindfors, E.E.LindforsLozano de Haro, J.J.Lozano de HaroMugrauer, M.M.MugrauerNaves Nogues, R.R.Naves NoguesNeely, A. W.A. W.NeelyNelson, R. H.R. H.NelsonOgloza, W.W.OglozaOkano, S.S.OkanoPajdosz-Śmierciak, U.U.Pajdosz-ŚmierciakPandey, J. C.J. C.PandeyPERRI, MatteoMatteoPERRIPoyner, G.G.PoynerProvencal, J.J.ProvencalRaj, A.A.RajReichart, D. E.D. E.ReichartReinthal, R.R.ReinthalReynolds, T.T.ReynoldsSaario, J.J.SaarioSadegi, S.S.SadegiSakanoi, T.T.SakanoiSalto González, J. -L.J. -L.Salto GonzálezSameerSchweyer, T.T.SchweyerSimon, A.A.SimonSiwak, M.M.SiwakSoldán Alfaro, F. C.F. C.Soldán AlfaroSonbas, E.E.SonbasSteele, I.I.SteeleStocke, J. T.J. T.StockeStrobl, J.J.StroblTomov, T.T.TomovTremosa Espasa, L.L.Tremosa EspasaValdes, J. R.J. R.ValdesValero Pérez, J.J.Valero PérezVERRECCHIA, FrancescoFrancescoVERRECCHIAVasylenko, V.V.VasylenkoWebb, J. R.J. R.WebbYoneda, M.M.YonedaZejmo, M.M.ZejmoZheng, W.W.ZhengZielinski, P.P.Zielinski2021-02-082021-02-0820180004-637Xhttp://hdl.handle.net/20.500.12386/30217Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the binary black hole (BBH) central engine of blazar OJ 287 demand the inclusion of gravitational radiation reaction effects beyond the quadrupolar order. It turns out that even the effects of certain hereditary contributions to GW emission are required to predict impact flare timings of OJ 287. We develop an approach that incorporates this effect into the BBH model for OJ 287. This allows us to demonstrate an excellent agreement between the observed impact flare timings and those predicted from ten orbital cycles of the BBH central engine model. The deduced rate of orbital period decay is nine orders of magnitude higher than the observed rate in PSR 1913+16, demonstrating again the relativistic nature of OJ 287's central engine. Finally, we argue that precise timing of the predicted 2019 impact flare should allow a test of the celebrated black hole “no-hair theorem” at the 10% level.STAMPAenArticle10.3847/1538-4357/aadd952-s2.0-85055252909000446752400011https://iopscience.iop.org/article/10.3847/1538-4357/aadd952018ApJ...866...11DFIS/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::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos