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A ring-like accretion structure in M87 connecting its black hole and jet.

Ru-Sen LuKeiichi AsadaThomas P KrichbaumJongho ParkFumie TazakiHung-Yi PuMasanori NakamuraAndrei LobanovKazuhiro HadaKazunori AkiyamaJae-Young KimIvan Marti-VidalJosé L GómezTomohisa KawashimaFeng YuanEduardo RosWalter AlefSilke BritzenMichael BremerAvery E BroderickAkihiro DoiGabriele GiovanniniMarcello GirolettiPaul T P HoMareki HonmaDavid H HughesMakoto InoueWu JiangMotoki KinoShoko KoyamaMichael LindqvistJun LiuAlan P MarscherSatoki MatsushitaHiroshi NagaiHelge RottmannTuomas SavolainenKarl-Friedrich SchusterZhi-Qiang ShenPablo de VicenteR Craig WalkerHai YangJ Anton ZensusJuan Carlos AlgabaAlexander AllardiUwe BachRyan BertholdDan BintleyDo-Young ByunCarolina CasadioShu-Hao ChangChih-Cheng ChangSong-Chu ChangChung-Chen ChenMing-Tang ChenRyan ChilsonTim C ChuterJohn ConwayGeoffrey B CrewJessica T DempseySven DornbuschAaron FaberPer FribergJavier González GarcíaMiguel Gómez GarridoChih-Chiang HanKuo-Chang HanYutaka HasegawaRuben Herrero-IllanaYau-De HuangChih-Wei L HuangViolette ImpellizzeriHomin JiangHao JinchiTaehyun JungJuha KallunkiPetri KirvesKimihiro KimuraJun Yi KoayPatrick M KochCarsten KramerAlex KrausDerek KuboCheng-Yu KuoChao-Te LiLupin Chun-Che LinChing-Tang LiuKuan-Yu LiuWen-Ping LoLi-Ming LuNicholas MacDonaldPierre Martin-CocherHugo MessiasZheng Meyer-ZhaoAnthony MinterDhanya G NairHiroaki NishiokaTimothy J NortonGeorge NystromHideo OgawaPeter OshiroNimesh A PatelUe-Li PenYurii PidopryhoraNicolas PradelPhilippe A RaffinRamprasad RaoIgnacio RuizSalvador SanchezPaul ShawWilliam SnowT K SridharanRanjani SrinivasanBelén TerceroPablo TorneEfthalia TraianouJan WagnerCraig WaltherTa-Shun WeiJun YangChen-Yu Yu
Published in: Nature (2023)
The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation 1,2 . Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole 3 . Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of [Formula: see text] Schwarzschild radii in diameter, approximately 50% larger than that seen at 1.3 mm. The outer edge at 3.5 mm is also larger than that at 1.3 mm. This larger and thicker ring indicates a substantial contribution from the accretion flow with absorption effects, in addition to the gravitationally lensed ring-like emission. The images show that the edge-brightened jet connects to the accretion flow of the black hole. Close to the black hole, the emission profile of the jet-launching region is wider than the expected profile of a black-hole-driven jet, suggesting the possible presence of a wind associated with the accretion flow.
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