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  • A ring-like accretion structure in M87 connecting its black hole and jet
    Ru-Sen, Lu; Asada, Keiichi; Krichbaum, Thomas P; Park, Jongho; Tazaki, Fumie; Hung-Yi, Pu; Nakamura, Masanori; Lobanov, Andrei; Hada, Kazuhiro; Akiyama, Kazunori; Jae-Young, Kim; Gómez, José L; Kawashima, Tomohisa; Yuan, Feng; Ros, Eduardo; Alef, Walter; Britzen, Silke; Bremer, Michael; Broderick, Avery E; Doi, Akihiro; Giovannini, Gabriele; Giroletti, Marcello; Ho, Paul T P; Honma, Mareki; Hughes, David H; Inoue, Makoto; Wu, Jiang; Kino, Motoki; Koyama, Shoko; Lindqvist, Michael; Marscher, Alan P; Matsushita, Satoki; Nagai, Hiroshi; Rottmann, Helge; Schuster, Karl-Friedrich; de Vicente, Pablo; Walker, R Craig; J Anton Zensus; Algaba, Juan Carlos; Allardi, Alexander; Ryan, Berthold; Do-Young, Byun; Casadio, Carolina; Shu-Hao, Chang; Chih-Cheng, Chang; Ming-Tang, Chen; Chilson, Ryan; Chuter, Tim C; Crew, Geoffrey B; Dornbusch, Sven; Faber, Aaron; Friberg, Per; Javier González García; Kuo-Chang, Han; Hasegawa, Yutaka; Huang, Chih-Wei L; Impellizzeri, Violette; Jiang, Homin; Hao Jinchi; Jung, Taehyun; Kallunki, Juha; Kirves, Petri; Kimura, Kimihiro; Jun Yi Koay; Koch, Patrick M; Kramer, Carsten; Kraus, Alex; Chao-Te, Li; Lupin Chun-Che Lin; Kuan-Yu, Liu; Wen-Ping Lo; Li-Ming, Lu; Martin-Cocher, Pierre; Messias, Hugo; Meyer-Zhao, Zheng; Minter, Anthony; Nair, Dhanya G; Nishioka, Hiroaki; Norton, Timothy J; Nystrom, George; Ogawa, Hideo; Oshiro, Peter; Patel, Nimesh A; Ue-Li Pen; Pradel, Nicolas; Raffin, Philippe A; Rao, Ramprasad; Ruiz, Ignacio; Sanchez, Salvador; Shaw, Paul; Snow, William; Sridharan, T K; Srinivasan, Ranjani; Tercero, Belén; Torne, Pablo; Traianou, Efthalia; Wagner, Jan; Walther, Craig; Ta-Shun, Wei; Yang, Jun

    arXiv.org, 04/2023
    Paper, Journal Article

    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 8.4_{-1.1}^{+0.5} 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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