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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Nature, Volume 616, issue 7958
The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. 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 hole3. 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.
Publisher Copyright: © 2023. The Author(s).
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Lu, R S, Asada, K, Krichbaum, T P, Park, J, Tazaki, F, Pu, H Y, Nakamura, M, Lobanov, A, Hada, K, Akiyama, K, Kim, J Y, Marti-Vidal, I, Gómez, J L, Kawashima, T, Yuan, F, Ros, E, Alef, W, Britzen, S, Bremer, M, Broderick, A E, Doi, A, Giovannini, G, Giroletti, M, Ho, P T P, Honma, M, Hughes, D H, Inoue, M, Jiang, W, Kino, M, Koyama, S, Lindqvist, M, Liu, J, Marscher, A P, Matsushita, S, Nagai, H, Rottmann, H, Savolainen, T, Schuster, K F, Shen, Z Q, de Vicente, P, Walker, R C, Yang, H, Zensus, J A, Algaba, J C, Allardi, A, Bach, U, Berthold, R, Bintley, D, Byun, D Y, Casadio, C, Chang, S H, Chang, C C, Chang, S C, Chen, C C, Chen, M T, Chilson, R, Chuter, T C, Conway, J, Crew, G B, Dempsey, J T, Dornbusch, S, Faber, A, Friberg, P, García, J G, Garrido, M G, Han, C C, Han, K C, Hasegawa, Y, Herrero-Illana, R, Huang, Y D, Huang, C W L, Impellizzeri, V, Jiang, H, Jinchi, H, Jung, T, Kallunki, J, Kirves, P, Kimura, K, Koay, J Y, Koch, P M, Kramer, C, Kraus, A, Kubo, D, Kuo, C Y, Li, C T, Lin, L C C, Liu, C T, Liu, K Y, Lo, W P, Lu, L M, MacDonald, N, Martin-Cocher, P, Messias, H, Meyer-Zhao, Z, Minter, A, Nair, D G, Nishioka, H, Norton, T J, Nystrom, G, Ogawa, H, Oshiro, P, Patel, N A, Pen, U L, Pidopryhora, Y, Pradel, N, Raffin, P A, Rao, R, Ruiz, I, Sanchez, S, Shaw, P, Snow, W, Sridharan, T K, Srinivasan, R, Tercero, B, Torne, P, Traianou, E, Wagner, J, Walther, C, Wei, T S, Yang, J & Yu, C Y 2023, ' A ring-like accretion structure in M87 connecting its black hole and jet ', Nature, vol. 616, no. 7958, pp. 686-690 . https://doi.org/10.1038/s41586-023-05843-w