학술논문
A ring-like accretion structure in M87 connecting its black hole and jet
Document Type
Working Paper
Author
Lu, Ru-Sen; Asada, Keiichi; Krichbaum, Thomas P.; Park, Jongho; Tazaki, Fumie; Pu, Hung-Yi; Nakamura, Masanori; Lobanov, Andrei; Hada, Kazuhiro; Akiyama, Kazunori; Kim, Jae-Young; Marti-Vidal, Ivan; 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; Jiang, Wu; Kino, Motoki; Koyama, Shoko; Lindqvist, Michael; Liu, Jun; Marscher, Alan P.; Matsushita, Satoki; Nagai, Hiroshi; Rottmann, Helge; Savolainen, Tuomas; Schuster, Karl-Friedrich; Shen, Zhi-Qiang; de Vicente, Pablo; Walker, R. Craig; Yang, Hai; Zensus, J. Anton; Algaba, Juan Carlos; Allardi, Alexander; Bach, Uwe; Berthold, Ryan; Bintley, Dan; Byun, Do-Young; Casadio, Carolina; Chang, Shu-Hao; Chang, Chih-Cheng; Chang, Song-Chu; Chen, Chung-Chen; Chen, Ming-Tang; Chilson, Ryan; Chuter, Tim C.; Conway, John; Crew, Geoffrey B.; Dempsey, Jessica T.; Dornbusch, Sven; Faber, Aaron; Friberg, Per; García, Javier González; Garrido, Miguel Gómez; Han, Chih-Chiang; Han, Kuo-Chang; Hasegawa, Yutaka; Herrero-Illana, Ruben; Huang, Yau-De; Huang, Chih-Wei L.; Impellizzeri, Violette; Jiang, Homin; Jinchi, Hao; Jung, Taehyun; Kallunki, Juha; Kirves, Petri; Kimura, Kimihiro; Koay, Jun Yi; Koch, Patrick M.; Kramer, Carsten; Kraus, Alex; Kubo, Derek; Kuo, Cheng-Yu; Li, Chao-Te; Lin, Lupin Chun-Che; Liu, Ching-Tang; Liu, Kuan-Yu; Lo, Wen-Ping; Lu, Li-Ming; MacDonald, Nicholas; 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; Pen, Ue-Li; Pidopryhora, Yurii; 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; Wei, Ta-Shun; Yang, Jun; Yu, Chen-Yu
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Abstract
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.
Comment: 50 pages, 18 figures, 3 tables, author's version of the paper published in Nature
Comment: 50 pages, 18 figures, 3 tables, author's version of the paper published in Nature