Broadband Multi-wavelength Properties of M87 during the 2018 EHT Campaign including a Very High Energy Flaring Episode
Creators: name: Algaba, J. C.
name: Baloković, M.
name: Chandra, S.
name: Cheong, W.-Y.
name: Cui, Y.-Z.
name: D'Ammando, F.
name: Falcone, A. D.
name: Ford, N. M.
name: Giroletti, M.
name: Goddi, C.
name: Gurwell, M. A.
name: Hada, K.
name: Haggard, D.
name: Jorstad, S.
name: Kaur, A.
name: Kawashima, T.
name: Kerby, S.
name: Kim, J.-Y.
name: Kino, M.
name: Kravchenko, E. V.
name: Lee, S.-S.
name: Lu, R.-S.
name: Markoff, S.
name: Michail, J.
name: Neilsen, J.
name: Nowak, M. A.
name: Principe, G.
name: Ramakrishnan, V.
name: Ripperda, B.
name: Sasada, M.
name: Savchenko, S. S.
name: Sheridan, C.
name: Akiyama, K.
name: Alberdi, A.
name: Alef, W.
name: Anantua, R.
name: Asada, K.
name: Azulay, R.
name: Bach, U.
name: Baczko, A.-K.
name: Balles, Andreas
name: Bandyopadhyay, B.
name: Barrett, J.
name: Bauböck, M.
name: Benson, B. A.
name: Bintley, D.
name: Blackburn, L.
name: Blundell, R.
name: Bouman, K. L.
name: Bower, G. C.
name: Boyce, H.
name: Bremer, M.
name: Brissenden, R.
name: Britzen, S.
name: Broderick, A. E.
name: Broguiere, D.
name: Bronzwaer, T.
name: Bustamante, S.
name: Carlstrom, J. E.
name: Chael, A.
name: Chan, C.-k.
name: Chang, D. O.
name: Chatterjee, K.
name: Chatterjee, S.
name: Chen, M.-T.
name: Chen, Y.
name: Cheng, X.
name: Cho, I.
name: Christian, P.
name: Conroy, N. S.
name: Conway, J. E.
name: Crawford, T. M.
name: Crew, G. B.
name: Cruz-Osorio, A.
name: Dahale, R.
name: Davelaar, J.
name: De Laurentis, M.
name: Deane, R.
name: Dempsey, J.
name: Desvignes, G.
name: Dexter, J.
name: Dhruv, V.
name: Dihingia, I. K.
name: Doeleman, S. S.
name: Dzib, S. A.
name: Eatough, R. P.
name: Emami, R.
name: Falcke, H.
name: Farah, J.
name: Fish, V. L.
name: Fomalont, E.
name: Ford, H. A.
name: Foschi, M.
name: Fraga-Encinas, R.
name: Freeman, W. T.
name: Friberg, P.
name: Fromm, C. M.
name: Fuentes, A.
name: Galison, P.
name: Gammie, C. F.
name: García, R.
name: Gentaz, O.
name: Georgiev, B.
name: Gold, R.
name: Gómez-Ruiz, A. I.
name: Gómez, J. L.
name: Gu, M.
name: Hesper, R.
name: Heumann, D.
name: Ho, L. C.
name: Ho, P.
name: Honma, M.
name: Huang, C.-W. L.
name: Huang, L.
name: Hughes, D. H.
name: Ikeda, S.
name: Impellizzeri, C. M. V.
name: Inoue, M.
name: Issaoun, S.
name: James, D. J.
name: Jannuzi, B. T.
name: Janssen, M.
name: Jeter, B.
name: Jiang, W.
name: Jiménez-Rosales, A.
name: Johnson, M. D.
name: Jones, A. C.
name: Joshi, A. V.
name: Jung, T.
name: Karuppusamy, R.
name: Keating, G. K.
name: Kettenis, M.
name: Kim, D.-J.
name: Kim, J.
name: Kim, J.
name: Koay, J. Y.
name: Kocherlakota, P.
name: Kofuji, Y.
name: Koch, P. M.
name: Koyama, S.
name: Kramer, C.
name: Kramer, J. A.
name: Kramer, M.
name: Krichbaum, T. P.
name: Kuo, C.-Y.
name: La Bella, N.
name: Levis, A.
name: Li, Z.
name: Lico, R.
name: Lindahl, G.
name: Lindqvist, M.
name: Lisakov, M.
name: Liu, J.
name: Liu, K.
name: Liuzzo, E.
name: Lo, W.-P.
name: Lobanov, A. P.
name: Loinard, L.
name: Lonsdale, C. J.
name: Lowitz, A. E.
name: MacDonald, N. R.
name: Mao, J.
name: Marchili, N.
name: Marrone, D. P.
name: Marscher, A. P.
name: Martí-Vidal, I.
name: Matsushita, S.
name: Matthews, L. D.
name: Medeiros, L.
name: Menten, K. M.
name: Mizuno, I.
name: Mizuno, Y.
name: Montgomery, J.
name: Moran, J. M.
name: Moriyama, K.
name: Moscibrodzka, M.
name: Mulaudzi, W.
name: Müller, C.
name: Müller, H.
name: Mus, A.
name: Musoke, G.
name: Myserlis, I.
name: Nagai, H.
name: Nagar, N. M.
name: Nair, D. G.
name: Nakamura, M.
name: Narayanan, G.
name: Natarajan, I.
name: Nathanail, A.
name: Fuentes, S. Navarro
name: Ni, C.
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name: Olivares, H.
name: Oyama, T.
name: Özel, F.
name: Palumbo, D. C. M.
name: Filippos Paraschos, G.
name: Park, J.
name: Parsons, H.
name: Patel, N.
name: Pen, U.-L.
name: Pesce, D. W.
name: Piétu, V.
name: PopStefanija, A.
name: Porth, O.
name: Prather, B.
name: Psaltis, D.
name: Pu, H.-Y.
name: Rao, R.
name: Rawlings, M. G.
name: Raymond, A. W.
name: Rezzolla, L.
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name: Roelofs, F.
name: Romero-Cañizales, C.
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name: Ruiz, I.
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name: Sánchez, S.
name: Sánchez-Argüelles, D.
name: Sánchez-Portal, M.
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name: Schuster, K.-F.
name: Shao, L.
name: Shen, Z.
name: Small, D.
name: Sohn, B. W.
name: SooHoo, J.
name: Salas, L. D. Sosapanta
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name: Stanway, J. S.
name: Sun, H.
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name: Tiede, P.
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name: Torne, P.
name: Toscano, T.
name: Traianou, E.
name: Trent, T.
name: Trippe, S.
name: Turk, M.
name: van Bemmel, I.
name: van Langevelde, H. J.
name: van Rossum, D. R.
name: Vos, J.
name: Wagner, J.
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name: Wardle, J.
name: Washington, J. E.
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name: Wong, G. N.
name: Wu, Q.
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name: Yamaguchi, P.
name: Yfantis, A.
name: Yoon, D.
name: Young, A.
name: Younsi, Z.
name: Yu, W.
name: Yuan, F.
name: Yuan, Y.-F.
name: Zensus, J. A.
name: Zhang, S.
name: Zhao, G.-Y.
name: Zhao, S.-S.
name: Bellazzini, R.
name: Berenji, B.
name: Bissaldi, E.
name: Blandford, R. D.
name: Bonino, R.
name: Bruel, P.
name: Cameron, R. A.
name: Caraveo, P. A.
name: Cavazzuti, E.
name: Cheung, C. C.
name: Ciprini, S.
name: Orestano, P. Cristarella
name: Cutini, S.
name: Di Lalla, N.
name: Dinesh, A.
name: Di Venere, L.
name: Domínguez, A.
name: Fegan, S. J.
name: Franckowiak, A.
name: Fukazawa, Y.
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name: Kluźniak, W.
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name: Cui, L.
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name: Zhang, H.
name: Zhao, R.
name: Zhong, W.
name: Event Horizon Telescope Collaboration
name: Fermi Large Area Telescope Collaboration
name: H. E. S. S. Collaboration
name: MAGIC Collaboration
name: VERITAS Collaboration
name: EAVN Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024
Subjects: subject: 520
subject: gamma ray: VHE
subject: particle: acceleration
subject: emission: model
subject: black hole: accretion
subject: gamma ray: energy
subject: X-ray: flux
subject: spectral energy distribution
subject: horizon
subject: spectral
subject: monitoring
subject: GeV
subject: general relativity
subject: imaging
subject: galaxy
subject: cluster
subject: black hole: mass
subject: jet
subject: gamma ray: flux
subject: radio wave
subject: ultraviolet

description: The nearby elliptical galaxy M87 contains one of the only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL) facilities (from radio to gamma-ray energies) took part in the second M87 EHT campaign. The goal of this extensive MWL campaign was to better understand the physics of the accreting black hole M87*, the relationship between the inflow and inner jets, and the high-energy particle acceleration. Understanding the complex astrophysics is also a necessary first step towards performing further tests of general relativity. The MWL campaign took place in April 2018, overlapping with the EHT M87* observations. We present a new, contemporaneous spectral energy distribution (SED) ranging from radio to very high energy (VHE) gamma-rays, as well as details of the individual observations and light curves. We also conduct phenomenological modelling to investigate the basic source properties. We present the first VHE gamma-ray flare from M87 detected since 2010. The flux above 350 GeV has more than doubled within a period of about 36 hours. We find that the X-ray flux is enhanced by about a factor of two compared to 2017, while the radio and millimetre core fluxes are consistent between 2017 and 2018. We detect evidence for a monotonically increasing jet position angle that corresponds to variations in the bright spot of the EHT image. Our results show the value of continued MWL monitoring together with precision imaging for addressing the origins of high-energy particle acceleration. While we cannot currently pinpoint the precise location where such acceleration takes place, the new VHE gamma-ray flare already presents a challenge to simple one-zone leptonic emission model approaches, and emphasises the need for combined image and spectral modelling.