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  • Radio Imaging of the Very-H...
    Acciari, V A; Bradbury, S M; Butt, Y; Cui, W; Fegan, S J; Fortin, P; Furniss, A; Gillanders, G H; Krawczynski, H; LeBohec, S; Otte, A N; Perkins, J S; Reynolds, P T; Wakely, S P; Ward, J E; Weekes, T C; Williams, D A; Hardee, P E; Ly, C; Akhperjanian, A G; Bazer-Bachi, A R; Behera, B; Bühler, R; Büsching, I; Chadwick, P M; Cheesebrough, A; Daniel, M K; Davids, I D; Dickinson, H J; Domainko, W; Drury, L O'C; Espigat, P; Feinstein, F; Göhring, D; Heinzelmann, G; Holleran, M; de Jager, O C; Katarzyński, K; Martineau-Huynh, O; Moderski, R; Naumann-Godo, M; Nolan, S J; de Oña Wilhelmi, E; Orford, K J; Pühlhofer, G; Quirrenbach, A; Raubenheimer, B C; Renaud, M; Rob, L; Santangelo, A; Schröder, R; Schwanke, U; Schwemmer, S; Sikora, M; Skilton, J L; Stawarz, Ł; Stinzing, F; Szostek, A; Tavernet, J-P; Vasileiadis, G; Venter, L; Vivier, M; Wagner, S J; Zech, A; Becker, J K; Berger, K; Bock, R K; Covino, S; Dazzi, F; De los Reyes, R; De Maria, M; Errando, M; Fonseca, M V; Galante, N; Gaug, M; Hildebrand, D; Majumdar, P; Mazin, D; Meucci, M; Miranda, J M; Mirzoyan, R; Moldón, J; Moles, M; Moralejo, A; Oya, I; Persic, M; Peruzzo, L; Prada, F; Puchades, N; Robert, A; Salvati, M; Satalecka, K; Scalzotto, V; Scapin, V; Schweizer, T; Sitarek, J; Spanier, F; Teshima, M; Torres, D F; Zapatero, J

    Science, 07/2009, Letnik: 325, Številka: 5939
    Journal Article

    The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10¹² electron volts and are bright sources of very-high-energy (VHE) γ-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy Messier 87, revealing a period of extremely strong VHE γ-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.