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Aharonian, F; Baghmanyan, V; Barbosa Martins, V; Becherini, Y; Böttcher, M; Bolmont, J; Breuhaus, M; Brun, F; Caroff, S; Casanova, S; Cerruti, M; Chand, T; Chen, A; Damascene Mbarubucyeye, J; Dmytriiev, A; Duffy, C; Ernenwein, J-P; Fegan, S; Feijen, K; Fichet de Clairfontaine, G; Füßling, M; Gabici, S; Ghafourizadeh, S; Giavitto, G; Giunti, L; Grondin, M-H; Hermann, G; Hinton, J A; Hofmann, W; Hoischen, C; Holch, T L; Holler, M; Jamrozy, M; Jankowsky, F; Jung-Richardt, I; Kasai, E; Katz, U; Khangulyan, D; Klepser, S; Kluźniak, W; Kostunin, D; Le Stum, S; Leuschner, F; Lohse, T; Luashvili, A; Mackey, J; Malyshev, D; Marandon, V; Marchegiani, P; Marcowith, A; Marx, R; Maurin, G; Moderski, R; Mohrmann, L; Moulin, E; Muller, J; Murach, T; de Naurois, M; Ohm, S; de Ona Wilhelmi, E; Ostrowski, M; Panter, M; Parsons, R D; Peron, G; Prokhorov, D A; Pühlhofer, G; Quirrenbach, A; Reichherzer, P; Reimer, A; Renaud, M; Rieger, F; Rowell, G; Rudak, B; Sahakian, V; Sanchez, D A; Santangelo, A; Sasaki, M; Schüssler, F; Senniappan, M; Shapopi, J N S; Simoni, R; Specovius, A; Stawarz, Ł; Steinmassl, S; Steppa, C; Taylor, A M; Terrier, R; Tsuji, N; Uchiyama, Y; van Eldik, C; van Soelen, B; Venter, C; Vink, J; Werner, F; Wong, Yu Wun; Yusafzai, A; Zacharias, M; Zargaryan, D; Zhu, S J; Zouari, S
Science (American Association for the Advancement of Science), 04/2022, Letnik: 376, Številka: 6588Journal Article
Recurrent novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to the accretion of fresh material from a binary companion. The shock generated when ejected material slams into the companion star's wind can accelerate particles. We report very-high-energy (VHE; Formula: see text) gamma rays from the recurrent nova RS Ophiuchi, up to 1 month after its 2021 outburst, observed using the High Energy Stereoscopic System (H.E.S.S.). The temporal profile of VHE emission is similar to that of lower-energy giga-electron volt emission, indicating a common origin, with a 2-day delay in peak flux. These observations constrain models of time-dependent particle energization, favoring a hadronic emission scenario over the leptonic alternative. Shocks in dense winds provide favorable environments for efficient acceleration of cosmic rays to very high energies.
