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Acciari, V A; Barres de Almeida, U; Becerra González, J; Bednarek, W; Bigongiari, C; Biland, A; Covino, S; De Lotto, B; Delgado Mendez, C; Donini, A; Elsaesser, D; Garczarczyk, M; Green, J G; Hrupec, D; Imazawa, R; Jormanainen, J; Kerszberg, D; Kobayashi, Y; Lamastra, A; López-Oramas, A; Majumdar, P; Mannheim, K; Mazin, D; Mićanović, S; Morcuende, D; Nanci, C; Nilsson, K; Nishijima, K; Njoh Ekoume, T; Ohtani, Y; Podobnik, F; Rhode, W; Ribó, M; Saito, T; Schubert, J L; Strom, D; Surić, T; Tajima, H; Teshima, M; Ventura, S; Vitale, V; Abdalla, H; Aharonian, F; Bernlöhr, K; Boisson, C; Brun, F; Cangemi, F; Chandra, S; Chibueze, O U; Devin, J; Djannati-Ataï, A; Egberts, K; Ernenwein, J-P; Glicenstein, J F; Grolleron, G; Holler, M; Jamrozy, M; Katz, U; Kluźniak, W; Kostunin, D; Lohse, T; Lypova, I; Malyshev, D; Martí-Devesa, G; Murach, T; Olivera-Nieto, L; Ostrowski, M; Poireau, V; Prokhorov, D A; Reichherzer, P; Salzmann, H; Santangelo, A; Schüssler, F; Schwanke, U; Shapopi, J N S; Spencer, S; Stawarz, Ł; Tsuji, N; Uchiyama, Y; Vecchi, M; Vink, J; Zdziarski, A A; Zhu, S J; Zouari, S; Acharyya, A; Adams, C B; Benbow, W; Capasso, M; Foote, J M; Humensky, T B; Kherlakian, M; Kumar, S; Lundy, M; Moriarty, P; Mukherjee, R; Pueschel, E; Reynolds, P T; Weinstein, A; Bosch-Ramon, V; Russell, D M
Monthly Notices of the Royal Astronomical Society, 12/2022, Volume: 517, Issue: 4Journal Article
ABSTRACT MAXI J1820+070 is a low-mass X-ray binary with a black hole (BH) as a compact object. This binary underwent an exceptionally bright X-ray outburst from 2018 March to October, showing evidence of a non-thermal particle population through its radio emission during this whole period. The combined results of 59.5 h of observations of the MAXI J1820+070 outburst with the H.E.S.S., MAGIC and VERITAS experiments at energies above 200 GeV are presented, together with Fermi-LAT data between 0.1 and 500 GeV, and multiwavelength observations from radio to X-rays. Gamma-ray emission is not detected from MAXI J1820+070, but the obtained upper limits and the multiwavelength data allow us to put meaningful constraints on the source properties under reasonable assumptions regarding the non-thermal particle population and the jet synchrotron spectrum. In particular, it is possible to show that, if a high-energy (HE) gamma-ray emitting region is present during the hard state of the source, its predicted flux should be at most a factor of 20 below the obtained Fermi-LAT upper limits, and closer to them for magnetic fields significantly below equipartition. During the state transitions, under the plausible assumption that electrons are accelerated up to ∼500 GeV, the multiwavelength data and the gamma-ray upper limits lead consistently to the conclusion that a potential HE and very-HE gamma-ray emitting region should be located at a distance from the BH ranging between 1011 and 1013 cm. Similar outbursts from low-mass X-ray binaries might be detectable in the near future with upcoming instruments such as CTA.
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