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https://hdl.handle.net/2440/137356
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dc.contributor.author | Abe, H. | - |
dc.contributor.author | Abe, S. | - |
dc.contributor.author | Acciari, V.A. | - |
dc.contributor.author | Aniello, T. | - |
dc.contributor.author | Ansoldi, S. | - |
dc.contributor.author | Antonelli, L.A. | - |
dc.contributor.author | Arbet Engels, A. | - |
dc.contributor.author | Arcaro, C. | - |
dc.contributor.author | Artero, M. | - |
dc.contributor.author | Asano, K. | - |
dc.contributor.author | Baack, D. | - |
dc.contributor.author | Babić, A. | - |
dc.contributor.author | Baquero, A. | - |
dc.contributor.author | De Almeida, U.B. | - |
dc.contributor.author | Barrio, J.A. | - |
dc.contributor.author | Batković, I. | - |
dc.contributor.author | Baxter, J. | - |
dc.contributor.author | Becerra González, J. | - |
dc.contributor.author | Bednarek, W. | - |
dc.contributor.author | Bernardini, E. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2022; 517(4):4736-4751 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.issn | 1365-2966 | - |
dc.identifier.uri | https://hdl.handle.net/2440/137356 | - |
dc.description.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. | - |
dc.description.statementofresponsibility | H. Abe ... G. Rowell ... et al. (The VERITAS Collaboration), V. Bosch-Ramon, C. Celma, M. Linares, D. M. Russell, and G. Sala | - |
dc.language.iso | en | - |
dc.publisher | Oxford University Press (OUP) | - |
dc.rights | © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society | - |
dc.source.uri | http://dx.doi.org/10.1093/mnras/stac2686 | - |
dc.subject | stars; individual; MAXI J1820 + 070 –gamma rays; general –stars; black holes –X-rays; binaries | - |
dc.title | Gamma-ray observations of MAXI J1820+070 during the 2018 outburst | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1093/mnras/stac2686 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Physics publications |
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