Gamma-ray observations of MAXI J1820+070 during the 2018 outburst (CROSBI ID 317289)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Abe, H ; (...) ; Babić, Ana ; (...) ; Bošnjak, Željka ; (...) ; Cikota, Stefan ; (...) ; Dominis Prester, Dijana ; (...) ; Godinović, Nikola ; (...) ; Hrupec, Dario ; (...) ; Lelas, Damir ; (...) ; Manganaro, Marina ; (...) ; Mićanović, Saša ; (...) ; Pavletić, Lovro ; (...) ; Puljak, Ivica ; (...) ; Strišković, Jelena ; (...) ; Surić, Tihomir ; (...) ; Terzić, Tomislav ; (...) ; Zarić, Darko ; (...) ; Sala, G.
MAGIC Collaboration ; H.E.S.S. Collaboration ; VERITAS Collaboration
engleski
Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
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.
stars: individual: MAXI J1820+070 ; gamma rays: general ; stars: black holes ; X-rays: binaries
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o izdanju
517 (4)
2022.
4736-4751
objavljeno
0035-8711
1365-2966
10.1093/mnras/stac2686
