2026-07-31T05:47:22Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/82582024-09-05T16:52:58Zcom_20.500.14352_14col_20.500.14352_15

Baquero Larriva, Orlando Andrés Barrio Uña, Juan Abel Contreras González, José Luis Fonseca González, María Victoria Hoang, Kim Dinh López Moya, Marcos Miener, Tjark Morcuende, D. Peñil Del Campo, Pablo Saha, Lab 2023-06-17T09:08:26Z 2023-06-17T09:08:26Z 2020-11-20 0004-6361 10.1051/0004-6361/202039131 https://hdl.handle.net/20.500.14352/8258 https://doi.org/10.1051/0004-6361/202039131 https://www.aanda.org/ We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between 15 GeV and 75 GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, similar to 80 h of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, 11 years of Fermi-LAT data above 100 MeV were also analysed. From the two pulses per rotation seen by Fermi-LAT, only the second one, P2, is detected in the MAGIC energy range, with a significance of 6.3 sigma. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index Gamma =5.62 +/- 0.54, which smoothly extends the Fermi-LAT spectrum. A joint fit to MAGIC and Fermi-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the 3.6 sigma significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap. eng open access Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV journal article