2026-06-27T10:55:27Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/62322024-09-06T15:29:36Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Barrio Uña, Juan Abel author Contreras González, José Luis author Fidalgo, David Friedrich Carreto author Fonseca González, María Victoria author Hoang, Kim Dinh author López Moya, Marcos author Peñil Del Campo, Pablo author Saha, Lab author 2020-03-30 Aims. We measure the Crab Nebula gamma-ray spectral energy distribution in the 100 TeV energy domain and test the validity of existing leptonic emission models at these high energies.Methods. We used the novel very large zenith angle observations with the MAGIC telescope system to increase the collection area above 10 TeV. We also developed an auxiliary procedure of monitoring atmospheric transmission in order to assure proper calibration of the accumulated data. This employs recording optical images of the stellar field next to the source position, which provides a better than 10% accuracy for the transmission measurements.Results. We demonstrate that MAGIC very large zenith angle observations yield a collection area larger than a square kilometer. In only 56 h of observations, we detect the gamma-ray emission from the Crab Nebula up to 100 TeV, thus providing the highest energy measurement of this source to date with Imaging Atmospheric Cherenkov Telescopes. Comparing accumulated and archival MAGIC and Fermi/LAT data with some of the existing emission models, we find that none of them provides an accurate description of the 1 GeV to 100 TeV gamma-ray signal. 0004-6361 10.1051/0004-6361/201936899 https://hdl.handle.net/20.500.14352/6232 https://doi.org/10.1051/0004-6361/201936899 https://www.aanda.org/ MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV