A1 Refereed original research article in a scientific journal
MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV
Authors: Acciari V.A., Ansoldi S., Antonelli L.A., Arbet Engels A., Baack D., Babić A., Banerjee B., Barres De Almeida U., Barrio J.A., Becerra González J., Bednarek W., Bellizzi L., Bernardini E., Berti A., Besenrieder J., Bhattacharyya W., Bigongiari C., Biland A., Blanch O., Bonnoli G., Bošnjak Z., Busetto G., Carosi R., Ceribella G., Chai Y., Chilingaryan A., Cikota S., Colak S.M., Colin U., Colombo E., Contreras J.L., Cortina J., Covino S., D'Elia V., Da Vela P., Dazzi F., De Angelis A., De Lotto B., Delfino M., Delgado J., Depaoli D., Di Pierro F., Di Venere L., Do Souto Espiñeira E., Dominis Prester D., Donini A., Dorner D., Doro M., Elsaesser D., Fallah Ramazani V., Fattorini A., Ferrara G., Fidalgo D., Foffano L., Fonseca M.V., Font L., Fruck C., Fukami S., García López R.J., Garczarczyk M., Gasparyan S., Gaug M., Giglietto N., Giordano F., Godinović N., Green D., Guberman D., Hadasch D., Hahn A., Herrera J., Hoang J., Hrupec D., Hütten M., Inada T., Inoue S., Ishio K., Iwamura Y., Jouvin L., Kerszberg D., Kubo H., Kushida J., Lamastra A., Lelas D., Leone F., Lindfors E., Lombardi S., Longo F., López M., López-Coto R., López-Oramas A., Loporchio S., Machado De Oliveira Fraga B., Maggio C., Majumdar P., Makariev M., Mallamaci M., Maneva G., Manganaro M., Mannheim K., Maraschi L., Mariotti M., Martínez M., Mazin D., Mićanović S., Miceli D., Minev M., Miranda J.M., Mirzoyan R., Molina E., Moralejo A., Morcuende D., Moreno V., Moretti E., Munar-Adrover P., Neustroev V., Nigro C., Nilsson K., Ninci D., Nishijima K., Noda K., Nogués L., Nozaki S., Paiano S., Palacio J., Palatiello M., Paneque D., Paoletti R., Paredes J.M., Peñil P., Peresano M., Persic M., Prada Moroni P.G., Prandini E., Puljak I., Rhode W., Ribó M., Rico J., Righi C., Rugliancich A., Saha L., Sahakyan N., Saito T., Sakurai S., Satalecka K., Schmidt K., Schweizer T., Sitarek J., Šnidarić I., Sobczynska D., Somero A., Stamerra A., Strom D., Strzys M., Suda Y., Surić T., Takahashi M., Tavecchio F., Temnikov P., Terzić T., Teshima M., Torres-Albà N., Tosti L., Vagelli V., Van Scherpenberg J., Vanzo G., Vazquez Acosta M., Vigorito C.F., Vitale V., Vovk I., Will M., Zarić D.
Publisher: EDP SCIENCES S A
Publication year: 2020
Journal: Astronomy and Astrophysics
Journal name in source: ASTRONOMY & ASTROPHYSICS
Journal acronym: ASTRON ASTROPHYS
Article number: ARTN A158
Volume: 635
Number of pages: 10
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/201936899
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/47359776
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.
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