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MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Stockholm Univ, Dept Phys, Stockholm, Sweden..ORCID iD: 0000-0003-4378-8785
Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA..
Weizmann Inst Sci, Benoziyo Ctr Astrophys, Rehovot, Israel..
Number of Authors: 3072020 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 635, article id A158Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
EDP SCIENCES S A , 2020. Vol. 635, article id A158
Keywords [en]
gamma rays: general, methods: observational, ISM: supernova remnants
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-273136DOI: 10.1051/0004-6361/201936899ISI: 000526206100001Scopus ID: 2-s2.0-85082878636OAI: oai:DiVA.org:kth-273136DiVA, id: diva2:1429367
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QC 20200511

Available from: 2020-05-11 Created: 2020-05-11 Last updated: 2020-05-11Bibliographically approved

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Axelsson, Magnus

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