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Title: MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV
Author: Molina, Edgar
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Torres Albà, Núria
MAGIC Collaboration
Keywords: Raigs gamma
Gamma rays
Issue Date: Mar-2020
Publisher: EDP Sciences
Abstract: Aims. WemeasuretheCrabNebulaγ-rayspectralenergydistributioninthe∼100TeVenergydomainandtestthevalidityofexisting 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 γ-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 γ-ray signal.
Note: Reproducció del document publicat a:
It is part of: Astronomy & Astrophysics, 2020, vol. 635, p. A158
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ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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