期刊
ASTROPARTICLE PHYSICS
卷 72, 期 -, 页码 76-94出版社
ELSEVIER
DOI: 10.1016/j.astropartphys.2015.02.005
关键词
Gamma-ray astronomy; Cherenkov telescopes; Crab Nebula
资金
- German BMBF
- German MPG
- Italian INFN
- Swiss National Fund SNF
- Spanish MINECO [FPA2012-39502, JCI-2011-10019]
- CPAN [CSD2007-00042]
- Spanish Consolider-Ingenio programme [CSD2009-00064]
- Academy of Finland [127740]
- DFG Cluster of Excellence Origin and Structure of the Universe
- Croatian Science Foundation (HrZZ) Project [09/176]
- DFG Collaborative Research Centers [SFB823/C4, SFB876/C3]
- Polish MNiSzW grant [745/N-HESS-MAGIC/2010/0]
- ERDF
- ICREA Funding Source: Custom
MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary island of La Palma, Spain. During summer 2011 and 2012 it underwent a series of upgrades, involving the exchange of the MAGIC-I camera and its trigger system, as well as the upgrade of the readout system of both telescopes. We use observations of the Crab Nebula taken at low and medium zenith angles to assess the key performance parameters of the MAGIC stereo system. For low zenith angle observations, the standard trigger threshold of the MAGIC telescopes is similar to 50 GeV. The integral sensitivity for point-like sources with Crab Nebula-like spectrum above 220 GeV is (0.66 +/- 0.03)% of Crab Nebula flux in 50 h of observations. The angular resolution, defined as the a of a 2-dimensional Gaussian distribution, at those energies is less than or similar to 0.07 degrees, while the energy resolution is 16%. We also re-evaluate the effect of the systematic uncertainty on the data taken with the MAGIC telescopes after the upgrade. We estimate that the systematic uncertainties can be divided in the following components: < 15% in energy scale, 11%-18% in flux normalization and +/- 0.15 for the energy spectrum power-law slope. (C) 2015 Elsevier B.V. All rights reserved.
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