Effect of the uncertainty in the hadronic interaction models on the estimation of the sensitivity of the Cherenkov Telescope Array

Abstract

Imaging Atmospheric Cherenkov Telescopes (IACTs) are ground-based indirect detectors for cosmic gamma rays with energies above tens of GeV. The major backgrounds for gamma-ray observations in IACTs are cosmic-ray charged particles. The capability to reject these backgrounds is the most important factor determining the gamma-ray sensitivity of IACT systems. Monte Carlo simulations are used to estimate the residual background rates and sensitivity of the systems during the design and construction phase. Uncertainties in the modeling of high-energy hadronic interactions of cosmic rays with nuclei in the air propagate into the estimates of residual background rates and subsequently into the estimated instrument sensitivity. We investigate the influence of the difference in the current hadronic interaction models on the estimated gamma-ray sensitivity of the Cherenkov Telescope Array using four interaction models (QGSJET-II-03, QGSJET-II-04, EPOS-LHC, and SIBYLL2.3c) implemented in the air shower simulation tool CORSIKA. Variations in background rates of up to a factor 2 with respect to QGSJET-II-03 are observed between the models, mainly due to differences in the ${\pi }^0$ production spectrum. These lead to ~30% differences in the estimated gamma-ray sensitivity in the 1 - 30 TeV region, assuming a 50-hour observation of a gamma-ray point-like source. The presented results also show that IACTs have a significant capability in the verification of hadronic interaction models.

arXiv comment23 pages, 10 figures, accepted for publication in JPhysG

References in corpus (34)

• EPOS LHC : test of collective hadronization with LHC data
• Monte Carlo treatment of hadronic interactions in enhanced Pomeron scheme: I. QGSJET-II model
• Observations of the Crab Nebula with H.E.S.S
• The energy spectrum of cosmic-ray electrons at TeV energies
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• QGSJET-II: towards reliable description of very high energy hadronic interactions
• Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
• Energy Spectra of Abundant Nuclei of Primary Cosmic Rays from the Data of ATIC-2 Experiment: Final Results
• Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite
• Monte Carlo design studies for the Cherenkov Telescope Array
• Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory
• Implementation of the Random Forest Method for the Imaging Atmospheric Cherenkov Telescope MAGIC
• Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station
• Energy Spectrum of Cosmic-ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station
• The hadronic interaction model Sibyll-2.3c and inclusive lepton fluxes
• Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout
• Study of muons from ultra-high energy cosmic ray air showers measured with the Telescope Array experiment
• First ground based measurement of atmospheric Cherenkov light from cosmic rays
• Measurement of Cosmic-ray Electrons at TeV Energies by VERITAS
• Improved $\gamma$/hadron separation for the detection of faint gamma-ray sources using boosted decision trees
• Monte Carlo Performance Studies for the Site Selection of the Cherenkov Telescope Array
• Test of Hadronic Interaction Models in the Forward Region with KASCADE Event Rates
• A High Resolution Method for Measuring Cosmic Ray Composition beyond 10 TeV
• Systematic uncertainties in air shower measurements from high-energy hadronic interaction models
• Cosmic-Ray Events as Background in Imaging Atmospheric Cherenkov Telescopes
• The Cosmic Ray Proton Spectrum determined with the Imaging Atmospheric Cherenkov-Technique
• ALTAI: Computational code for the simulations of TeV air showers as observed with the ground-based imaging atmospheric Cherenkov telescopes
• Systematic Differences due to High Energy Hadronic Interaction Models in Air Shower Simulations in the 100 GeV-100 TeV Range
• Measurement of the Iron Spectrum in Cosmic Rays by VERITAS
• Nature of the low-energy, γ-like background for the Cherenkov Telescope Array
• Natural limit on the gamma/hadron separation for a stand alone air Cherenkov telescope
• LHC updated hadronic interaction packages analyzed up to cosmic-ray energies
• Potential for measuring the longitudinal and lateral profile of muons in TeV air showers with IACTs

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• Observations of the Crab Nebula and Pulsar with the Large-Sized Telescope Prototype of the Cherenkov Telescope Array
• Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data
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