PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAI - Gamma Ray Indirect
Simulation Studies of MACE Gamma Ray Telescope : Estimation of Integral Sensitivity, Angular Resolution and Energy Resolution
C. Borwankar*, M. Sharma, N. Bhatt and S. Bhattacharyya
Full text: pdf
Pre-published on: July 06, 2021
Published on: March 18, 2022
The MACE (Major Atmospheric Cherenkov Experiment) is an Imaging Atmospheric Cherenkov Telescope (IACT) located in Hanle, India. It has highest altitude of 4270 m among all the IACTs in the world. The high altitude of MACE along with its large reflector having diameter of 21 m is expected to yield wide energy coverage of $\sim$ 20 GeV to $\sim$ 20 TeV. We have carried out detailed Monte Carlo simulations of the MACE response to gamma and cosmic ray showers
in this energy range for various zenith angles between 0$^{\circ}$ to 60$^{\circ}$. We estimated the variation of integral flux sensitivity, angular resolution and energy resolution as a function of energy, at various zenith angles. We find that the energy threshold of the MACE remains steady between $\sim$ 30 GeV to $\sim$ 50 GeV over the zenith angle range of 0$^{\circ}$ to 40$^{\circ}$ with integral flux sensitivity of $\sim$ 2 \% Crab. The Angular resolution of the MACE improves from 0.21$^{\circ}$ near the energy threshold to 0.07$^{\circ}$ at energy of > 1 TeV for zenith angle range of 0$^{\circ}$ to 40$^{\circ}$. The expected energy resolution of the MACE in the zenith angle range of 0$^{\circ}$ to 40$^{\circ}$ varies from $\sim$ 40 \% near energy threshold
to $\sim$ 20 \% for energies above 1 TeV. The MACE will detect Crab like point source within few minutes at all zenith angles, with best detection time of $\sim$ 80 seconds occurring at zenith angle of 25$^{\circ}$.
DOI: https://doi.org/10.22323/1.395.0723
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