Speaker
Description
Andes Large area PArticle detector for Cosmic ray physics and Astronomy (ALPACA) is an air shower array experiment aiming to observe cosmic rays and gamma-rays in the southern hemisphere. The array will cover an 83,000
In the southern sky, the Galactic Center is a possible candidate for PeV particle accelerators, PeVatrons. Observations of sub-PeV gamma rays are essential to test the existence of PeVatrons, but so far, the energy spectrum is measured up to a few tens of TeV. The half density ALPACA is designed to have a sufficient sensitivity to test the gamma-ray emission from the Galactic Center in this energy range.
In this contribution, the performance of the half density ALPACA to a hypothetical gamma-ray source with the same trajectory and energy spectrum as the Galactic Center is reported. In addition to the effective area, the angular and energy resolutions in the gamma-ray observations and the differential flux sensitivity after the cosmic-ray background rejection are presented. If the spectrum is extended up to the 100 TeV region from the TeV measurements keeping the power-law function, more than 5 sigma detection at 100 TeV is expected during two-year observation.
