PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAI - Gamma Ray Indirect
TAIGA-Observatory: First 5 years of operation of the HiSCORE Air-Cerenkov Array
A. Porelli*  on behalf of the TAIGA Collaboration
Full text: pdf
Pre-published on: August 01, 2021
Published on: March 18, 2022
TAIGA-HiSCORE is a wide-aperture Air-Cherenkov array, and is a major component of the TAIGA-Observatory (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy), locatedin the Tunka valley, 50 km from Lake Baikal, Russia. A main science target of TAIGA is gammaray astronomy above ten’s of TeV, in particular the search for sources of few 100 TeV gamma rays(candidate “PeVatrons”), the possible sites of Galactic cosmic ray acceleration. The HiSCORE arraywill consist of 120 optical Cerenkov stations, deployed on an area of 1 km2. Its construction will befinished in 2021.This report presents the performance of HiSCORE during the first 5 years of operation, in variousconfigurations, from 28 to 89 stations. A key for high sensitivity to gamma point sources is precisiontiming of the whole array down to sub-nsec level, required to be stable for the observation period.We apply different methods to reach this goal. The pointing resolution of the array for extended air-showers is obtained as 0.1° for highest energies, and is experimentally verified, based on independentapproaches. We present results of a 5-year-search for gamma-like point sources with HiSCORE insatnd-alone opertation.
DOI: https://doi.org/10.22323/1.395.0877
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