期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 497, 期 2, 页码 2455-2468出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa1990
关键词
galaxies: active; galaxies: high-redshift; gamma rays: galaxies
资金
- Alfred P. Sloan Foundation
- NSF [AST-1908689]
- KAKENHI [20H01901]
We present a search for high-energy gamma-ray emission from 566 Active Galactic Nuclei at redshift z > 0.2, from the 2WHSP catalogue of high-synchrotron peaked BL Lac objects with 8 yr of Fermi-LAT data. We focus on a redshift range where electromagnetic cascade emission induced by ultra-high-energy cosmic rays can be distinguished from leptonic emission based on the spectral properties of the sources. Our analysis leads to the detection of 160 sources above approximate to 5 sigma (TS >= 25) in the 1-300 GeV energy range. By discriminating significant sources based on their gamma-ray fluxes, variability properties, and photon index in the Fermi-LAT energy range, and modelling the expected hadronic signal in the TeV regime, we select a list of promising sources as potential candidate ultra-high-energy cosmic ray emitters for follow-up observations by Imaging Atmospheric Cherenkov Telescopes.
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