Gamma-ray counterparts of 2WHSP high-synchrotron-peaked BL Lac objects as possible signatures of ultra-high-energy cosmic ray emission

Michael W. Toomey, Foteini Oikonomou, Kohta Murase

Research output: Contribution to journalArticlepeer-review

Abstract

We present a search for high-energy y-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 ˜5er (TS >25) in the 1-300 GeV energy range. By discriminating significant sources based on their y-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.

Original languageEnglish (US)
Pages (from-to)2455-2468
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume497
Issue number2
DOIs
StatePublished - Sep 1 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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