TY - JOUR
T1 - Gamma-ray counterparts of 2WHSP high-synchrotron-peaked BL Lac objects as possible signatures of ultra-high-energy cosmic ray emission
AU - Toomey, Michael W.
AU - Oikonomou, Foteini
AU - Murase, Kohta
N1 - Funding Information:
This work was initiated in 2016 for the honors thesis ‘BLAZARS AS A SOURCE FOR ULTRA-HIGH-ENERGY COSMIC RAYS? A SEARCH FOR THE ELUSIVE HADRONIC SIGNATURE’ at the Schreyer Honors College of Penn State University in 2018. We thank Gordana Tesˇić for fruitful input during the early stages of this work. We also thank Akira Okumura for useful comments on sensitivity curves. The work of KM is supported by the Alfred P. Sloan Foundation, NSF Grant No. AST-1908689, and KAKENHI No. 20H01901.
Funding Information:
This work was initiated in 2016 for the honors thesis 'BLAZARS AS A SOURCE FOR ULTRA-HIGH-ENERGY COSMIC RAYS? A SEARCH FOR THE ELUSIVE HADRONIC SIGNATURE' at the Schreyer Honors College of Penn State University in 2018. We thank Gordana Te?ic for fruitful input during the early stages of this work. We also thank Akira Okumura for useful comments on sensitivity curves. The work of KM is supported by the Alfred P. Sloan Foundation, NSF Grant No. AST-1908689, and KAKENHI No. 20H01901.
Publisher Copyright:
© 2020 The Author(s).
PY - 2020/9/1
Y1 - 2020/9/1
N2 - 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.
AB - 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.
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U2 - 10.1093/mnras/staa1990
DO - 10.1093/mnras/staa1990
M3 - Article
AN - SCOPUS:85095429572
VL - 497
SP - 2455
EP - 2468
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -