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Type: Journal article
Title: HESS observations of the flaring gravitationally lensed galaxy PKS 1830-211
Author: Abdalla, H.
Aharonian, F.
Benkhali, F.A.
Anguner, E.O.
Arakawa, M.
Arcaro, C.
Armand, C.
Arrieta, M.
Backes, M.
Barnard, M.
Becherini, Y.
Tjus, J.B.
Berge, D.
Bernloehr, K.
Blackwell, R.
Bottcher, M.
Boisson, C.
Bolmont, J.
Bonnefoy, S.
Bordas, P.
et al.
Citation: Monthly Notices of the Royal Astronomical Society, 2019; 486(3):3886-3891
Publisher: Oxford University Press
Issue Date: 2019
ISSN: 1365-2966
Statement of
H Abdalla, F Aharonian, F Ait Benkhali, E O Angüner ... Gavin P Rowell ... Fabien Voisin ... et al. (H E S S Collaboration)
Abstract: PKS 1830–211 is a known macrolensed quasar located at a redshift of z = 2.5. Its high-energy gamma-ray emission has been detected with the Fermi-Large Area Telescope (LAT) instrument and evidence for lensing was obtained by several authors from its high-energy data. Observations of PKS 1830–211 were taken with the High Energy Stereoscopic System (H.E.S.S.) array of Imaging Atmospheric Cherenkov Telescopes in 2014 August, following a flare alert by the Fermi-LAT Collaboration. The H.E.S.S observations were aimed at detecting a gamma-ray flare delayed by 20–27 d from the alert flare, as expected from observations at other wavelengths. More than 12 h of good-quality data were taken with an analysis threshold of ∼67 GeV. The significance of a potential signal is computed as a function of the date and the average significance over the whole period. Data are compared to simultaneous observations by Fermi-LAT. No photon excess or significant signal is detected. An upper limit on PKS 1830–211 flux above 67 GeV is computed and compared to the extrapolation of the Fermi-LAT flare spectrum.
Keywords: Gravitational lensing: strong; diffuse radiation; gamma-rays: galaxies
Rights: 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI: 10.1093/mnras/stz1031
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