Please use this identifier to cite or link to this item:
|Scopus||Web of Science®||Altmetric|
|Title:||HESS observations of the flaring gravitationally lensed galaxy PKS 1830-211|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2019; 486(3):3886-3891|
|Publisher:||Oxford University Press|
|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|
|Appears in Collections:||Physics publications|
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.