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HESS observations of the flaring gravitationally lensed galaxy PKS 1830-211
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Number of Authors: 2252019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 486, no 3, p. 3886-3891Article in journal (Refereed) Published
Abstract [en]

PKS 1830-211 is a known macrolensed quasar located at a redshift of z = 2.5. Its highenergy 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 similar to 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.

Place, publisher, year, edition, pages
2019. Vol. 486, no 3, p. 3886-3891
Keywords [en]
gravitational lensing: strong, diffuse radiation, gamma-rays: galaxies
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-172020DOI: 10.1093/mnras/stz1031ISI: 000474903500069OAI: oai:DiVA.org:su-172020DiVA, id: diva2:1350920
Available from: 2019-09-12 Created: 2019-09-12 Last updated: 2019-09-12Bibliographically approved

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Backes, M.Barnard, M.Sasaki, M.Venter, C.Wagner, Robert M.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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