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arxiv: 1904.05139 · v1 · submitted 2019-04-10 · 🌌 astro-ph.HE

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H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830-211

H.E.S.S. Collaboration: H. Abdalla (1) , F. Aharonian (3 , 4 , 5) , F. Ait Benkhali (3) , E.O. Anguener (19) , M. Arakawa (39) , C. Arcaro (1)
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C. Armand (23) M. Arrieta (14) M. Backes (8 1) M. Barnard (1) Y. Becherini (10) J. Becker Tjus (11) D. Berge (35) K. Bernloehr (3) R. Blackwell (13) M. Boettcher (1) C. Boisson (14) J. Bolmont (15) S. Bonnefoy (35) P. Bordas (3) J. Bregeon (16) F. Brun (17) P. Brun (17) M. Bryan (9) M. Buchele (34) T. Bulik (18) T. Bylund (10) M. Capasso (27) S. Caroff (28) A. Carosi (23) S. Casanova (20 3) M. Cerruti (15 44) N. Chakraborty (3) T. Chand (1) S. Chandra (1) R.C.G. Chaves (16 21) A. Chen (22) S. Colafrancesco (22) B. Condon (25) I.D. Davids (8) C. Deil (3) J. Devin (16) P. deWilt (13) L. Dirson (2) A. Djannati-Atai (29) A. Dmytriiev (14) A. Donath (3) V. Doroshenko (27) L.O'C. Drury (4) J. Dyks (32) K. Egberts (33) G. Emery (15) J.-P. Ernenwein (19) S. Eschbach (34) S. Fegan (28) A. Fiasson (23) G. Fontaine (28) S. Funk (34) M. Fuessling (35) S. Gabici (29) Y.A. Gallant (16) F. Gat\'e (23) G. Giavitto (35) D. Glawion (24) J.F. Glicenstein (17) D. Gottschall (27) M.-H. Grondin (25) J. 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Zywucka (36) ((1) Centre for Space Research North-West University (2) Universitaet Hamburg Institut fuer Experimentalphysik (3) Max-Planck-Institut fuer Kernphysik (4) Dublin Institute for Advanced Studies (5) National Academy of Sciences of the Republic of Armenia (6) Yerevan Physics Institute (7) Institut fuer Physik Humboldt-Universitaet zu Berlin (8) University of Namibia Department of Physics (9) GRAPPA Anton Pannekoek Institute for Astronomy University of Amsterdam (10) Department of Physics Electrical Engineering Linnaeus University (11) Institut fuer Theoretische Physik Lehrstuhl IV: Weltraum und Astrophysik Ruhr-Universitaet Bochum (12) Institut fuer Astro- und Teilchenphysik Leopold-Franzens-Universitaet Innsbruck (13) School of Physical Sciences University of Adelaide (14) LUTH Observatoire de Paris (15) Laboratoire de Physique Nucl\'eaire et de Hautes Energies (16) Laboratoire Univers et Particules de Montpellier (17) IRFU CEA Universit\'e Paris-Saclay (18) Astronomical Observatory The University of Warsaw (19) Centre de Physique des Particules de Marseille (20) Instytut Fizyki Jadrowej PAN (21) Funded by EU FP7 Marie Curie (22) School of Physics University of the Witwatersrand (23) Laboratoire d'Annecy de Physique des Particules (24) Landessternwarte Universitaet Heidelberg (25) Centre d'Etudes Nucl\'eaires de Bordeaux Gradignan (26) Oskar Klein Centre (27) Institut fuer Astronomie und Astrophysik Universitaet Tuebingen (28) Laboratoire Leprince-Ringuet Ecole polytechnique (29) APC Astroparticule et Cosmologie (30) Institut de Plan\'etologie et d'Astrophysique de Grenoble (31) Department of Physics Astronomy The University of Leicester (32) Nicolaus Copernicus Astronomical Center Warsaw (33) Institut fuer Physik und Astronomie Universitaet Potsdam (34) Erlangen Centre for Astroparticle Physics (35) DESY Zeuthen (36) Obserwatorium Astronomiczne Uniwersytet Jagiellonski (37) Centre for Astronomy Faculty of Physics Informatics Nicolaus Copernicus University Torun (38) Department of Physics University of the Free State (39) Department of Physics Rikkyo University (40) Kavli Institute for the Physics Mathematics of the Universe (Kavli IPMU) The University of Tokyo Institutes for Advanced Study (UTIAS) (41) Department of Physics The University of Tokyo (42) RIKEN (43) Now at Physik Institut Universitaet Zurich (44) Now at Institut de Ciencies del Cosmos (ICC UB) Universitat de Barcelona (IEEC-UB))
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classification 🌌 astro-ph.HE
keywords observationsflaredatafermi-latwerealertcomparedcomputed
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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-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 H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes in August 2014, 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 days from the alert flare, as expected from observations at other wavelengths. More than twelve hours of good quality data were taken with an analysis threshold of $\sim67$ GeV. The significance of a potential signal is computed as a function of the date as well as 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.

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