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

H Abdalla,F Aharonian,F Ait Benkhali, E O Angüner, M Arakawa, C Arcaro, C Armand, M Arrieta,M Backes,M Barnard,Y Becherini,J Becker Tjus,D Berge,K Bernlöhr,R Blackwell,M Böttcher,C Boisson,J Bolmont,S Bonnefoy,P Bordas, J Bregeon,F Brun,P Brun,M Bryan, M Büchele,T Bulik, T Bylund,M Capasso,S Caroff,A Carosi,S Casanova,M Cerruti,N Chakraborty,T Chand,S Chandra,R C G Chaves,A Chen,S Colafrancesco,B Condon,I D Davids, C Deil,J Devin, P deWilt, L Dirson, A Djannati-Ataï, A Dmytriiev,A Donath,V Doroshenko,L O’C Drury,J Dyks,K Egberts, G Emery,J-P Ernenwein, S Eschbach,S Fegan, A Fiasson,G Fontaine,S Funk, M Füßling, S Gabici, Y A Gallant, F Gaté, G Giavitto, D Glawion, J F Glicenstein, D Gottschall,M-H Grondin,J Hahn,M Haupt, G Heinzelmann, G Henri,G Hermann,J A Hinton,W Hofmann,C Hoischen,T L Holch,M Holler,D Horns,D Huber,H Iwasaki, A Jacholkowska,M Jamrozy, D Jankowsky, F Jankowsky, L Jouvin, I Jung-Richardt, M A Kastendieck, K Katarzyński,M Katsuragawa,U Katz,D Khangulyan,B Khélifi,J King, S Klepser,W Kluźniak,Nu Komin,K Kosack,M Kraus,G Lamanna,J Lau, J Lefaucheur,A Lemière, M Lemoine-Goumard,J-P Lenain, E Leser, T Lohse,R López-Coto, M Lorentz, I Lypova,D Malyshev,V Marandon,A Marcowith, C Mariaud,G Martí-Devesa, R Marx,G Maurin, P J Meintjes, A M W Mitchell,R Moderski,M Mohamed,L Mohrmann,C Moore,E Moulin, T Murach,S Nakashima,M de Naurois,H Ndiyavala, F Niederwanger,J Niemiec, L Oakes,P O’Brien,H Odaka,S Ohm,M Ostrowski,I Oya, M Panter,R D Parsons, C Perennes,P-O Petrucci,B Peyaud, Q Piel,S Pita,V Poireau,A Priyana Noel, D A Prokhorov, H Prokoph, G Pühlhofer,M Punch,A Quirrenbach, S Raab, R Rauth, A Reimer,O Reimer,M Renaud,F Rieger, L Rinchiuso,C Romoli, G Rowell,B Rudak, E Ruiz-Velasco,V Sahakian,S Saito,D A Sanchez,A Santangelo,M Sasaki, R Schlickeiser,F Schüssler, A Schulz, H Schutte, U Schwanke, S Schwemmer,M Seglar-Arroyo, M Senniappan, A S Seyffert, N Shafi, I Shilon, K Shiningayamwe,R Simoni,A Sinha,H Sol, A Specovius, M Spir-Jacob, Ł Stawarz, R Steenkamp,C Stegmann, C Steppa,T Takahashi,J-P Tavernet,T Tavernier,A M Taylor,R Terrier, D Tiziani, M Tluczykont, C Trichard, M Tsirou,N Tsuji, R Tuffs,Y Uchiyama,D J van der Walt,C van Eldik,C van Rensburg,B van Soelen,G Vasileiadis, J Veh,C Venter,P Vincent,J Vink,F Voisin, H J Völk, T Vuillaume,Z Wadiasingh,S J Wagner,R M Wagner,R White,A Wierzcholska,R Yang, H Yoneda,D Zaborov,M Zacharias, R Zanin,A A Zdziarski, A Zech,A Ziegler,J Zorn,N Żywucka

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY（2019）

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摘要

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.

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gravitational lensing: strong,diffuse radiation,gamma-rays: galaxies

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