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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Abstract

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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Key words

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

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