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Very high energy $\gamma$-ray emission from two blazars of unknown redshift and upper limits on their distance

H. Abdalla R. Adam 1 F. Aharonian F. Ait Benkhali E.O. Angüner 2 M. Arakawa C. Arcaro C. Armand 3 T. Armstrong H. Ashkar 4 M. Backes V. Baghmanyan V. Barbosa Martins A. Barnacka M. Barnard Y. Becherini D. Berge K. Bernlöhr M. Böttcher C. Boisson 5 J. Bolmont 6 S. Bonnefoy J. Bregeon 7 M. Breuhaus F. Brun 4 P. Brun 4 M. Bryan M. Büchele T. Bulik T. Bylund S. Caroff 6 A. Carosi 3 S. Casanova T. Chand S. Chandra A. Chen G. Cotter M. Curyło I.D. Davids J. Davies C. Deil J. Devin 8 P. Dewilt L. Dirson A. Djannati-Ataï 9 A. Dmytriiev 5 A. Donath V. Doroshenko J. Dyks K. Egberts F. Eichhorn G. Emery 6 J.-P. Ernenwein 2 K. Feijen S. Fegan 1 A. Fiasson 3 G. Fontaine 1 S. Funk M. Füßling S. Gabici 9 Y.A. Gallant 7 G. Giavitto L. Giunti 9, 4 D. Glawion J.F. Glicenstein 4 D. Gottschall M.-H. Grondin 8 J. Hahn M. Haupt G. Hermann J.A. Hinton W. Hofmann C. Hoischen T.L. Holch M. Holler M. Hörbe D. Horns D. Huber H. Iwasaki M. Jamrozy D. Jankowsky F. Jankowsky A. Jardin-Blicq V. Joshi I. Jung-Richardt M.A. Kastendieck K. Katarzynski M. Katsuragawa U. Katz D. Khangulyan B. Khélifi 9 S. Klepser W. Kluzniak Nu. Komin R. Konno K. Kosack 4 D. Kostunin M. Kreter G. Lamanna 3 A. Lemière 9 M. Lemoine-Goumard 8 J.-P. Lenain 6 E. Leser C. Levy 6 T. Lohse I. Lypova J. Mackey J. Majumdar D. Malyshev V. Marandon P. Marchegiani A. Marcowith 7 A. Mares 8 G. Martí-Devesa R. Marx G. Maurin 3 P.J. Meintjes R. Moderski M. Mohamed L. Mohrmann C. Moore P. Morris E. Moulin 4 J. Muller 1 T. Murach S. Nakashima K. Nakashima M. de Naurois 1 H. Ndiyavala F. Niederwanger J. Niemiec L. Oakes P. O'Brien H. Odaka S. Ohm E. de Ona Wilhelmi M. Ostrowski M. Panter R.D. Parsons B. Peyaud 4 Q. Piel 3 S. Pita 9 V. Poireau 3 A. Priyana Noel D.A. Prokhorov H. Prokoph G. Pühlhofer M. Punch 9 A. Quirrenbach S. Raab R. Rauth A. Reimer O. Reimer Q. Remy M. Renaud 7 F. Rieger L. Rinchiuso 4 C. Romoli G. Rowell B. Rudak E. Ruiz-Velasco V. Sahakian S. Sailer S. Saito D.A. Sanchez 3 A. Santangelo M. Sasaki M. Scalici F. Schüssler 4 H.M. Schutte U. Schwanke S. Schwemmer M. Seglar-Arroyo 4 M. Senniappan A.S. Seyffert N. Shafi K. Shiningayamwe R. Simoni A. Sinha 9 H. Sol 5 A. Specovius S. Spencer M. Spirjacob 9 Ł. Stawarz R. Steenkamp C. Stegmann C. Steppa T. Takahashi T. Tavernier 4 A.M. Taylor R. Terrier 9 D. Tiziani M. Tluczykont L. Tomankova C. Trichard 1 M. Tsirou 7 N. Tsuji R. Tuffs Y. Uchiyama D.J. van der Walt C. van Eldik C. van Rensburg B. van Soelen G. Vasileiadis 7 J. Veh C. Venter P. Vincent 6 J. Vink H.J. Völk T. Vuillaume 3 Z. Wadiasingh S.J. Wagner J. Watson F. Werner R. White A. Wierzcholska R. Yang H. Yoneda M. Zacharias R. Zanin D. Zargaryan A.A. Zdziarski A. Zech 5 S.J. Zhu J. Zorn N. Zywucka M. Cerruti
Abstract : We report on the detection of very high energy (VHE; E > 100 GeV) γ-ray emission from the BL Lac objects KUV 00311−1938 and PKS 1440−389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE γ-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311−1938 of |$z$| < 0.98 and of PKS 1440−389 of |$z$| < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311−1938 is constrained to 0.51 ≤ |$z$| < 0.98 and of PKS 1440−389 to 0.14 ⪅ |$z$| < 0.53.
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H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E.O. Angüner, et al.. Very high energy $\gamma$-ray emission from two blazars of unknown redshift and upper limits on their distance. Mon.Not.Roy.Astron.Soc., 2020, 494 (4), pp.5590-5602. ⟨10.1093/mnras/staa999⟩. ⟨hal-03178771⟩

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