Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance
Author:
Abdalla H1, Adam R2, Aharonian F345, Ait Benkhali F3, Angüner E O6, Arakawa M7, Arcaro C1, Armand C8, Armstrong T9, Ashkar H10, Backes M111, Baghmanyan V12, Barbosa Martins V13, Barnacka A14, Barnard M1, Becherini Y15ORCID, Berge D13, Bernlöhr K3, Böttcher M1, Boisson C16, Bolmont J17, Bonnefoy S13, Bregeon J18, Breuhaus M3, Brun F10, Brun P10, Bryan M19, Büchele M20, Bulik T21, Bylund T15, Caroff S17, Carosi A8, Casanova S312, Chand T1, Chandra S1, Chen A22, Cotter G9, Curyło M21, Davids I D11, Davies J9, Deil C3, Devin J23, deWilt P24, Dirson L25, Djannati-Ataï A26, Dmytriiev A16, Donath A3, Doroshenko V27, Dyks J28, Egberts K29, Eichhorn F20, Emery G17, Ernenwein J -P6, Feijen K24, Fegan S2, Fiasson A8, Fontaine G2, Funk S20, Füßling M13, Gabici S26, Gallant Y A18, Giavitto G13, Giunti L1026, Glawion D30, Glicenstein J F10, Gottschall D27, Grondin M -H23, Hahn J3, Haupt M13, Hermann G3, Hinton J A3, Hofmann W3, Hoischen C29, Holch T L31, Holler M32, Hörbe M9, Horns D25, Huber D32, Iwasaki H7, Jamrozy M14, Jankowsky D20, Jankowsky F30, Jardin-Blicq A3, Joshi V20, Jung-Richardt I20, Kastendieck M A25, Katarzyński K33, Katsuragawa M34, Katz U20, Khangulyan D7, Khélifi B26, Klepser S13, Kluźniak W28, Komin Nu22, Konno R13, Kosack K10, Kostunin D13, Kreter M1, Lamanna G8, Lemière A26, Lemoine-Goumard M23, Lenain J -P17, Leser E1329, Levy C17, Lohse T31, Lypova I13, Mackey J4, Majumdar J13, Malyshev D2, Malyshev D20, Marandon V3, Marchegiani P22, Marcowith A18, Mares A23, Martí-Devesa G32, Marx R330, Maurin G8, Meintjes P J35, Moderski R28, Mohamed M30, Mohrmann L20, Moore C36, Morris P9, Moulin E10, Muller J27, Murach T13, Nakashima S37, Nakashima K20, de Naurois M27, Ndiyavala H1, Niederwanger F32, Niemiec J12, Oakes L31, O’Brien P36, Odaka H38, Ohm S13, de Oña Wilhelmi E13, Ostrowski M14, Panter M3, Parsons R D3, Peyaud B10, Piel Q8, Pita S26, Poireau V8, Noel A P14, Prokhorov D A1922, Prokoph H13, Pühlhofer G2, Punch M1526, Quirrenbach A30, Raab S20, Rauth R32, Reimer A32, Reimer O32, Remy Q3, Renaud M18, Rieger F3, Rinchiuso L10, Romoli C3, Rowell G24, Rudak B28, Ruiz-Velasco E3, Sahakian V39, Sailer S3, Saito S7, Sanchez D A8, Santangelo A2, Sasaki M20, Scalici M2, Schüssler F10, Schutte H M1, Schwanke U31, Schwemmer S30, Seglar-Arroyo M10, Senniappan M15, Seyffert A S1, Shafi N22, Shiningayamwe K11, Simoni R19, Sinha A26, Sol H16, Specovius A20, Spencer S9, Spir-Jacob M26, Stawarz Ł14, Steenkamp R11, Stegmann C1329, Steppa C29, Takahashi T34, Tavernier T10, Taylor A M13, Terrier R26, Tiziani D20, Tluczykont M25, Tomankova L20, Trichard C27, Tsirou M18, Tsuji N7, Tuffs R3, Uchiyama Y7, van der Walt D J1, van Eldik C20, van Rensburg C1, van Soelen B35, Vasileiadis G18, Veh J20, Venter C1, Vincent P17, Vink J19, Völk H J3, Vuillaume T8, Wadiasingh Z1, Wagner S J30, Watson J9, Werner F3, White R3, Wierzcholska A1230, Yang R3, Yoneda H34, Zacharias M140, Zanin R3, Zargaryan D4, Zdziarski A A28, Zech A16, Zhu S J13, Zorn J3, Żywucka N1, Cerruti M41ORCID
Affiliation:
1. Centre for Space Research, North-West University, Potchefstroom 2520, South Africa 2. Laboratoire Leprince-Ringuet, École Polytechnique, CNRS, Institut Polytechnique de Paris, F-91128 Palaiseau, France 3. Max-Planck-Institut für Kernphysik, PO Box 103980, D-69029 Heidelberg, Germany 4. Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland 5. High Energy Astrophysics Laboratory, RAU, 123 Hovsep Emin St, Yerevan 0051, Armenia 6. Aix Marseille Université, CNRS/IN2P3, CPPM, F-13288 Marseille, France 7. Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan 8. Laboratoire d’Annecy de Physique des Particules, Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LAPP, F-74000 Annecy, France 9. University of Oxford, Department of Physics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK 10. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France 11. Department of Physics, University of Namibia,Private Bag 13301, Windhoek 12010, Namibia 12. Instytut Fizyki Ja̧drowej PAN, ul. Radzikowskiego 152, PL-31-342 Kraków, Poland 13. DESY, D-15738 Zeuthen, Germany 14. Obserwatorium Astronomiczne, Uniwersytet Jagielloński, ul. Orla 171, PL-30-244 Kraków, Poland 15. Department of Physics and Electrical Engineering, Linnaeus University, SE-351 95 Växjö, Sweden 16. LUTH, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, 5 Place Jules Janssen, F-92190 Meudon, France 17. Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, F-75252 Paris, France 18. Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, CC 72, Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France 19. GRAPPA, Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, NL-1098 XH Amsterdam, the Netherlands 20. Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str 1, D-91058 Erlangen, Germany 21. Astronomical Observatory, The University of Warsaw, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland 22. School of Physics, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein, Johannesburg 2050 South Africa 23. Université Bordeaux, CNRS/IN2P3, Centre d’Études Nucléaires de Bordeaux Gradignan, F-33175 Gradignan, France 24. School of Physical Sciences, University of Adelaide, Adelaide 5005, Australia 25. Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany 26. Université de Paris, CNRS, Astroparticule et Cosmologie, F-75013 Paris, France 27. Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D-72076 Tübingen, Germany 28. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, PL-00-716 Warsaw, Poland 29. Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, D-14476 Potsdam, Germany 30. Landessternwarte, Universität Heidelberg, Königstuhl, D-69117 Heidelberg, Germany 31. Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany 32. Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria 33. Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, PL-87-100 Torun, Poland 34. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8583, Japan 35. Department of Physics, University of the Free State, PO Box 339, Bloemfontein 9300, South Africa 36. Department of Physics and Astronomy, The University of Leicester, University Road, Leicester LE1 7RH, UK 37. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan 38. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 39. Yerevan Physics Institute, 2 Alikhanian Brothers St, 375036 Yerevan, Armenia 40. Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany 41. Institut de Ciències del Cosmos (ICC UB), Universitat de Barcelona (IEEC-UB), Martí Franquès 1, E-08028 Barcelona, Spain
Abstract
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.
Funder
Max Planck Society DFG Helmholtz Association Alexander von Humboldt Foundation Centre National de la Recherche Scientifique Commissariat à l'Énergie Atomique et aux Énergies Alternatives CEA Science and Technology Facilities Council Knut and Alice Wallenberg Foundation National Science Centre, Poland University of Namibia NCRST FWF Australian Research Council Japan Society for the Promotion of Science University of Amsterdam “la Caixa” Foundation
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
20 articles.
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