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Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies

H. Abdalla 1 R. Adam 2 F. Aharonian 3 F. Ait Benkhali 3 E. O. Angüner 4 M. Arakawa C. Arcaro 1 C. Armand 5 H. Ashkar 6 M. Backes 1 V. Barbosa Martins 7 M. Barnard 1 Y. Becherini D. Berge 7 K. Bernlöhr 3 R. Blackwell M. Böttcher 1 C. Boisson 8 J. Bolmont 9 S. Bonnefoy J. Bregeon 10 M. Breuhaus F. Brun 6 P. Brun 6 M. Bryan M. Büchele T. Bulik T. Bylund S. Caroff 9 A. Carosi 5 S. Casanova M. Cerruti 9 T. Chand S. Chandra A. Chen S. Colafrancesco M. Curyło I. D. Davids C. Deil 3 J. Devin 11 P. Dewilt L. Dirson A. Djannati-Ataï 12 A. Dmytriiev 13 A. Donath V. Doroshenko 14 J. Dyks K. Egberts 15 G. Emery 9 J.-P. Ernenwein 4 S. Eschbach K. Feijen S. Fegan 2 A. Fiasson 5 G. Fontaine 2 S. Funk M. Füßling S. Gabici 16 Y. A. Gallant 10 F. Gaté 5 G. Giavitto L. Giunti 12 D. Glawion J. F. Glicenstein 6 D. Gottschall M.-H. Grondin 11 J. Hahn M. Haupt 7 G. Heinzelmann G. Henri G. Hermann J. A. Hinton 3 W. Hofmann 3 C. Hoischen T. L. Holch M. Holler 17 D. Horns D. Huber 17 H. Iwasaki M. Jamrozy D. Jankowsky F. Jankowsky A. Jardin-Blicq I. Jung-Richardt M. A. Kastendieck K. Katarzyński M. Katsuragawa U. Katz D. Khangulyan B. Khélifi 12 J. King S. Klepser W. Kluźniak Nu. Komin K. Kosack 6 D. Kostunin 7 M. Kreter G. Lamanna 5 A. Lemière 12 M. Lemoine-Goumard 11 J.-P. Lenain 9 E. Leser C. Levy 9 T. Lohse I. Lypova J. Mackey J. Majumdar D. Malyshev V. Marandon A. Marcowith 10 A. Mares 11 C. Mariaud 2 G. Martí-Devesa R. Marx G. Maurin 5 P. J. Meintjes A. M. W. Mitchell 3, 18 R. Moderski M. Mohamed 19 L. Mohrmann C. Moore E. Moulin 6 J. Muller 2 T. Murach S. Nakashima M. de Naurois 2 H. Ndiyavala F. Niederwanger J. Niemiec L. Oakes P. O’brien H. Odaka S. Ohm E. de Ona Wilhelmi 7 M. Ostrowski I. Oya M. Panter 20 R. D. Parsons C. Perennes 9 P.-O. Petrucci 21 B. Peyaud 6 Q. Piel 5 S. Pita 12 V. Poireau 5 A. Priyana Noel D. A. Prokhorov H. Prokoph G. Pühlhofer M. Punch 12 A. Quirrenbach S. Raab R. Rauth A. Reimer O. Reimer Q. Remy 10 M. Renaud 10 F. Rieger L. Rinchiuso 6 C. Romoli G. Rowell B. Rudak E. Ruiz-Velasco V. Sahakian S. Sailer S. Saito D. A. Sanchez 5 A. Santangelo 14 M. Sasaki R. Schlickeiser F. Schüssler 6 A. Schulz H. M. Schutte U. Schwanke S. Schwemmer M. Seglar-Arroyo 6 M. Senniappan A. S. Seyffert N. Shafi K. Shiningayamwe R. Simoni A. Sinha 12 H. Sol 13 A. Specovius M. Spir-Jacob 12 Ł. Stawarz R. Steenkamp C. Stegmann C. Steppa T. Takahashi 22 T. Tavernier 6 A. M. Taylor R. Terrier 16 D. Tiziani 23 M. Tluczykont C. Trichard 2 M. Tsirou 10 N. Tsuji R. Tuffs Y. Uchiyama D. J. van der Walt C. van Eldik C. van Rensburg B. van Soelen G. Vasileiadis 10 J. Veh C. Venter P. Vincent 9 J. Vink H. J. Völk T. Vuillaume 5 Z. Wadiasingh S. J. Wagner R. White A. Wierzcholska R. Yang 3 H. Yoneda M. Zacharias R. Zanin A. A. Zdziarski A. Zech 8 J. Zorn N. Żywucka G. M. Madejski K. Nalewajko K. K. Madsen J. Chiang M. Baloković D. Paneque A. K. Furniss M. Hayashida C. M. Urry M. Ajello F. A. Harrison B. Giebels 2 D. Stern K. Forster P. Giommi M. Perri 24 S. Puccetti A. Zoglauer G. Tagliaferri 25
Abstract : Here we report the results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS 2155−304 involving Swift, NuSTAR, Fermi-LAT, and H.E.S.S. The use of these instruments allows us to cover a broad energy range, which is important for disentangling the different radiative mechanisms. The source, observed from June 2013 to October 2013, was found in a low flux state with respect to previous observations but exhibited highly significant flux variability in the X-rays. The high-energy end of the synchrotron spectrum can be traced up to 40 keV without significant contamination by high-energy emission. A one-zone synchrotron self-Compton model was used to reproduce the broadband flux of the source for all the observations presented here but failed for previous observations made in April 2013. A lepto-hadronic solution was then explored to explain these earlier observational results.
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Submitted on : Tuesday, July 7, 2020 - 9:52:24 PM
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H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali, E. O. Angüner, et al.. Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies. Astronomy and Astrophysics - A&A, EDP Sciences, 2020, 639, pp.A42. ⟨10.1051/0004-6361/201936900⟩. ⟨cea-02892930⟩

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