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The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT

H. Abdalla A. Abramowski F. Aharonian F. Ait Benkhali A. Akhperjanian T. Andersson E. Angüner M. Arrieta 1 P. Aubert 2 M. Backes Agnès Balzer M. Barnard Y. Becherini J. Becker Tjus D. Berge S. Bernhard K. Bernlöhr R. Blackwell M. Böttcher C. Boisson 1 J. Bolmont 3 P. Bordas J. Bregeon 4 F. Brun 5 P. Brun 6 M. Bryan T. Bulik M. Capasso J. Carr 7 S. Casanova M. Cerruti 3 N. Chakraborty R. Chalme-Calvet 3 R.C. Chaves 4 A. Chen J. Chevalier 2 M. Chrétien 3 S. Colafrancesco G. Cologna B. Condon 5 J. Conrad Y. Cui I. Davids J. Decock 6 B. Degrange 8 C. Deil J. Devin 4 P. Dewilt L. Dirson A. Djannati-Ataï 9 W. Domainko A. Donath L. O’c. Drury G. Dubus 10 K. Dutson J. Dyks T. Edwards K. Egberts P. Eger J.-P. Ernenwein 7 S. Eschbach C. Farnier S. Fegan 8 M. Fernandes A. Fiasson 2 G. Fontaine 8 A. Förster S. Funk M. Füßling S. Gabici 9 M. Gajdus Y. Gallant 4 T. Garrigoux G. Giavitto B. Giebels 8 J. Glicenstein 6 D. Gottschall A. Goyal M.-H. Grondin 5 D. Hadasch J. Hahn M. Haupt J. Hawkes G. Heinzelmann G. Henri 10 G. Hermann O. Hervet 1 J. Hinton W. Hofmann C. Hoischen M. Holler 8 D. Horns A. Ivascenko A. Jacholkowska 3 M. Jamrozy M. Janiak D. Jankowsky F. Jankowsky M. Jingo T. Jogler L. Jouvin 9 I. Jung-Richardt M. Kastendieck K. Katarzyński U. Katz D. Kerszberg 3 B. Khélifi 9 Michel Kieffer 3 J. King S. Klepser D. Klochkov W. Kluźniak D. Kolitzus Nu. Komin K. Kosack 6 S. Krakau M. Kraus F. Krayzel 2 P. Krüger H. Laffon 5 G. Lamanna 2 J. Lau J.-P. Lees 2 J. Lefaucheur 1 V. Lefranc 6 A. Lemière 9 M. Lemoine-Goumard 5 J.-P. Lenain 3 E. Leser T. Lohse M. Lorentz 6 R. Liu R. López-Coto I. Lypova V. Marandon A. Marcowith 4 C. Mariaud 8 R. Marx G. Maurin 2 N. Maxted M. Mayer P. Meintjes M. Meyer A. Mitchell R. Moderski M. Mohamed L. Mohrmann K. Morå Emmanuel Moulin 6 T. Murach M. de Naurois 8 F. Niederwanger J. Niemiec L. Oakes P. O’brien H. Odaka S. Öttl S. Ohm M. Ostrowski I. Oya M. Padovani 4 M. Panter R. Parsons N. Pekeur G. Pelletier 10 C. Perennes 3 P.-O. Petrucci 10 B. Peyaud 6 Q. Piel 2 S. Pita 9 H. Poon D. Prokhorov H. Prokoph G. Pühlhofer M. Punch 9 A. Quirrenbach S. Raab A. Reimer O. Reimer M. Renaud 4 R. De Los Reyes F. Rieger C. Romoli S. Rosier-Lees 2 G. Rowell B. Rudak C. Rulten 1 V. Sahakian D. Salek D. Sanchez 2 A. Santangelo M. Sasaki R. Schlickeiser F. Schüssler 6 A. Schulz U. Schwanke S. Schwemmer M. Settimo 3 A. Seyffert N. Shafi I. Shilon R. Simoni H. Sol 1 F. Spanier G. Spengler F. Spies Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch J.-P. Tavernet 3 T. Tavernier 9 A. Taylor R. Terrier 9 L. Tibaldo D. Tiziani M. Tluczykont C. Trichard 7 R. Tuffs Y. Uchiyama D. van der Walt C. Van Eldik C. Van Rensburg B. Van Soelen G. Vasileiadis 4 J. Veh C. Venter A. Viana P. Vincent 3 J. Vink F. Voisin H. Völk T. Vuillaume 2 Z. Wadiasingh S. Wagner P. Wagner R.M. Wagner R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters 6 R. Yang V. Zabalza D. Zaborov 8 M. Zacharias A. Zdziarski A. Zech 1 F. Zefi 8 A. Ziegler N. Żywucka J. Katsuta
Abstract : The supernova remnant (SNR) W49B originated from a core-collapse supernova that occurred between one and four thousand years ago, and subsequently evolved into a mixed-morphology remnant, which is interacting with molecular clouds (MC). γ-ray observations of SNR/MC associations are a powerful tool to constrain the origin of Galactic cosmic-rays, as they can probe the acceleration of hadrons through their interaction with the surrounding medium and subsequent emission of non-thermal photons. The detection of a γ-ray source coincident with W49B at very high energies (VHE; E > 100 GeV) with the H.E.S.S. Cherenkov telescopes is reported together with a study of the source with 5 years of Fermi-LAT high energy γ-ray (0.06 - 300 GeV) data. The smoothly-connected combined source spectrum, measured from 60 MeV to multi-TeV energies, shows two significant spectral breaks at 304±20 MeV and 8.4+2.2−2.5 GeV, the latter being constrained by the joint fit from the two instruments. The detected spectral features are similar to those observed in several other SNR/MC associations and are found to be indicative of γ-ray emission produced through neutral-pion decay.
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H. Abdalla, A. Abramowski, F. Aharonian, F. Ait Benkhali, A. Akhperjanian, et al.. The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT. Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 612, pp.A5. ⟨10.1051/0004-6361/201527843⟩. ⟨hal-02410558⟩

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