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Aubert, P.; Backes, M.; Balzer, A.; Barnard, M.; Becherini, Y.; Boisson, C.; Bregeon, J.; Brun, F.; Bryan, M.; Carr, J.; Chrétien, M.; Colafrancesco, S.; Conrad, J.; Decock, J.; Degrange, B.; Domainko, W.; Dubus, G.; Dutson, K.; Dyks, J.; Eger, P.; Ernenwein, J.-P.; Fiasson, A.; Förster, A.; Funk, S.; Gabici, S.; Gajdus, M.; Garrigoux, T.; Hahn, J.; Heinzelmann, G.; Hervet, O.; Hinton, J. A.; Hoischen, C.; Horns, D.; Jacholkowska, A.; Janiak, M.; Jankowsky, F.; Jogler, T.; Katz, U.; Kerszberg, D.; Kieffer, M.; King, J.; Kluźniak, W.; Krakau, S.; Laffon, H.; Lau, J.; Lees, J.-P.; Lefranc, V.; Lemoine-Goumard, M.; Leser, E.; Lohse, T.; Liu, R.; López-Coto, R.; Marandon, V.; Maurin, G.; Niemiec, J.; Oakes, L.; Öttl, S.; Ohm, S.; Piel, Q.; Pühlhofer, G.; Punch, M.; Reimer, A.; Renaud, M.; de los Reyes, R.; Romoli, C.; Rowell, G.; Rulten, C. B.; Sanchez, D. A.; Santangelo, A.; Sasaki, M.; Settimo, M.; Shafi, N.; Sol, H.; Spengler, G.; Spies, F.; Steenkamp, R.; Stegmann, C.; Stycz, K.; Sushch, I.; Terrier, R.; Tibaldo, L.; Tiziani, D.; Tluczykont, M.; van der Walt, D. J.; van Eldik, C.; van Soelen, B.; Veh, J.; Viana, A.; Voisin, F.; Völk, H. J.; Vuillaume, T.; Wagner, S. J.; Willmann, P.; Wörnlein, A.; Wouters, D.; Yang, R.; Zabalza, V.; Zefi, F.; Ziegler, A.; Żywucka, N.
Astronomy and astrophysics (Berlin), 04/2018, Letnik: 612Journal Article
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). Gamma-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. We report 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 together with a study of the source with five 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 8.4−2.5+2.2 $8.4_{-2.5}^{+2.2}$ 8.4 −2.5 +2.2 GeV; the latter is 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.
