Neutral Pion Emission from Accelerated Protons in the Supernova Remnant W44

@inproceedings{Giuliani2011NeutralPE,
  title={Neutral Pion Emission from Accelerated Protons in the Supernova Remnant W44},
  author={Andrea Giuliani and Martina Cardillo and Marco Tavani and Yasuo Fukui and Satoshi Yoshiike and Kazufumi Torii and Gloria Mabel Dubner and Gabriela Marta Castelletti and Guido Barbiellini and Andrea Bulgarelli and Patrizia A. Caraveo and Enrico Costa and Paolo Walter Cattaneo and Andrew W. Chen and T. Contessi and Ettore Del Monte and Immacolata Donnarumma and Yuri Evangelista and Marco Feroci and Fabiola Gianotti and Francesco Lazzarotto and Francesca Lucarelli and Francesco Longo and Martino Marisaldi and Sandro Mereghetti and Luigi Pacciani and Alberto Pellizzoni and Giovanni Piano and Piergiorgio Picozza and Carlotta Pittori and G. Pucella and Massimo Rapisarda and A. Rappoldi and Silvia Sabatini and Paolo Soffitta and Edoardo Striani and Massimo Trifoglio and Alessio Trois and Stefano Vercellone and Francesco Verrecchia and Valerio Vittorini and Sergio Colafrancesco and Paolo Giommi and Giovanni Fabrizio Bignami},
  year={2011}
}
We present the AGILE gamma-ray observations in the energy range 50 MeV-10 GeV of the supernova remnant (SNR) W44, one of the most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR ({approx}20, 000 years) and its ejecta expand in a dense medium as shown by a prominent radio shell, nearby molecular clouds, and bright [S II] emitting regions. We extend our gamma-ray analysis to energies substantially lower than previous measurements which could not conclusively… CONTINUE READING

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