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Detection of the Characteristic Pion-Decay Signature in Supernova Remnants

Markus Ackermann Marco Ajello A. Allafort Luca Baldini Jean Ballet 1 Guido Barbiellini M. G. Baring D. Bastieri K. Bechtol R. Bellazzini R. D. Blandford E. D. Bloom E. Bonamente A. W. Borgland E. Bottacini T. J. Brandt 2 J. Bregeon M. Brigida Pascal Bruel 3 R. Buehler G. Busetto S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian 1 C. Cecchi Ö. Çelik E. Charles 4 S. Chaty R. C. G. Chaves A. Chekhtman C. C. Cheung J. Chiang G. Chiaro A. N. Cillis S. Ciprini R. Claus J. Cohen-Tanugi L. R. Cominsky J. Conrad S. Corbel 1 S. Cutini F. d'Ammando A. de Angelis F. de Palma C. D. Dermer E. Do Couto E Silva P. S. Drell A. Drlica-Wagner L. Falletti C. Favuzzi E. C. Ferrara A. Franckowiak Y. Fukazawa S. Funk P. Fusco 5 F. Gargano 5 S. Germani N. Giglietto P. Giommi F. Giordano 5 M. Giroletti T. Glanzman G. Godfrey I. A. Grenier 1 M.-H. Grondin J. E. Grove S. Guiriec D. Hadasch Y. Hanabata A. K. Harding M. Hayashida K. Hayashi E. Hays J. W. Hewitt A. B. Hill 6 R. E. Hughes M. S. Jackson T. Jogler G. Jóhannesson A. S. Johnson T. Kamae J. Kataoka J. Katsuta Jürgen Knödlseder M. Kuss J. Lande S. Larsson L. Latronico M. Lemoine-Goumard F. Longo F. Loparco 5 M. N. Lovellette P. Lubrano G. M. Madejski F. Massaro M. Mayer M. N. Mazziotta J. E. Mcenery J. Mehault 7 P. F. Michelson R. P. Mignani W. Mitthumsiri T. Mizuno A. A. Moiseev M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia T. Nakamori R. Nemmen E. Nuss 7 M. Ohno T. Ohsugi N. Omodei M. Orienti E. Orlando J. F. Ormes D. Paneque J. S. Perkins M. Pesce-Rollins F. Piron 7 G. Pivato S. Rainò R. Rando M. Razzano S. Razzaque A. Reimer O. Reimer S. Ritz C. Romoli M. Sánchez-Conde A. Schulz C. Sgrò P. E. Simeon E. J. Siskind David Stanley Smith 8 G. Spandre P. Spinelli F. W. Stecker A. W. Strong D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka J. G. Thayer J. B. Thayer D. J. Thompson S. E. Thorsett L. Tibaldo O. Tibolla M. Tinivella E. Troja Y. Uchiyama T. L. Usher J. Vandenbroucke V. Vasileiou 7 G. Vianello V. Vitale A. P. Waite M. Werner B. L. Winer K. S. Wood M. Wood R. Yamazaki Z. Yang S. Zimmer
Abstract : Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
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Submitted on : Tuesday, May 21, 2013 - 3:06:29 PM
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Markus Ackermann, Marco Ajello, A. Allafort, Luca Baldini, Jean Ballet, et al.. Detection of the Characteristic Pion-Decay Signature in Supernova Remnants. Science, American Association for the Advancement of Science, 2013, 339, pp.807-811. ⟨10.1126/science.1231160⟩. ⟨in2p3-00824307⟩

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