Neutral pion emission from accelerated protons in the supernova remnant W44
We present the AGILE gamma-ray observations in the energy range 50MeV-10GeV of the supernova remnant (SNR) W44, one of the most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR (∼20, 000 years) and its ejecta expand in a dense medium as shown by a prominent radi...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Capítulo de libro |
Lenguaje: | Inglés |
Publicado: |
The American Astronomical Society
2011
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Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
Aporte de: | Registro referencial: Solicitar el recurso aquí |
LEADER | 10789caa a22016457a 4500 | ||
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001 | PAPER-27349 | ||
003 | AR-BaUEN | ||
005 | 20230711124140.0 | ||
008 | 190410s2011 xx ||||fo|||| 00| 0 eng|d | ||
024 | 7 | |2 scopus |a 2-s2.0-81155123634 | |
040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
100 | 1 | |a Giuliani, A. |4 aut |e autor | |
245 | 1 | 0 | |a Neutral pion emission from accelerated protons in the supernova remnant W44 |
260 | |c 2011 |b The American Astronomical Society | ||
270 | 1 | 0 | |m Giuliani, A.; INAF-IASF Milano, via E. Bassini 15, 20133 Milano, Italy |
506 | |2 openaire |e Política editorial |f info:eu-repo/semantics/openAccess | ||
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520 | 3 | |a We present the AGILE gamma-ray observations in the energy range 50MeV-10GeV of the supernova remnant (SNR) W44, one of the most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR (∼20, 000 years) and its ejecta expand in a dense medium as shown by a prominent radio shell, nearby molecular clouds, and bright [SII] emitting regions. We extend our gamma-ray analysis to energies substantially lower than previous measurements which could not conclusively establish the nature of the radiation. We find that gamma-ray emission matches remarkably well both the position and shape of the inner SNR shocked plasma. Furthermore, the gamma-ray spectrum shows a prominent peak near 1GeV with a clear decrement at energies below a few hundreds of MeV as expected from neutral pion decay. Here we demonstrate that (1) hadron-dominated models are consistent with all W44 multiwavelength constraints derived from radio, optical, X-ray, and gamma-ray observations; (2) ad hoc lepton-dominated models fail to explain simultaneously the well-constrained gamma-ray and radio spectra, and require a circumstellar density much larger than the value derived from observations; and (3) the hadron energy spectrum is well described by a power law (with index s = 3.0 ± 0.1) and a low-energy cut-off at E c = 6 ± 1GeV. Direct evidence for pion emission is then established in an SNR for the first time. © 2011. The American Astronomical Society. All rights reserved.. |l eng | |
536 | |a Detalles de la financiación: Japan Society for the Promotion of Science, JSPS, 21253003 | ||
536 | |a Detalles de la financiación: Japan Society for the Promotion of Science, JSPS, 23740149 | ||
593 | |a INAF-IASF Milano, via E. Bassini 15, 20133 Milano, Italy | ||
593 | |a INAF/IASF-Roma, via Del Fosso del Cavaliere 100, 00133 Roma, Italy | ||
593 | |a Dipartimento di Fisica, Università Degli Studi di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy | ||
593 | |a Consorzio Interuniversitario Fisica Spaziale (CIFS), villa Gualino, v. la Settimo Severo 63, 10133 Torino, Italy | ||
593 | |a INFN Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy | ||
593 | |a Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan | ||
593 | |a Instituto de Astronomia y Fisica Del Espacio (IAFE, CONICET-UBA), 1428 Buenos Aires, Argentina | ||
593 | |a Dipartimento di Fisica and INFN, Via Valerio 2, I-34127 Trieste, Italy | ||
593 | |a INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy | ||
593 | |a INFN-Pavia, Via Bassi 6, I-27100 Pavia, Italy | ||
593 | |a ASI-ASDC, Via G. Galilei, I-00044 Frascati (Roma), Italy | ||
593 | |a INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, strada 54, I-09012 Capoterra, Italy | ||
593 | |a ENEA-Frascati, Via E. Fermi 45, I-00044 Frascati (Roma), Italy | ||
593 | |a INAF/IASF-Palermo, Via U. La Malfa 153, I-90146 Palermo, Italy | ||
593 | |a INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy | ||
593 | |a Istituto Universitario di Studi Superiori (IUSS), viale Lungo Ticino Sforza 56, 27100 Pavia, Italy | ||
690 | 1 | 0 | |a ACCELERATION OF PARTICLES |
690 | 1 | 0 | |a COSMIC RAYS |
690 | 1 | 0 | |a GAMMA RAYS: GENERAL |
690 | 1 | 0 | |a ISM: SUPERNOVA REMNANTS |
700 | 1 | |a Cardillo, M. |4 aut |e autor | |
700 | 1 | |a Tavani, M. |4 aut |e autor | |
700 | 1 | |a Fukui, Y. |4 aut |e autor | |
700 | 1 | |a Yoshiike, S. |4 aut |e autor | |
700 | 1 | |a Torii, K. |4 aut |e autor | |
700 | 1 | |a Dubner, G. |4 aut |e autor | |
700 | 1 | |a Castelletti, G. |4 aut |e autor | |
700 | 1 | |a Barbiellini, G. |4 aut |e autor | |
700 | 1 | |a Bulgarelli, A. |4 aut |e autor | |
700 | 1 | |a Caraveo, P. |4 aut |e autor | |
700 | 1 | |a Costa, E. |4 aut |e autor | |
700 | 1 | |a Cattaneo, P.W. |4 aut |e autor | |
700 | 1 | |a Chen, A. |4 aut |e autor | |
700 | 1 | |a Contessi, T. |4 aut |e autor | |
700 | 1 | |a Del Monte, E. |4 aut |e autor | |
700 | 1 | |a Donnarumma, I. |4 aut |e autor | |
700 | 1 | |a Evangelista, Y. |4 aut |e autor | |
700 | 1 | |a Feroci, M. |4 aut |e autor | |
700 | 1 | |a Gianotti, F. |4 aut |e autor | |
700 | 1 | |a Lazzarotto, F. |4 aut |e autor | |
700 | 1 | |a Lucarelli, F. |4 aut |e autor | |
700 | 1 | |a Longo, F. |4 aut |e autor | |
700 | 1 | |a Marisaldi, M. |4 aut |e autor | |
700 | 1 | |a Mereghetti, S. |4 aut |e autor | |
700 | 1 | |a Pacciani, L. |4 aut |e autor | |
700 | 1 | |a Pellizzoni, A. |4 aut |e autor | |
700 | 1 | |a Piano, G. |4 aut |e autor | |
700 | 1 | |a Picozza, P. |4 aut |e autor | |
700 | 1 | |a Pittori, C. |4 aut |e autor | |
700 | 1 | |a Pucella, G. |4 aut |e autor | |
700 | 1 | |a Rapisarda, M. |4 aut |e autor | |
700 | 1 | |a Rappoldi, A. |4 aut |e autor | |
700 | 1 | |a Sabatini, S. |4 aut |e autor | |
700 | 1 | |a Soffitta, P. |4 aut |e autor | |
700 | 1 | |a Striani, E. |4 aut |e autor | |
700 | 1 | |a Trifoglio, M. |4 aut |e autor | |
700 | 1 | |a Trois, A. |4 aut |e autor | |
700 | 1 | |a Vercellone, S. |4 aut |e autor | |
700 | 1 | |a Verrecchia, F. |4 aut |e autor | |
700 | 1 | |a Vittorini, V. |4 aut |e autor | |
700 | 1 | |a Colafrancesco, S. |4 aut |e autor | |
700 | 1 | |a Giommi, P. |4 aut |e autor | |
700 | 1 | |a Bignami, G. |4 aut |e autor | |
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