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Giuliani, A.; Cardillo, M.; Tavani, M.; Fukui, Y.; Yoshiike, S.; Torii, K.; Dubner, G.; Castelletti, G.; Barbiellini, G.; Bulgarelli, A.; Caraveo, P.; Costa, E.; Cattaneo, P.W.; Chen, A.; Contessi, T.; Del Monte, E.; Donnarumma, I.; Evangelista, Y. (...) Bignami, G. "Neutral pion emission from accelerated protons in the supernova remnant W44" (2011) Astrophysical Journal Letters. 742(2)
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Abstract:

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..

Registro:

Documento: Artículo
Título:Neutral pion emission from accelerated protons in the supernova remnant W44
Autor:Giuliani, A.; Cardillo, M.; Tavani, M.; Fukui, Y.; Yoshiike, S.; Torii, K.; Dubner, G.; Castelletti, G.; Barbiellini, G.; Bulgarelli, A.; Caraveo, P.; Costa, E.; Cattaneo, P.W.; Chen, A.; Contessi, T.; Del Monte, E.; Donnarumma, I.; Evangelista, Y.; Feroci, M.; Gianotti, F.; Lazzarotto, F.; Lucarelli, F.; Longo, F.; Marisaldi, M.; Mereghetti, S.; Pacciani, L.; Pellizzoni, A.; Piano, G.; Picozza, P.; Pittori, C.; Pucella, G.; Rapisarda, M.; Rappoldi, A.; Sabatini, S.; Soffitta, P.; Striani, E.; Trifoglio, M.; Trois, A.; Vercellone, S.; Verrecchia, F.; Vittorini, V.; Colafrancesco, S.; Giommi, P.; Bignami, G.
Filiación:INAF-IASF Milano, via E. Bassini 15, 20133 Milano, Italy
INAF/IASF-Roma, via Del Fosso del Cavaliere 100, 00133 Roma, Italy
Dipartimento di Fisica, Università Degli Studi di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy
Consorzio Interuniversitario Fisica Spaziale (CIFS), villa Gualino, v. la Settimo Severo 63, 10133 Torino, Italy
INFN Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy
Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Instituto de Astronomia y Fisica Del Espacio (IAFE, CONICET-UBA), 1428 Buenos Aires, Argentina
Dipartimento di Fisica and INFN, Via Valerio 2, I-34127 Trieste, Italy
INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy
INFN-Pavia, Via Bassi 6, I-27100 Pavia, Italy
ASI-ASDC, Via G. Galilei, I-00044 Frascati (Roma), Italy
INAF, Osservatorio Astronomico di Cagliari, Poggio dei Pini, strada 54, I-09012 Capoterra, Italy
ENEA-Frascati, Via E. Fermi 45, I-00044 Frascati (Roma), Italy
INAF/IASF-Palermo, Via U. La Malfa 153, I-90146 Palermo, Italy
INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
Istituto Universitario di Studi Superiori (IUSS), viale Lungo Ticino Sforza 56, 27100 Pavia, Italy
Palabras clave:acceleration of particles; cosmic rays; gamma rays: general; ISM: supernova remnants
Año:2011
Volumen:742
Número:2
DOI: http://dx.doi.org/10.1088/2041-8205/742/2/L30
Título revista:Astrophysical Journal Letters
Título revista abreviado:Astrophys. J. Lett.
ISSN:20418205
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20418205_v742_n2_p_Giuliani

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Citas:

---------- APA ----------
Giuliani, A., Cardillo, M., Tavani, M., Fukui, Y., Yoshiike, S., Torii, K., Dubner, G.,..., Bignami, G. (2011) . Neutral pion emission from accelerated protons in the supernova remnant W44. Astrophysical Journal Letters, 742(2).
http://dx.doi.org/10.1088/2041-8205/742/2/L30
---------- CHICAGO ----------
Giuliani, A., Cardillo, M., Tavani, M., Fukui, Y., Yoshiike, S., Torii, K., et al. "Neutral pion emission from accelerated protons in the supernova remnant W44" . Astrophysical Journal Letters 742, no. 2 (2011).
http://dx.doi.org/10.1088/2041-8205/742/2/L30
---------- MLA ----------
Giuliani, A., Cardillo, M., Tavani, M., Fukui, Y., Yoshiike, S., Torii, K., et al. "Neutral pion emission from accelerated protons in the supernova remnant W44" . Astrophysical Journal Letters, vol. 742, no. 2, 2011.
http://dx.doi.org/10.1088/2041-8205/742/2/L30
---------- VANCOUVER ----------
Giuliani, A., Cardillo, M., Tavani, M., Fukui, Y., Yoshiike, S., Torii, K., et al. Neutral pion emission from accelerated protons in the supernova remnant W44. Astrophys. J. Lett. 2011;742(2).
http://dx.doi.org/10.1088/2041-8205/742/2/L30