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Cardillo, M.; Tavani, M.; Giuliani, A.; Yoshiike, S.; Sano, H.; Fukuda, T.; Fukui, Y.; Castelletti, G.; Dubner, G. "The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration" (2014) Astronomy and Astrophysics. 565
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Abstract:

The middle-aged supernova remnant (SNR) W44 has recently attracted attention because of its relevance regarding the origin of Galactic cosmic-rays. For the first time for a SNR, the gamma-ray missions AGILE and Fermi have established the spectral continuum below 200 MeV, which can be attributed to a neutral pion emission. Confirming the hadronic origin of the gamma-ray emission near 100 MeV is then of the greatest importance. Our paper is focused on a global re-assessment of all available data and models of particle acceleration in W44 with the goal of determining the hadronic and leptonic contributions to the overall spectrum on a firm ground. We also present new gamma-ray and CO NANTEN2 data on W44 and compare them to recently published AGILE and Fermi data. Our analysis strengthens previous studies and observations of the W44 complex environment and provides new information for more detailed modeling. In particular, we determine that the average gas density of the regions emitting 100 MeV-10 GeV gamma-rays is relatively high (n ~ 250-300 cm-3). The hadronic interpretation of the gamma-ray spectrum of W44 is viable and supported by strong evidence. It implies a relatively large value for the average magnetic field (B ≥ 102 μG) in the SNR surroundings, which is a sign of field amplification by shock-driven turbulence. Our new analysis establishes that the spectral index of the proton energy distribution function is p1 = 2.2 ± 0.1 at low energies and p2 = 3.2 ± 0.1 at high energies. We critically discuss hadronic versus leptonic-only models of emission taking radio and gamma-ray data into account simultaneously. We find that the leptonic models are disfavored by the combination of radio and gamma-ray data. Having determined the hadronic nature of the gamma-ray emission on firm ground, a number of theoretical challenges remain to be addressed. © ESO 2014.

Registro:

Documento: Artículo
Título:The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration
Autor:Cardillo, M.; Tavani, M.; Giuliani, A.; Yoshiike, S.; Sano, H.; Fukuda, T.; Fukui, Y.; Castelletti, G.; Dubner, G.
Filiación:INAF, IAPS, 00133 Rome, Italy
Dip. di Fisica, Univ. Tor Vergata, 00133 Rome, Italy
CIFS-Torino, 10133 Torino, Italy
INAF, IASF-Milano, 20133 Milan, Italy
Department of Physics and Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Instituto de Astronomía y Física del Espacio (IAFE), CC.67, Suc.28, 1428 Buenos Aires, Argentina
Palabras clave:Acceleration of particles; Astroparticle physics; Gamma rays: ISM; ISM: supernova remnants; Radiation mechanisms: non-thermal; Shock waves; Industry; Particle accelerators; Shock waves; Stars; Ultraviolet spectroscopy; Acceleration of particles; Astroparticle physics; Gamma rays: isms; ISM: supernova remnants; Radiation mechanisms: nonthermal; Gamma rays
Año:2014
Volumen:565
DOI: http://dx.doi.org/10.1051/0004-6361/201322685
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v565_n_p_Cardillo

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Citas:

---------- APA ----------
Cardillo, M., Tavani, M., Giuliani, A., Yoshiike, S., Sano, H., Fukuda, T., Fukui, Y.,..., Dubner, G. (2014) . The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration. Astronomy and Astrophysics, 565.
http://dx.doi.org/10.1051/0004-6361/201322685
---------- CHICAGO ----------
Cardillo, M., Tavani, M., Giuliani, A., Yoshiike, S., Sano, H., Fukuda, T., et al. "The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration" . Astronomy and Astrophysics 565 (2014).
http://dx.doi.org/10.1051/0004-6361/201322685
---------- MLA ----------
Cardillo, M., Tavani, M., Giuliani, A., Yoshiike, S., Sano, H., Fukuda, T., et al. "The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration" . Astronomy and Astrophysics, vol. 565, 2014.
http://dx.doi.org/10.1051/0004-6361/201322685
---------- VANCOUVER ----------
Cardillo, M., Tavani, M., Giuliani, A., Yoshiike, S., Sano, H., Fukuda, T., et al. The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration. Astron. Astrophys. 2014;565.
http://dx.doi.org/10.1051/0004-6361/201322685