| Thème(s) : |
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| Titre : |
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FERMI LARGE AREA TELESCOPE DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE VICINITY OF SNR W44 |
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| Auteur : |
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Y. Uchiyama, S. Funk, H. Katagiri, J. Katsuta, M. Lemoine-Goumard1, H. Tajima, T. Tanaka, D. F. Torres |
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| Laboratoire : |
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| équipe(s) de recherche : |
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GLAST |
| Résumé : |
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We report the detection of GeV γ-ray emission from the molecular cloud complex that surrounds the supernova remnant (SNR) W44 using the Large Area Telescope on board Fermi. While the previously reported γ-ray emission from SNR W44 is likely to arise from the dense radio-emitting filaments within the remnant, the γ-ray emission that appears to come from the surrounding molecular cloud complex can be ascribed to the cosmic rays (CRs) that have escaped from W44. The non-detection of synchrotron radio emission associated with the molecular cloud complex suggests the decay of π0 mesons produced in hadronic collisions as the γ-ray emission mechanism. The total kinetic energy channeled into the escaping CRs is estimated to be Wesc ~ (0.3-3) × 1050 erg, in broad agreement with the conjecture that SNRs are the main sources of Galactic CRs. |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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The Astrophysical Journal Letters |
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| Volume : |
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749 |
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| Page/Article : |
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L35 |
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| Mot(s)-clé(s) : |
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acceleration of particles – cosmic rays – ISM: supernova remnants – radiation mechanisms: non-thermal |
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