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FERMI LARGE AREA TELESCOPE DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE VICINITY OF SNR W44

Y. Uchiyama S. Funk H. Katagiri J. Katsuta M. Lemoine-Goumard 1 H. Tajima T. Tanaka D. F. Torres
1 GLAST
CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Abstract : 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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http://hal.in2p3.fr/in2p3-00695269
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Submitted on : Monday, May 7, 2012 - 4:38:17 PM
Last modification on : Monday, June 25, 2018 - 3:50:03 PM

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Y. Uchiyama, S. Funk, H. Katagiri, J. Katsuta, M. Lemoine-Goumard, et al.. FERMI LARGE AREA TELESCOPE DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE VICINITY OF SNR W44. The Astrophysical journal letters, Bristol : IOP Publishing, 2012, 749, pp.L35. ⟨10.1088/2041-8205/749/2/L35⟩. ⟨in2p3-00695269⟩

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