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Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT

Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT,10.1126/science.1182787,Science,A. A. Abdo,M. Ackermann,M. Ajello

Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT   (Citations: 2)
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A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, B. M. Baughman, K. Bechtol, R. Bellazzini, B. Berenjihttp://academic.research.microsoft.com/io.ashx?type=5&id=15094253&selfId1=0&selfId2=0&maxNumber=12&query=
Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ~1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 108 electron volts and 3 ×1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above ~109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.
Journal: Science , vol. 327, no. 5969, pp. 1103-1106, 2010
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