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Broadband Observations and Modeling of the Shell-Type Supernova Remnant G347.3-0.5The supernova remnant G347.3-0.5 emits a featureless power law in X-rays, thought to indicate shock acceleration of electrons to high energies. We here produce a broadband spectrum of the bright northwest limb of this source by combining radio observations from the Australia Telescope Compact Array (ATCA), X-ray observations from the Advanced Satellite for Cosmology and Astrophysics (ASCA), and TeV gamma-ray observations from the CANGAROO imaging Cerenkov telescope. We assume that this emission is produced by an electron population generated by diffusive shock acceleration at the remnant forward shock. The nonlinear aspects of the particle acceleration force a connection between the widely different wavelength bands and between the electrons and the unseen ions, presumably accelerated simultaneously with the electrons. This allows us to infer the relativistic proton spectrum and estimate ambient parameters such as the supernova explosion energy, magnetic field, matter density in the emission region, and efficiency of the shock acceleration process. We find convincing evidence that the shock acceleration is efficient, placing greater than 25% of the shock kinetic energy flux into relativistic ions. Despite this high efficiency, the maximum electron and proton energies, while depending somewhat on assumptions for the compression of the magnetic field in the shock, are well below the observed 'knee' at 10(exp 15) eV in the Galactic cosmic-ray spectrum.
Document ID
20020039017
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Ellison, Donald C.
(North Carolina State Univ. Raleigh, NC United States)
Slane, Patrick O.
(Smithsonian Astrophysical Observatory Cambridge, MA United States)
Gaensler, Bryan M.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 20, 2013
Publication Date
February 1, 2002
Publication Information
Publication: A Study of the X-Ray Spectrum and Morphology of CTA 1: An X-Ray Study of the Supernova Remnant G347.5-0.5
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NAG5-4803
Distribution Limits
Public
Copyright
Other

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