Constraints on Cosmic-Ray Origin Theories from TeV Gamma-Ray Observations

Details Constraints on Cosmic-Ray Origin Theories from TeV Gamma-Ray Observations Constraints on Cosmic-Ray Origin Theories from TeV Gamma-Ray Observations

1997-06-13

arxiv.org/abs/astro-ph/9706131v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to appear in proceedings of 25 ICRC (Durban)

Scientific paper

If supernova remnants (SNRs) are the sites of cosmic-ray acceleration, the associated nuclear interactions should result in observable fluxes of TeV gamma-rays from the nearest SNRs. Measurements of the gamma-ray flux from six nearby, radio-bright, SNRs have been made with the Whipple Observatory gamma-ray telescope. No significant emission has been detected and upper limits on the $>$300 GeV flux are reported. Three of these SNRs (IC443, gamma-Cygni and W44) are spatially coincident with low latitude unidentified sources detected with EGRET. These upper limits weaken the case for the simplest models of shock acceleration and energy dependent propagation.

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