TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
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Publisher:American Physical Society
Citation:Hasan Yuksel, Matthew D. Kistler, Todor Stanev, "TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess," Physical Review Letters 103, no. 5 (2009), doi: 10.1103/PhysRevLett.103.051101
The Geminga pulsar has long been one of the most intriguing MeV-GeV γ-ray point sources. We examine the implications of the recent Milagro γ-ray Observatory detection of extended, multi-TeV γ-ray emission from Geminga, finding that this reveals the existence of an ancient, powerful cosmic-ray accelerator that can plausibly account for the multi-GeV positron excess that has evaded explanation. We explore a number of testable predictions for γ-ray and electron or positron experiments (up to ∼100 TeV) that can confirm the first “direct” detection of a cosmic-ray source.
Rights:©2009 The American Physical Society
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