TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess
Abstract
The Geminga pulsar has long been one of the most intriguing MeV-GeV gamma-ray point sources. We examine the implications of the recent Milagro detection of extended, multi-TeV gamma-ray emission from Geminga, finding that this reveals the existence of an ancient, powerful cosmic-ray accelerator that also can plausibly account for the multi-GeV positron excess that has evaded explanation. We explore a number of testable predictions for gamma-ray, electron/positron, and neutrino experiments that can confirm the first direct detection of a cosmic-ray source.Keywords
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