TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess

Details TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess TeV Gamma Rays from Geminga and the Origin of the GeV Positron Excess

2008-10-16

arxiv.org/abs/0810.2784v4

Phys.Rev.Lett.103:051101,2009

Astronomy and Astrophysics

Astrophysics

4 pages and 3 figures; Minor revisions, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.051101

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 can plausibly account for the multi-GeV positron excess that has evaded explanation. We explore a number of testable predictions for gamma-ray and electron/positron experiments (up to ~100 TeV) that can confirm the first "direct" detection of a cosmic-ray source.

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