27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Contribution Talk

-1- Lecture hall
Gamma-rays

HAWC Observations on Two Nearby Pulsar Wind Nebulae Constrain the Origin of Local Positrons

Speakers

  • Dr. Hao ZHOU

Primary authors

Abstract content

Nearby electron and positron accelerators, especially Pulsar Wind Nebulae, have been proposed as potential origins of the local multi-GeV positron excess. The HAWC Gamma-Ray Observatory has reported very extended TeV gamma-ray emission around two nearby middle-aged pulsars Geminga and B0656+14, suggesting ultra-relativistic electrons and positrons accelerated in our backyard. The gamma-ray profiles up to tens of parsecs around these two pulsars provide a direct constraint on the diffusion of electrons and positrons in the interstellar medium. We will present the spatial and spectral studies on these two TeV gamma-ray sources and the derived positron contribution at Earth.