Journal
PHYSICAL REVIEW D
Volume 96, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.103013
Keywords
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Funding
- U.S. Department of Energy [DE-FG02-13ER41958, DE-AC02-07CH11359]
- NASA Grant [NNX15AB18G]
- Simons Foundation
- NSF [PHY-1404311]
- NASA [NNX15AB18G, 808515] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Physics [1404311] Funding Source: National Science Foundation
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Recent measurements of the Geminga and B0656 + 14 pulsars by the gamma-ray telescope HAWC (along with earlier measurements by Milagro) indicate that these objects generate significant fluxes of very high-energy electrons. In this paper, we use the very high-energy gamma-ray intensity and spectrum of these pulsars to calculate and constrain their expected contributions to the local cosmic-ray positron spectrum. Among models that are capable of reproducing the observed characteristics of the gamma-ray emission, we find that pulsars invariably produce a flux of high-energy positrons that is similar in spectrum and magnitude to the positron fraction measured by PAMELA and AMS-02. In light of this result, we conclude that it is very likely that pulsars provide the dominant contribution to the long perplexing cosmicray positron excess.
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