Cosmic-Ray Positrons Produced by Pulsar Winds from Mature Gamma-Ray Pulsars
ZHANG Li1,2,3, K. S. Cheng1,2, MEI Dong-Cheng1,2,3
1Department of Physics, Yunnan University, Kunming 650091
2Department of Physics, University of Hong Kong, Pokfulam Road, HongKong
3Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011
Cosmic-Ray Positrons Produced by Pulsar Winds from Mature Gamma-Ray Pulsars
ZHANG Li1,2,3;K. S. Cheng1,2;MEI Dong-Cheng1,2,3
1Department of Physics, Yunnan University, Kunming 650091
2Department of Physics, University of Hong Kong, Pokfulam Road, HongKong
3Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011
Abstract： In the frame of the γ-ray pulsar outer gap model, e± pairs in the pulsar magnetosphere are produced by the cascade of e± pairs through synchrotron radiation of the return current from the outer gap. These pairs are accelerated mono-energetically to relativistic energies in the pulsar wind driven by low-frequency electromagnetic waves. Using Monte Carlo simulations, we generate a sample of the mature γ-ray pulsars in our Galaxy and calculate the positron production rate from these pulsars. With a simple leaky box model, we calculate the ratio of cosmic-ray positron to total electrons. Our result indicates that the pulsar contribution to the cosmic ray positron peaks at about 40 GeV and the observed e+/(e-+e+) ratio can be explained by this model.
ZHANG Li;;K. S. Cheng;MEI Dong-Cheng;. Cosmic-Ray Positrons Produced by Pulsar Winds from Mature Gamma-Ray Pulsars[J]. 中国物理快报, 2001, 18(5): 701-704.
ZHANG Li, , K. S. Cheng, MEI Dong-Cheng,. Cosmic-Ray Positrons Produced by Pulsar Winds from Mature Gamma-Ray Pulsars. Chin. Phys. Lett., 2001, 18(5): 701-704.
2001, Vol. 18 
