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    Contributions from nearby pulsars to the local cosmic ray electron spectrum

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    Date
    2008
    Author
    Büsching, I.
    Venter, C.
    De Jager, O.C.
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    Abstract
    PSR J0437-4715 is one of the closest millisecond pulsars (MSPs) to Earth, lying at a distance of _140 pc. This pulsar has a characteristic age of 4.9 Gyr and a relatively low spindown power of _1034 ergs/s. During its rather long lifetime, a large fraction of the energy output has been in the form of multi-TeV electrons. In this paper, we investigate the possible contribution of this nearby MSP to the local interstellar electron spectrum (LIS). The old age of the system justifies a steady-state evaluation of the contribution from this pulsar to the LIS. We calculate the electron spectrum at the light cylinder in the framework of a General Relativistic polar cap (PC) model, and use this as an injection spectrum in a diffusion model. The younger Geminga pulsar is also very close to Earth and warrants investigation.Asteady-state approach is however no longer justified, so we use an impulsive injection model.Wewill present results of a study of the contribution from these pulsars to the cosmic ray (CR) LIS. Our calculations show that pulsars like Geminga can make a non-negligible contribution to the LIS.
    URI
    http://hdl.handle.net/10394/10953
    https://doi.org/10.1016/j.asr.2007.08.005
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