Journal Article

TeV cosmic‐ray electrons from millisecond pulsars

Shota Kisaka and Norita Kawanaka

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 4, pages 3543-3549
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20576.x
TeV cosmic‐ray electrons from millisecond pulsars

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Recent γ‐ray observations by Fermi Gamma‐Ray Space Telescope suggest that the γ‐ray millisecond pulsar (MSP) population is separated into two subclasses with respect to pair multiplicity. Here, we calculate the cosmic‐ray electron/positron spectra from MSPs. Based on the assumption of equipartition in the pulsar‐wind region, the typical energy of electrons/positrons ejected by a MSP with pair multiplicity of the order of unity is ∼50 TeV. In this case, we find that a large peak in the 10–50 TeV energy range would be observed in the cosmic‐ray electron/positron spectrum. Even if the fraction of pair‐starved MSPs is 10 per cent, a large peak would be detectable in future observations. We also calculate the contribution from MSPs with high pair multiplicity to the electron/positron spectrum. We suggest that if the multiplicity of the dominant MSP population is ∼103, electrons/positrons from this population may contribute to the observed excess from the background electron/positron flux and positron fraction.

Keywords: stars: neutron; cosmic rays

Journal Article.  4576 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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