TeV cosmic ray electrons from millisecond pulsars

Abstract

Recent γ-ray observations suggest that the γ-ray millisecond pulsar (MSP) population is separated into two sub-classes with respect to the pair multiplicity. Here, we calculate the cosmic ray electron/positron spectra from MSPs. Based on the assumption of the equipartition in the pulsar wind region the typical energy of electrons/positrons ejected by a MSP with the pair multiplicity of order unity is \sim 50 TeV. In this case, we find that a large peak at 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%, the large peak would be detectable in the 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 dominant MSP population is \sim 10^3, electrons/positrons from them may contribute to the observed excess from the background electron/positron flux and positron fraction.

11 pages, 3 figures, submitted to MNRAS

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• Cosmic-ray positrons from millisecond pulsars
• Gamma-ray and X-ray emission from the Galactic Centre: hints on the nuclear star cluster formation history
• GeV-TeV Cosmic Ray Leptons in the Solar System from the Bow Shock Wind Nebula of the Nearest Millisecond Pulsar J0437-4715
• Constraining positron emission from pulsar populations with AMS-02 data
• Pevatron at the Galactic Center: Multi-Wavelength Signatures from Millisecond Pulsars
• Millisecond Pulsars Modify the Radio-SFR Correlation in Quiescent Galaxies
• Electron and positron spectra in the three dimensional spatial-dependent propagation model
• Possible bump structure of cosmic ray electrons unveiled by AMS-02 data and its common origin along with the nuclei and positron
• Monte Carlo Study of Electron and Positron Cosmic-Ray Propagation with the CALET Spectrum
• On the PeV knee of cosmic rays spectrum and TeV cutoff of electron spectrum
• The Contribution of Millisecond Pulsars to the Galactic Cosmic-Ray Lepton Spectrum