Is PSR J08554644 responsible for the 1.4 TeV electron spectral bump hinted by DAMPE?
arXiv:2010.12170 · doi:10.1093/mnras/staa3311
Abstract
DAMPE observation on the cosmic ray electron spectrum hints a narrow excess at 1.4 TeV. Although the excess can be ascribed to dark matter particles, pulsars and pulsar wind nebulae are believed to be a more natural astrophysical origin: electrons injected from nearby pulsars at their early ages can form a bump-like feature in the spectrum due to radiative energy losses. In this paper, with a survey of nearby pulsars, we find 4 pulsars that may have notable contributions to 1.4 TeV cosmic ray electrons. Among them, PSR J08554644 has a spin down luminosity more than 50 times higher than others and presumably dominates the electron fluxes from them. X-ray observations on the inner compact part (which may represent a tunnel for the transport of electrons from the pulsar) of PWN G267.001.0 are then used to constrain the spectral index of high energy electrons injected by the pulsar. We show that high-energy electrons released by PSR J08554644 could indeed reproduce the 1.4 TeV spectral feature hinted by the DAMPE with reasonable parameters.
arXiv comment6 pages, 5 figures, accepted by MNRAS
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