Reanalyze the pulsar scenario to explain the cosmic positron excess considering the recent developments

Abstract

As the TeV halos around Geminga and PSR B0656+14 have been confirmed by HAWC, slow diffusion of cosmic rays could be general around pulsars, and the cosmic positron spectrum from pulsars could be significantly changed. As a consequence, the most likely pulsar source of the positron excess, Geminga, is no more a viable candidate under the additional constraint from Fermi-LAT. Moreover, the latest measurement by AMS-02 shows a clear cutoff in the positron spectrum, which sets a strict constraint on the age of the pulsar source. Considering these new developments we reanalyze the scenario in this work. By checking all the observed pulsars under the two-zone diffusion scenario, we propose for the first time that PSR B1055-52 is a very promising source of the positron excess. B1055-52 can well reproduce both the intensity and the high-energy cut of the AMS-02 positron spectrum, and may also explain the H.E.S.S $e^{-}+e^{+}$ spectrum around 10 TeV. Moreover, if the slow diffusion is universal in the local interstellar medium, B1055-52 will be the unique reasonable source of the AMS-02 positron spectrum among the observed pulsars.

12 pages, 3 figures, 1 table

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• ASTRI Mini-Array Core Science at the Observatorio del Teide
• The Physics of Pulsar Halos: Research Progress and Prospect
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• Self-consistent interpretations of the multi-wavelength gamma-ray spectrum of LHAASO J0621$+$3755
• Positron Excess from Cosmic Ray Interactions in Galactic Molecular Clouds
• Interpretation of the puzzling gamma-ray spectrum of the Geminga halo
• Features of the gamma-ray pulsar halo HESS J1831$-$098
• Connecting multi-lepton anomalies at the LHC and in Astrophysics with MeerKAT/SKA
• Disclosing the catalog pulsars dominating the Galactic positron flux
• Constraining the slow-diffusion zone size and electron injection spectral index for the Geminga pulsar halo
• Constraints on the $e^{\pm }$ Pair Injection of Pulsar Halos: Implications from the Galactic Diffuse Multi-TeV Gamma-ray Emission
• Examining the secondary product origin of cosmic ray positrons with the latest AMS-02 data
• Relativistic astrospheres of gamma-ray binaries: modeling of non-thermal processes
• Geminga contribution to the cosmic-ray positron excess according to the gamma-ray observations
• PHECT: A lightweight computation tool for pulsar halo emission
• Possible spectral irregularities in the AMS-02 positron spectrum