Pulsars as candidates of LHAASO sources J2226+6057, J1908+0621 and J1825-1326: The leptonic origin

Abstract

Recently, from 12 $\gamma$-ray Galactic sources, the LHAASO has detected ultrahigh-energy photons up to 1.4PeV. The $\gamma$-ray spectra of the sources J2226+6057, J1908+0621, J1825-1326 and the suggested origin pulsars near the sources have been published. In our previous work, we studied the hadronic $\gamma$-ray spectra of the sources J2226+6057, J1908+0621, J1825-1326 in terms of the Hertzian dipole model of pulsar. In this paper, we investigate the possibility of the leptonic origin of the $\gamma$-ray. We use the Hertzian dipole model to describe the pulsars around the sources. The electrons around the pulsars can be accelerated to PeV by the electromagnetic fields of pulsars. Under the assumption that the initial electrons are uniform distributed in a spherical shell between $10^7$ to $10^9$m around the pulsar, we obtain the energy distribution of electrons. The leptonic $\gamma$-ray spectra can be calculated through inverse Compton scattering processes. The leptonic $\gamma$-ray can roughly conform to the observation of LHAASO.

References in corpus (11)

• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Ab-initio pulsar magnetosphere: three-dimensional particle-in-cell simulations of oblique pulsars
• Three-dimensional numerical simulations of the pulsar magentoshere: Preliminary results
• Extended Very-High-Energy Gamma-Ray Emission Surrounding PSR J0622 + 3749 Observed by LHAASO-KM2A
• Klein-Nishina effect and the cosmic ray electron spectrum
• A pulsar wind nebula origin of the LHAASO-detected UHE gamma-ray sources
• Timing of 29 Pulsars Discovered in the PALFA Survey
• A new study towards PSR J1826-1334 and PSR J1826-1256 in the region of HESS J1825-137 and HESS J1826-130
• Spectrum and fraction of cosmic ray positrons: results of the anomalous diffusion approach
• Interpretation of the puzzling gamma-ray spectrum of the Geminga halo
• Pulsars as candidates of LHAASO sources J2226+6057, J1908+0621 and J1825-1326