The Study On Pulsar Synchro-Curvature Radiation Process

Pulsars are typical Galactic gamma-ray objects, charged particles can be accelerated to relativistic energies in the magnetosphere and then produce high energy radiations. However, there are still open questions about the locations of the accelerators, and the production and radiation processes of high energy particles. The prospective theoretical models include outer gap models, which firstly proposed by Cheng et al. in 1986 and developed in the followed studies by Cheng and his colleagues. Recently, Vigano et al. revised the outer gap model and obtained more compact expressions to calculate the spectrum. In this article, we studied the gamma-ray properties of pulsars based on the revised synchro-curvature radiation model, and tested the model by using Fermi-LAT pulsars observational data:1. We numerically calculated the dynamic equation of accelerated electrons and studied the properties of Lorenz factor and pitch angle, which change with the position in outer gap;2. We presented the numerical results about the parallel and perpendicular components of the energies and momentums, which expressed radiation transition from synchrotron-dominated to curvature-dominated regime di-rectly;3. We computed the average spectra based on the revised synchro-curvature model, and fitted the phase-averaged spectra of 33 gamma-ray pulsars by using the Levenberg-Marquardt method;4. We calculated the gamma-ray luminosities and conversion efficiencies, then compared the theoretical results with the observations. Finally, we explored the correlations about pulsar luminosities, gamma-ray conversion efficien-cies, spin down power and characteristic ages.Our results showed that the purely synchrotron or curvature losses are inad-equate to describe the radiative reaction on the particle motion. The calculations on energy spectra and luminosities indicate that the synchro-curvature radiation model can reasonably explain the observations.