Exploring the energy-dependent radiation properties in dissipative magnetospheres with Fermi pulsars

TL;DR

This study models pulsar high-energy emissions using FIDO magnetospheres, successfully reproducing observed light curves and spectra of Crab and Vela pulsars by simulating curvature radiation in energy-dependent regimes.

Contribution

It introduces a novel FIDO magnetosphere model with high conductivity outside the light cylinder to simulate pulsar emissions more accurately.

Findings

FIDO model reproduces Crab and Vela pulsar observations.

Energy-dependent light curves match Fermi data.

Spectral features align with observed high-energy emissions.

Abstract

The equatorial current sheets outside the light cylinder(LC) are thought as the promising site of the high energy emission based on the results of the recent numerical simulations. We explore the pulsar light curves and energy spectra by computing the curvature radiation based on the FIDO magnetospheres. The FIDO magnetospheres with a near force-free regime inside the LC and a finite but high conductivity outside the LC are constructed by a spectral algorithm. The pulsar high energy emission properties are explored by integrating the trajectories of the test particles under the influence of both the accelerating electric field and the curvature radiation losses. As an application, we compare the predicted energy-dependent light curves and energy spectra with those of the Crab and Vela pulsars published in Fermi 2PC catalog. We find that the observed characteristics of the light curves and energy spectra from Crab and Vela pulsars can be well reproduced by the FIDO model.