Frequency resolved radio and high-energy emission of pulsars

TL;DR

This paper models multi-wavelength pulsar emission by simulating curvature radiation within the magnetosphere, producing phase-resolved spectra and light curves that match observations across radio to gamma-ray energies.

Contribution

It introduces a detailed simulation of pulsar emission assuming curvature radiation from specific magnetospheric regions, providing realistic multi-wavelength spectra and light curves.

Findings

Energy-dependent light curves and spectra are successfully modeled.

Realistic spectra are obtained with specific Lorentz factors for leptons.

The model explains multi-wavelength observations of pulsars.

Abstract

Context. Pulsars are detected as broadband electromagnetic emitters from the radio wavelength up to high and very high energy in the MeV/GeV and sometimes even in the TeV range. Multi-wavelength phase-resolved spectra and light curves offer an unrivalled opportunity to understand their underlying radiation mechanisms and to localize their emission sites and therefore the particle acceleration regions. Aims. In this paper, we compute pulsars multi-wavelength phase-resolved light-curves and spectra assuming that curvature radiation operates from inside the magnetosphere of a rotating vacuum magnet. Radio emission arises from the polar caps whereas gamma-ray energy emanates from the slot gaps in the vicinity of the separatrix between closed and open field lines. Methods. By integrating particle trajectories within the slot gaps, we compute energy dependent photon sky maps in the radio band (MHz-GHz) and in the gamma-ray band (MeV/GeV) for mono-energetic distribution functions of leptons. Results. We obtained many details of the energy dependent light curves and phase-resolved spectra from the radio wavelength up to the gamma-ray energies. Choosing Lorentz factors of {\gamma} = 30 for radio emitting particles and {\gamma} = 10^7 for gamma-ray emitting particles, we found realistic spectra accounting for the wealth of multi-wavelength pulsar observations.