Magnetosphere Structure and the Annular Gap Model of Pulsars

Pulsar radio and gamma-ray emission has been studied for about forty years, yet no elaborated model is present to account for all the emission of pulsars from radio to gamma-ray hands. A reasonable emission model should present the mechanism for wide hand radiation. The magnetosphere structure and particle acceleration regions are the basis for solving problem, observations are important inputs to establish a reasonable model. In our work, both radio and gamma-ray observations have been considered. We will show how they can limit the radiation locations and radiation mechanisms. The advantages and disadvantages for different radiation locations (such as the polar gap, the outer gap and the annular gap) are discussed in comparison with observational facts. The annular gap model, an joint model for both radio and gamma-ray emissions, was proposed recently and reproduce successfully some important observational phenomenon, e.g., bi-drifting. We will also discuss for radio and gamma-ray observations of PSR B1055-52, and show that radiations come from the annular region and the core region. Success in reproducing many observational facts suggest that the annular gap is a promising model for pulsar multi-wavelength radiation.