Observational Properties of Radio Emission Beams of PSR J1906+0746 and Its Implication

In this paper, the properties of the main-pulse and interpulse radio emission beams were studied for PSR J1906+0746 by using the open data. By fitting the integrated pulse profile of each epoch with Gaussian components, we obtained the corresponding 10% peak pulse width and the peak flux density, and then analyzed the relationships between them and the impact angle. The results show that the major visible part of the emission beam of the main pulse is generated by a magnetic flux tube with a certain range of magnetic longitude, while the emission of the interpulse comes from magnetic field lines around the magnetic axis. The properties of the main pulse can be well explained by the existing fan beam models, but the properties of the interpulse are difficult to interpret by the fan beam models, which requires the improvement of the fan beam model. Under the assumption that radio radiation can be generated along the magnetic field lines around the magnetic axis, the observed strip-shaped emission beam can be simulated by reasonable selection of the model parameters.