The Application Of Two-layer Outer Gap Model In Vela-like Pulsars

Pulsars are highly magnetized, rapidly rotating neutron stars, which play im-portant roles in the physical and astrophysical studies because they can provide extreme conditions which can not obtained in the Earth. Since Fermi’s launch in2008, there are more than160pulsars have been detected by Fermi LAT, the detailed observations provide ways to study the physical processes in the magne-tosphere of pulsars. Here we study the high energy properties of two Vela-like pulsar under the framework of two-layer outer gap model. The two-layer outer gap model was proposed by Wang et al.(2010). In this model, the accelerator consists of two parts, i.e. the main acceleration region on the top of last-open field lines and the screening region around the upper boundary of the gap. In the main acceleration region, the charge density is much lower than the Goldreich-Julian charge density, and the charged particles are accelerated by the electric field along the magnetic field to emit multi-GeV photons. In the screening region, the charge density is larger than the Goldreich-Julian value to close the gap, and particles in this region are responsible for multi-100MeV photon emission. The two-layer outer gap model was used to explain phased-resolved spectrum of Vela pulsar by Wang et al.(2011). In this thesis, we first give a brief introduction about the basic properties and correlation theories of pulsars, and then apply the two-layer outer gap model to study the high energy properties of two Vela-like pulsars, i.e., PSRs J1952+3252and J2229+6114. The observations can be explained by this model.