# Pulsars Multi-Accelerator Radiation model Peking University.

## Presentation on theme: "Pulsars Multi-Accelerator Radiation model Peking University."— Presentation transcript:

Pulsars Multi-Accelerator Radiation model Peking University

Outline n The difficulties of present pulsar models n The apocalypse from observation & theoretical research n A new acceleration region and a new model n Properties of this model n Comparing to observations

Pulsars + - - + Null surface 1.Strong magnetic field 2.Rapidly rotation Pulsar

Difficulties of present model There are two kinds of models For Polar Gap Model (Muslimov & Harding 2003) Require small inclination angle and impact angle For Outer Gap Model (Cheng et al 1986, 1994, 2000...) No off-pulse emission No Tev cut-off Too sharp rise of pulse profile We will solve these problem here.

Observation Note The radio pulse is narrow. The gamma-ray pulse is wide. Bridge emission Off pulse emission

Spectra Observation Cut-Off

The apocalypse from observation Pulse profile show: n The radio radiation comes from a compact region while gamma-ray radiation comes from a wide region Spectra show n Tev cut-off require the radiation location not far from the pulsar

The theory of pulsar radiation Polar Gap Model n Radiation locates at the magnetic pole of the pulsar Outer Gap Model n Radiation locates outside the null surface,far from the pulsar

Reasons for Difficulties of Present Model For Polar Gap Model Require small inclination angle and impact angle Reason n Too near For Outer Gap Model No off-pulse emission No Tev cut-off Too sharp rise of pulse profile Reason Too far

New Radiation Location n We note the so called Mid-Gap n It locates near than Outer Gap n Farther than Polar Gap

Input Physics 1. The radiation direction 2. The intensity of radiation 3. NOTE: only at this time! We will calculate the physics very soon.

Abbreviation Correction n The abbreviation will affect the direction of radiation. V c c oo

The Calculation for the Radiation Map

Relative intensity

Radio? n We also consider the radio radiation in this region n Take the Inverse Compton Scatter model to calculate the radio radiation Have the intrinsic Beauty of Unification! n Not a machine made model

ICS model sketch map

The result of our model 1.Beam patterns 2.Pulse profile We have Bridge Emission Off-pulse Emission Soft rise and down Sight Line Vela

Vision

Multi-bands Fitting of Observations Vela Crab Geminga ICS model is used to give radio results Gamma-ray Radio

Predictions 1.Some pulsar could be only observed at certain bands 2.Some pulsar can be observed at many bands 3.Three components pulsar

Gamma-B Process n Gamma-B process 1.If the photons fly with some angle respect to the magnetic field 2.The photons have enough energy 3.Strong enough magnetic field The absorption ratio is Cm^-1

Geometry Condition

The Equation and Numeric Method n The Radiation Transfer Equation is rather hard to integrate. n Delta like and infinite integration

The Escape Membrane of the Photons Solve: To get the location of source

Spectra Result Tev cut-off Solve the spectra problem of outer gap Fit the crab

Our Work Study a new gamma-ray pulsar model with a new accelerator Investigate the possible acceleration mechanisms Discuss the physical and geometrical conditions of this region Discuss the spectra properties induced by gamma-B process Give the last escape membrane of photons. Compare our model with observation

Further Work Dynamic & Kinetic

Thanks