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PSR J2021+3651 and Pulsar Wind Tori Fitting

Stephen C.-Y. Ng (Romani Group). PSR J2021+3651 and Pulsar Wind Tori Fitting. Outline. Gamma-ray Pulsars from 3EG catalogue Chandra Observation of PSR J2021+3651 Examples of PWN from Chandra Tori Fitting Results & applications Summary. Gamma-ray Pulsars.

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PSR J2021+3651 and Pulsar Wind Tori Fitting

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  1. Stephen C.-Y. Ng (Romani Group) PSR J2021+3651 and Pulsar Wind Tori Fitting

  2. Outline • Gamma-ray Pulsars from 3EG catalogue • Chandra Observation of PSR J2021+3651 • Examples of PWN from Chandra • Tori Fitting • Results & applications • Summary

  3. Gamma-ray Pulsars • Egret: Vela, Geminga, PSR B1706-44,… • More for GLAST • PSR J2021+3651 (Hessels et. al 04) • 103.7ms period radio pulsar • Coincident with Egret Source GeV2020+3658 • 19ks Chandra X-ray Observation

  4. Spectral parameters PSR J2021+3651

  5. PWNe from Chandra

  6. More examples

  7. 3D torus model (Ng & Romani 03) • Parameters: Y, z,r, d, b, d • Poisson statistics, max likelihood • Error estimation • -- Monte Carlo Simulation Model Torus

  8. Results

  9. Results

  10. Applications • Viewing Geometry for Gamma Ray emission (Romani & Yadigaroglu 95) • Spin axis - proper motion alignment=> Pulsar kick=> Core collapse physics

  11. Vela V V Pulsar Kick Crab

  12. Summary • PSR J2021+3651, which coincident with Egret source, shows PWN structure. • Toroidal PWN is observed in many in energetic young pulsars. • Torus model Fitting gives the viewing geometry: -- to understand Gamma-ray emission mechanism. -- to investigate spin-kick which gives new information on NS birth properties.

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