PSR J 20213651 and Pulsar Wind Tori Fitting

PSR J 2021+3651 and Pulsar Wind Tori Fitting Stephen C. -Y. Ng (Romani Group) GLAST Lunch Talk 5/12/05

Outline v v v Gamma-ray Pulsars from 3 EG catalogue Chandra Observation of PSR J 2021+3651 Examples of PWN from Chandra Tori Fitting Results & applications Summary GLAST Lunch Talk 5/12/05

Gamma-ray Pulsars • Egret: Vela, Geminga, PSR B 1706 -44, … • More for GLAST • PSR J 2021+3651 (Hessels et. al 04) – 103. 7 ms period radio pulsar – Coincident with Egret Source Ge. V 2020+3658 – 19 ks Chandra X-ray Observation GLAST Lunch Talk 5/12/05

PSR J 2021+3651 Spectral parameters GLAST Lunch Talk 5/12/05

PWNe from Chandra GLAST Lunch Talk 5/12/05

More examples GLAST Lunch Talk 5/12/05

Model Torus 3 D torus model (Ng & Romani 03) Parameters: Y, z, r, d, b, d Poisson statistics, max likelihood Error estimation -- Monte Carlo Simulation GLAST Lunch Talk 5/12/05

Results GLAST Lunch Talk 5/12/05

Results GLAST Lunch Talk 5/12/05

Applications • Viewing Geometry for Gamma Ray emission (Romani & Yadigaroglu 95) • Spin axis - proper motion alignment => Pulsar kick => Core collapse physics GLAST Lunch Talk 5/12/05

Crab Pulsar Kick V GLAST Lunch Talk 5/12/05 Vela V

Summary • PSR J 2021+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. GLAST Lunch Talk 5/12/05