The influence of small scale magnetic field on the polar cap X-ray luminosity of old radio pulsars

2nd International Symposium on the Modern Physics of Compact Stars and Relativistic Gravity

物理学;天文学

Barsukov, D.P.^1,2 ; Goglichidze, O.A.^1 ; Tsygan, A.I.^1

Ioffe Physical-Technical Institute, Russian Academy of Sciences, Saint-Petersburg, Russia^1

Saint-Petersburg State Polytechnical University, Saint-Petersburg, Russia^2

关键词: Electron flow;    Electron positron pair production;    Primary electrons;    Radio pulsars;    Rapid screening;    Screening models;    Space-charge limited;    X-ray luminosity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/496/1/012012/pdf
DOI  :  10.1088/1742-6596/496/1/012012

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The influence of small-scale magnetic field on the polar cap heating by returning positrons is considered. The returning positron current is calculated in the framework of two models of rapid and gradual screening. To calculate the electron-positron pair production rate we take into account only the curvature radiation of primary electrons and its absorption in magnetic field. We use the polar cap model with steady space charge limited electron flow. It is shown that the rapid screening model is in the better agreement with observations of old (age > 106years) radio pulsars. The gradual screening model usually leads to too strong heating and too large X-ray luminosities.