GAMMA-RAY LIGHT CURVES FROM PULSAR MAGNETOSPHERES WITH FINITE CONDUCTIVITY

被引：50

作者：

Kalapotharakos, Constantinos ^{[1
,2
]}

Harding, Alice K. ^{[2
]}

Kazanas, Demosthenes ^{[2
]}

Contopoulos, Ioannis ^{[3
]}

机构：

[1] Univ Maryland, Coll Pk UMDCP CRESST, College Pk, MD 20742 USA

[2] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[3] Acad Athens, Res Ctr Astron & Appl Math, Athens 11527, Greece

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 754卷 / 01期

关键词：

gamma rays: stars; pulsars: general; stars: neutron; AREA TELESCOPE; SLOT GAPS; MAGNETIC-FIELD; VELA PULSAR; EMISSION; RADIATION; GEOMETRY; MODEL;

D O I：

10.1088/2041-8205/754/1/L1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the shapes of gamma-ray pulsar light curves using three-dimensional pulsar magnetosphere models of finite conductivity. These models, covering the entire spectrum of solutions between vacuum and force-free magnetospheres, for the first time afford mapping the GeV emission of more realistic, dissipative pulsar magnetospheres. To this end we generate model light curves following two different approaches: (1) We employ the emission patterns of the slot and outer gap models in the field geometries of magnetospheres with different conductivity sigma. (2) We define realistic trajectories of radiating particles in magnetospheres of different sigma and compute their Lorentz factor under the influence of magnetospheric electric fields and curvature radiation-reaction; with these at hand we then calculate the emitted radiation intensity. The light curves resulting from these prescriptions are quite sensitive to the value of sigma, especially in the second approach. While still not self-consistent, these results are a step forward in understanding the physics of pulsar gamma-radiation.

引用

页数：5

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