The Geminga fraction

被引:32
|
作者
Harding, Alice K.
Grenier, Isabelle A.
Gonthier, Peter L.
机构
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] CEA Saclay, AIM, Serv Astrophys, F-91191 Gif Sur Yvette, France
[3] Hope Coll, Dept Phys, Holland, MI 49423 USA
关键词
pulsars; gamma-ray sources; pulsar populations; non-thermal radiation;
D O I
10.1007/s10509-007-9435-6
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Radio-quiet gamma-ray pulsars like Geminga may account for a number of the unidentified EGRET sources in the Galaxy. The number of Geminga-like pulsars is very sensitive to the geometry of both the gamma-ray and radio beams. Recent studies of the shape and polarization of pulse profiles of young radio pulsars have provided evidence that their radio emission originates in wide cone beams at altitudes that are a significant fraction (1-10%) of their light cylinder radius. Such wide radio emission beams will be visible at a much larger range of observer angles than the narrow core components thought to originate at lower altitude. Using 3D geometrical modeling that includes relativistic effects from pulsar rotation, we study the visibility of such radio cone beams as well as that of the gamma-ray beams predicted by slot gap and outer gap models. From the results of this study, one can obtain revised predictions for the fraction of Geminga-like, radio quiet pulsars present in the gamma-ray pulsar population.
引用
收藏
页码:221 / 230
页数:10
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