用位相相关方法测量Geminga脉冲星的守时参数  

Timing Analysis of the Gamma ray Pulsar Geminga with a Phase Cross correlation Method

作　　者：张澍[1] 李惕碚[1] 吴枚[1] 卢方军[1] 宋黎明[1] 

机构地区：[1]中国科学院高能物理研究所

出　　处：《天体物理学报》1997年第4期380-385,共6页

基　　金：国家自然科学基金

摘　　要：利用γ射线脉冲星Ｇｅｍｉｎｇａ自旋及频率变化的稳定性，采用位相相关的方法分析了ＥＧＲＥＴ对脉冲星Ｇｅｍｉｎｇａ四次观测间隔较长的数据，得到较为准确的守时参数ｆ．位相相关的结果与更长数据段折叠搜索的结果较为接近，表明对于自旋和频率变化都较为稳定的γ射线脉冲星，位相相关分析方法可以作为提高脉冲星参数精度的有效方法．Considering the stability of Geminga, we have made aphase correlation analysis of the data from four viewing periods ofEGRET which were separated by long time intervals. The results ofphase cross correlation are similar to those obtained byparameter searching using more EGRET data. This indicates that thephase cross correlation method could be applied to deriving moreaccurate parameters of stable gamma ray pulsars.

关 键 词：脉冲星 GEMINGA Γ射线源 守时参数 位相相关法 

分 类 号：P145.6[天文地球—天体物理]