X-ray variability coherence in the time domain

被引：0
|
作者：
Che, Xiao [1 ]
Liu, Cong-Zhan
Li, Ti-Pei
机构：
[1] Tsing Hua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
[2] Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
[3] Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
[4] Chinese Acad Sci, Inst High Energy Phys, Particle Astrophys Lab, Beijing, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2007年 / 660卷 / 02期
关键词：
methods : data analysis; X-rays : binaries; X-rays : stars;
D O I：
10.1086/513588
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A technique for calculation of variability coherence at different timescales performed directly in the time domain is introduced. Simulations are made to compare the coherence spectrum derived by the time-domain technique with the coherence function derived by Fourier analysis. The results indicate that in comparison with the Fourier analysis the time-domain technique is more powerful for revealing signal coherence in noisy data. We apply the time-domain technique to real data of the black hole binaries Cygnus X-1 and GX 339-4 and compare the results with their Fourier coherence spectra.
引用
收藏
页码：1393 / 1397
页数：5
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