X‐Ray Variability Coherence in the Time Domain | Zendy

Xiao Che | Zendy; Congzhan Liu | Zendy; T.-P. Li | Zendy

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X‐Ray Variability Coherence in the Time Domain

Author(s) -

Xiao Che,

Congzhan Liu,

T.-P. Li

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/513588

Subject(s) - coherence (philosophical gambling strategy) , fourier transform , time domain , coherence time , frequency domain , fourier analysis , fourier domain , physics , optics , algorithm , computer science , statistical physics , quantum mechanics , computer vision

A technique for calculation of variability coherence at different timescalesperformed directly in the time domain is introduced. Simulations are made tocompare the coherence spectrum derived by the time domain technique with thecoherence function by Fourier analysis. The results indicate that in comparisonwith the Fourier analysis the time domain technique is more powerful forrevealing signal coherence in noisy data. We apply the time domain technique tothe real data of the black hole binaries Cygnus X-1 and GX 339-4 and comparethe results with their Fourier coherence spectra.Comment: To be published in ApJ, 15 pages, 6 figure

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