2001/08/01 by Ti-Pei Li, Ti-pei Li
Earth and Planetary Sciences · Physics and Astronomy · #Accretion (finance) #Accretion disc #Astrophysical Phenomena and Observations #Astrophysics #Blazar #Coherence (philosophical gambling strategy) #Domain (mathematical analysis) #Fourier analysis #Fourier transform #Frequency domain #Gamma ray #High-pressure geophysics and materials #Lag #Physics #Scale (ratio) #Spectral density #Statistics #Time domain #Time lag #astro-ph
paper · pdf · doi:10.1088/1009-9271/1/4/313
19 pages, 13 figures. To appear in Chin. J. Astron. Astrophys. 1, 313 (2001)
openalex publication_date 2001/08/01 · arxiv created 2001/09/26 · arxiv updated 2017/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantities characterizing temporal property, e.g., power density, coherence, and time lag, can be defined and calculated directly in the time domain without using the Fourier transformation. Spectral hardness, variability duration, and correlation between different characteristic quantities on different time scale can be studied in the time domain as well. The temporal analysis technique in the time domain is a powerful tool, particularly in studying rapid variability on short time scales (or in high frequencies). Results of studying variabilities of X-rays from Cyg X-1 with the analysis technique in the time domain and RXTE data reveal valuable clues to understanding production and propagation processes of X-rays and structure of accretion disk in the black hole system.