Encounters
Power Spectral Density (PSD) ○◂｜encounter｜ENC｜20260908185746-01-•
Our most important resource for examining the near-vicinity of a BH is the rapid variations in X-ray intensity that are so often observed (van der Klis 2005; McClintock & Remillard 2006). The analysis tool commonly used for probing fast variability is the power-density spectrum (PDS) (e.g., Leahy et al. 1983). Related techniques for computing coherence and phase lag functions are reviewed by Vaughan & Nowak (1997). PDSs are interpreted with the presumption that the source variations are a locally stationary process. More generalized considerations of time series analyses are given by Scargle (1981), while recent topics in nonlinear processes are well described by Gliozzi, Papadakis, & Räth (2006).
Source: Remillard & McClintock 2006 ┃ X-Ray Properties… ⚬𓂃
Link to original