Abstract
Abstract A new X-ray spectro-temporal data-analysis method, which we call “the difference variation function method”, is introduced. It can analyze spectral and temporal variations of X-ray sources, and its merits are discussed in comparison with conventional data-analysis methods. The new method is being applied to Suzaku observation data of the Seyfert 1 galaxy MCG $-$ 6–30–15. Consequently, it has been found that the observed spectral and temporal variations on a time scale of $\approx$ 10–100 ks are mostly ascribed to variable partially absorbers in front of the central X-ray source, whereas the X-ray source is intrinsically variable mainly on time scales shorter than $\approx$ 10 ks.
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