Abstract
This paper presents a analysis of X-ray variability for a assembled sample of broad-line Seyfert 1, narrow-lines Seyfert 1 galaxies and QSOs observed by ASCA, whose central black masses have been estimated. We find the significant relation between X-ray variability and the central black masses is different for Broad-line and Narrow-lines galaxies. The higher excess variance of narrow-line galaxies can be explained that they have smaller size of X-ray emission region compare to the broad-line objects. Our findings favor the hypothesis that the narrow-line galaxies have rotational black hole and hence maybe have the jets.
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