Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 61, Issue 6, Pages 1331-1354Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/61.6.1331
Keywords
galaxies: active; galaxies: Seyfert; X-rays: galaxies
Categories
Funding
- JSPS of Japan
- MEXT of Japan
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36 AGN data observed by Suzaku were compiled to examine the temporal variability in different energy bands covered by soft X-ray imaging systems (XRT + XIS: 0.5-10keV) and Hard X-ray Detector (HXD: 15-50keV) aboard Suzaku. Three band light curves were obtained in L (0.5-2 keV), M (2-10 keV), and H (15-50 keV) with a time binning of 5760s. The, L-band flux change was almost proportional to that of the M-band without offsets in most of type-1 AGNs. The slope (= dL/dM) of the correlation changed by more than a factor of 10 from Seyfert 2 to narrow-line Seyfert I galaxies (NLS1). The power-law component can explain the slope of Seyfert I galaxies with a typical index, Gamma, of 1.9. For NLS1s with steeper slopes, an additional soft excess component is needed, whose variation should be proportional to that of the power-law component. It gives a new constraint to models for the soft excess component. The H-band flux change is a linear function of the M-band flux with a significant offset in the H-band. The slope can be explained by the power-law component with an absorption column from 10(22-24) cm(-1). The offset can be attributed to the reflection component, which is stable on a time scale of days.
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