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The Narrow-line Seyfert 1 galaxy 1H0707-495 is known to exhibit significantX-ray spectral variations. Its X-ray energy spectrum is characterized by astrong soft excess emission, an extremely deep iron K-edge structure at ~7 keV,and a putative iron L-line/edge feature at ~1 keV. We have found that theenergy spectrum of 1H0707-495 in 0.5-10 keV is successfully explained by a"variable double partial covering model" where the original continuum spectrum,which is composed of the soft multi-color disk blackbody component and the hardpower-law component, is partially covered by two ionized absorption layers withdifferent ionization states and the same partial covering fraction. Thelower-ionized and thicker absorption layer primarily explains the iron K-edgefeature, and the higher-ionized and thinner absorption layer explains theL-edge feature. We have discovered that the observed significantintensity/spectral variation within a ~ day is mostly explained by onlyvariation of the partial covering fraction. In our model, the intrinsicluminosity and spectral shape are hardly variable within a ~ day, while someintrinsic variability above 3 keV is recognized. This is consistent with thepicture that the multi-color disk blackbody spectrum is almost invariable inthis timescale, and the hard power-law component is more variable. We proposethat the observed spectral variation of 1H0707-495 is caused by threephysically independent variations with different timescales; (1) intrinsicluminosity variation over days, (2) variation of partial covering fraction at atimescale of hours, and (3) small intrinsic hard component variation above 3keV in a timescale of hours or less.

Interpretation of the X-ray Spectral Variation of 1H0707-495 with a Variable Double Partial Covering Model