The Optical-to-X-ray Spectral Energy Distribution of Soft X-ray Selected AGN with Swift

摘要

We present the results of our intensive observing campaign of 91 soft X-ray selected AGN with Swift which we started in 2005. This is the largest AGN sample with simultaneous optical to X-ray observations to study the spectral energy distribution of AGN. The principal motivation of this study is to understand the spectral energy distributions of AGN in the optical/UV to X-ray regime and to provide bolometric corrections which arc important in determining the Eddington ratio L/L_(Edd). We find strong correlations between the X-ray spectral slope a and the optica/UV spectral slope wuv with L/L_(Edd). We notice a saturation in the αx - L/L_(Edd) relation for AGN with X-ray Pectral slopes steeper than ≈ 1.6. A strong anti-correlation between αuv and L/L_(Edd) is found with an offset between Narrow-Line Seyfert is and Broad-Line Seyfert ls.