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Measures of the Soft X-ray Excess as an Eigenvector 1 Parameter for Active Galactic Nuclei

Marziani, P.; Perea, J.; del Olmo, A. +2 more

We present a preliminary analysis of X-ray data of quasars in the context of the 4D eigenvector 1 parameter space (Sulentic et al. 2000a, b). 4DE1 serves as a surrogate H-R diagram for representing empirical diversity among quasars and identifying the physical drivers of the diversity. The soft X-ray spectral index (Γ_soft) was adopted a…