Abstract Direct correlation analysis is presented for a sample of 155 low-redshift bright X-ray selected ROSAT Seyfert 1 type AGN. We confirm the well-known relations between the strengths of Fe II, [O III] emission and the X-ray slope. We also detect striking correlations between Hβ redshift (or blueshift), flux ratios of Fe II to Hβ broad component. The physical driver of these correlations is most likely the Eddington ratio.
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