Value of X/O as a function of unabsorbed 2–10 keV luminosity. Left panel: X-WISSH quasars are plotted; BAL WISSH quasars are represented with green symbols, while non-BAL WISSH are represented with red symbols. Filled symbols indicate objects that have an LBT-LUCI optical spectrum. Star and diamond symbols indicate the presence of broad [OIII] emission lines and CIV shifts >2000 km s-1, respectively. Right panel: X-WISSH quasars (red stars) are compared to Chandra COSMOS, CDFS, and PG quasars. Blue triangles indicate the X-ray selected broad-line COSMOS AGN, while open circles indicate X-ray selected narrow-line COSMOS AGN. Unclassified X-ray selected AGN of both COSMOS and CDFS are represented with black crosses. Finally, yellow squares indicate PG quasars.
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