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We investigate the relationship between X-ray and optical line emission in340 nearby AGN selected above 10 keV using Swift BAT. We find a weakcorrelation between the extinction corrected [O III] and hard X-ray luminosity(14-195 keV) with a [OIII] large scatter (R_Pear = 0.64, sigma = 0.62 dex) anda similarly large scatter with the intrinsic 2-10 keV to [O III] luminosities(RPear=0.63, sigma = 0.63 dex). Correlations of the hard X-ray fluxes with thefluxes of high-ionization narrow lines ([O III], He II, [Ne III] and [Ne V])are not significantly better than with the low ionization lines (Halpha,[SII]). Factors like obscuration or physical slit size are not found to be asignificant part of the large scatter. In contrast, the optical emission linesshow much better correlations with each other (sigma = 0.3 dex) than with theX-ray flux. The inherent large scatter questions the common usage of narrowemission lines as AGN bolometric luminosity indicators and suggests that otherissues such as geometrical differences in the scattering of the ionized gas orlong term AGN variability are important.

BAT AGN Spectroscopic Survey II: X-ray Emission and High Ionization Optical Emission Lines