... AGNs[*]
Based on data obtained at the VLT through the ESO program 73.A-0598(A).
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... X/O)[*]
${\rm X/O} = F_{\rm X}/F_{\rm opt}= F_{\rm X} /10^{-(0.4~R+5.4)}$, where $F_{\rm X}$ is the observed X-ray flux in the band 2-10 keV (in units of $\rm erg~s^{-1}~cm^{-2}$) and R is the R-band magnitude.
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... symbols[*]
Barger et al. (2003) list the photometry in the HK' filter. We converted this photometry into K band by using the relation HK'-K = 0.13+0.05(I-K), provided in the same paper.
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... type[*]
The intrinsic shape of the standard stars was corrected by using the spectral libraries of Pickles (1998) or through the method discussed in Maiolino et al. (1996) in the case of late type main sequence stars.
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...(Perola et al. 2004)[*]
The extinction expected from the X-ray absorbing column density assuming a Galactic gas-to-dust ratio and extinction curve is higher ($A_{\rm V}$(exp) $\sim$ 10 mag) than inferred from the near-IR spectrum, but marginally consistent given the errors on $N_{\rm H}$. Moreover, a mismatch between optical and X-ray absorption is common to most AGNs (Maiolino et al. 2001b).
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Copyright ESO 2005