An observational link between AGN Eddington ratio and
  [NII]{\lambda}6583/Ha at 0.6<z<1.7
  We present an observed relationship between Eddington ratio ({\lambda}Edd)
and optical narrow-emission-line ratio ([N II]{\lambda}6583/H{\alpha}) of
X-ray-selected broad-line active galactic nuclei (AGN) at 0.6 < z < 1.7. We use
27 near-infrared spectra from the Fiber Multi-Object Spectrograph along with 26
sources from the literature. We show that the {\lambda}Edd and [N
II]{\lambda}6583/H{\alpha} ratio at 0.6 < z < 1.7 exhibits a similar
anti-correlation distribution of {\lambda}Edd-[N II]{\lambda}6583/H{\alpha} as
has been found for local (<z> = 0.036), ultra-hard X-ray selected AGN. The
observed distribution implies that there is a consistent relationship from
local to z \sim 1.7 which corresponds from the present time to 4 Gyr old.
Further study of high redshift low Eddington ratio AGN (log{\lambda}Edd < -2)
is necessary to determine fully whether the {\lambda}Edd-[N
II]{\lambda}6583/H{\alpha} anti-correlation still holds in high-redshift AGN at
low Eddington ratios.
