An observational link between AGN Eddington ratio and [NII]{lambda}6583/Ha at 0.6<z<1.7. (arXiv:1906.04179v1 [astro-ph.GA])

An observational link between AGN Eddington ratio and [NII]{lambda}6583/Ha at 0.6We 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 ( = 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.

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.

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