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We report the results of a Sloan Digital Sky Survey-IV eBOSS program totarget X-ray sources and mid-infrared-selected WISE AGN candidates in a 36.8deg$^2$ region of Stripe 82. About half this survey (15.6 deg$^2$) covers thelargest contiguous portion of the Stripe 82 X-ray survey. This programrepresents the largest spectroscopic survey of AGN candidates selected solelyby their WISE colors. We combine this sample with X-ray and WISE AGN in thefield identified via other sources of spectroscopy, producing a catalog of 4847sources that is 82% complete to $r\sim22$. Based on X-ray luminosities or WISEcolors, 4730 of these sources are AGN, with a median sample redshift of$z\sim1$. About 30% of the AGN are optically obscured (i.e., lack broad linesin their optical spectra). BPT analysis, however, indicates that 50% of theWISE AGN at $z<0.5$ have emission line ratios consistent with star-forminggalaxies, so whether they are buried AGN or star-forming galaxy contaminants iscurrently unclear. We find that 61% of X-ray AGN are not selected as MIR AGN,with 22% of X-ray AGN undetected by WISE. Most of these latter AGN have highX-ray luminosities ($L_{\rm x} > 10^{44}$ erg s$^{-1}$), indicating that MIRselection misses a sizable fraction of the highest luminosity AGN, as well aslower luminosity sources where AGN heated dust is not dominating the MIRemission. Conversely, $\sim$58% of WISE AGN are undetected by X-rays, though wedo not find that they are preferentially redder than the X-ray detected WISEAGN.

astrophysical journal/the astrophysical journal

SDSS-IV eBOSS Spectroscopy of X-ray and WISE AGN in Stripe 82X: Overview  of the Demographics of X-ray and Mid-Infrared Selected Active Galactic Nuclei