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We obtained near-infrared spectra of 26 SDSS quasars at $0.7<z<2.5$ withreported rest-frame ultraviolet $M_{\rm BH} \sim 10^{10}M_{\odot}$ tocritically examine the systematic effects involved with their mass estimations.We find that AGNs heavier than $10^{10}M_{\odot}$ often display double-peakedH$\alpha$ emission, extremely broad FeII complex emission around MgII, andhighly blueshifted and broadened CIV emission. The weight of this evidence,combined with previous studies, cautions against the use of $M_{\rm BH}$ valuesbased on any emission line with a width over 8000 km/s. Also, the $M_{\rm BH}$estimations are not positively biased along the presence of ionized narrow lineoutflows, anisotropic radiation, or the use of line FWHM instead of $\sigma$for our sample, and unbiased with variability, scatter in broad line equivalentwidth, or obscuration for general type-1 quasars. Removing the systematicallyuncertain $M_{\rm BH}$ values, $\sim10^{10}M_{\odot}$ BHs in $1\lesssim z\lesssim 2$ AGNs can still be explained by anisotropic motion of the broad lineregion from $\sim10^{9.5}M_{\odot}$ BHs, although current observations supportthey are intrinsically most massive, and overmassive to the host's bulge mass.

The Most Massive Active Galactic Nuclei at $1\lesssim z \lesssim 2$