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We find that the Fe III$\lambda\lambda$2039-2113 spectral feature in quasarsappears systematically redshifted by amounts accountable under the hypothesisof gravitational redshift induced by the central supermassive black hole. Ouranalysis of 27 composite spectra from the BOSS survey indicates that theredshift and the broadening of the lines in the Fe III$\lambda\lambda$2039-2113blend roughly follow the expected correlation in the weak limit ofSchwarzschild geometry for virialized kinematics. Assuming that the Fe III UVredshift provides a measure of $M_{BH}\over R$ (${\Delta \lambda\over\lambda}\simeq{3\over2}{G\over c^2} {M_{BH}\over R}$) and using differentestimates of the emitting region size, $R$ (either from gravitationalmicrolensing, reverberation mapping or from the scaling of size with intrinsicquasar luminosity), we obtain masses for 10 objects which are in agreementwithin uncertainties with previous mass estimates based on the virial theorem.Reverberation mapping estimates of the size of the FeIII$\lambda\lambda$2039-2113 emitting region in a sample of objects would beneeded to confirm the gravitational origin of the measured redshifts.Meanwhile, we present a tentative black hole mass scaling relationship based onthe Fe III$\lambda\lambda$2039-2113 redshift useful to measure the black holemass of one individual object from a single spectrum.

Systematic Redshift of the Fe III UV Lines in Quasars. Measuring Supermassive Black Hole Masses under the Gravitational Redshift Hypothesis