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Red quasars are thought to be an intermediate population betweenmerger-driven star-forming galaxies in dust-enshrouded phase and normalquasars. If so, they are expected to have high accretion ratios, but theirintrinsic dust extinction hampers reliable determination of Eddington ratios.Here, we compare the accretion rates of 16 red quasars at $z \sim 0.7$ to thoseof normal type 1 quasars at the same redshift range. The red quasars areselected by their red colors in optical through near-infrared (NIR) and radiodetection. The accretion rates of the red quasars are derived from the P$\beta$line in NIR spectra, which is obtained by the SpeX on the Infrared TelescopeFacility (IRTF) in order to avoid the effects of dust extinction. We find thatthe measured Eddington ratios ($L_{\rm bol}$/$L_{\rm Edd} \simeq 0.69$) of redquasars are significantly higher than those of normal type 1 quasars, which isconsistent with a scenario in which red quasars are the intermediate populationand the black holes of red quasars grow very rapidly during such a stage.

Accretion Rates of Red Quasars from the Hydrogen P$\beta$ line