The stellar, molecular gas, and dust content of the host galaxies of two z ～ 2.8 dust-obscured quasars

摘要

We present optical through radio observations of the host galaxies of two dust-obscured, luminous quasars selected in the mid-infrared, at z = 2.62 and z = 2.99, including a search for CO emission. Our limits on the CO luminosities are consistent with these objects having masses of molecular gas ? 10 ~(10) M _⊙, several times less than those of luminous submillimeter-detected galaxies at comparable redshifts. Their near-infrared spectral energy distributions, however, imply that these galaxies have high stellar masses (10~(11)-10~(12) M _⊙). The relatively small reservoirs of molecular gas and low dust masses are consistent with them being relatively mature systems at high-z.