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We report interferometric imaging of CO(J=3-2) emission toward the z=2.846submillimeter-selected galaxy SMM J04135+10277, using the Combined Array forResearch in Millimeter-wave Astronomy (CARMA). SMM J04135+10277 was previouslythought to be a gas-rich, submillimeter-selected quasar, with the highestmolecular gas mass among high-z quasars reported in the literature. Our maps at~6x improved linear resolution relative to earlier observations spatiallyresolve the emission on ~1.7" scales, corresponding to a (lensing-corrected)source radius of ~5.2 kpc. They also reveal that the molecular gas reservoir,and thus, likely the submillimeter emission, is not associated with the hostgalaxy of the quasar, but with an optically faint gas-rich galaxy at 5.2", or41.5 kpc projected distance from the active galactic nucleus (AGN). Theobscured gas-rich galaxy has a dynamical mass of M_dyn sin2(i)=5.6x10^11 M_sun,corresponding to a gas mass fraction of ~21%. Assuming a typical M_BH/M* ratiofor z>2 quasars, the two galaxies in this system have an approximate mass ratioof ~1.9. Our findings suggest that this quasar-starburst galaxy pair couldrepresent an early stage of a rare major, gas-rich/gas-poor ("wet-dry") mergerof two massive galaxies at z=2.8, rather than a single, gas-rich AGN hostgalaxy. Such systems could play an important role in the early buildup ofpresent-day massive galaxies through a submillimeter-luminous starburst phase,and may remain hidden in larger numbers among rest-frame far-infrared-selectedquasar samples at low and high redshift.

SMM J04135+10277: A Candidate Early-Stage "Wet-Dry" Merger of Two Massive Galaxies at z=2.8