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We present HST and UKIRT spectra and images of the 2 kpc binary quasar LBQS0103-2753 (z=0.858). The HST images (V- and I-band) show tidal featuresdemonstrating that this system is a major galaxy merger in progress. Atwo-color composite image brings out knots of star formation along the tidalarc and elsewhere. The infrared spectrum shows that both objects are at thesame redshift, and that the discrepant redshift of C IV in component A is aconsequence of the BAL absorption in the spectrum of this component. LBQS0103-2753 is one of the most closely spaced binary QSOs known, and is one ofrelatively few dual AGN showing confirmed broad emission lines from bothcomponents. While statistical studies of binary QSOs suggest that simultaneousfueling of both black holes during a merger may be relatively rare, LBQS0103-2753 demonstrates that such fueling can occur at high luminosity at a latestage in the merger at nuclear spacing of only a few kpc, without severeobscuration of the nuclei.

LBQS 0103-2753: A Binary Quasar in a Major Merger