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We present CO(1--0) observations of the high-redshift quasar SDSSJ160705+533558 ($z=3.653$) using the Karl G. Jansky Very Large Array (VLA). Wedetect CO emission associated with the quasar and at $\sim16.8\,\rm kpc$projected distance from it, separated by $\sim800\,\rm km\,s^{-1}$ in velocity.The total molecular gas mass of this system is $\sim5\times10^{10}\,\rmM_{\odot}$. By comparing our CO detections with previous submillimetre (submm)observations of the source, an offset between the different emission componentsis revealed: the peak of the submm emission is offset from the quasar and fromthe CO companion detected in our VLA data. To explain our findings, we proposea scenario similar to that for the Antennae galaxies: SDSS J160705+533558 mightbe a merger system in which the quasar and the CO companion are the merginggalaxies, whose interaction resulted in the formation of a dusty, star-formingoverlap region between the galaxies that is dominant at the submm wavelengths.

VLA detects CO(1-0) emission in the z=3.65 quasar SDSS J160705+533558