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Infrared quasi-stellar objects (IR QSOs) are a rare subpopulation selectedfrom ultraluminous infrared galaxies (ULIRGs) and have been regarded aspromising candidates of ULIRG-to-optical QSO transition objects. Here wepresent NOEMA observations of the CO(1-0) line and 3 mm continuum emission inan IR QSO IRAS F07599+6508 at $z=0.1486$, which has many properties in commonwith Mrk 231. The CO emission is found to be resolved with a major axis of$\sim$6.1 kpc that is larger than the size of $\sim$4.0 kpc derived for 3 mmcontinuum. We identify two faint CO features located at a projected distance of$\sim$11.4 and 19.1 kpc from the galaxy nucleus, respectively, both of whichare found to have counterparts in the optical and radio bands and may have amerger origin. A systematic velocity gradient is found in the CO maincomponent, suggesting that the bulk of molecular gas is likely rotationallysupported. Based on the radio-to-millimeter spectral energy distribution and IRdata, we estimate that about 30$\%$ of the flux at 3 mm arises from free-freeemission and infer a free-free-derived star formation rate of 77 $M_\odot\ {\rmyr^{-1}}$, close to the IR estimate corrected for the AGN contribution. We finda high-velocity CO emission feature at the velocity range of about -1300 to-2000 km s$^{-1}$. Additional deep CO observations are needed to confirm thepresence of a possible very high-velocity CO extension of the OH outflow inthis IR QSO.

Deep Observations of CO and Free-Free Emission in Ultraluminous Infrared QSO IRAS F07599+6508