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Using the Atacama Large Millimeter/sub-millimeter Array, we have detectedCO(3-2) line and far-infrared continuum emission from a galaxy associated witha high-metallicity ([M/H] = -0.27) damped Ly-alpha absorber (DLA) at z=2.19289. The galaxy is located 3.5" away from the quasar sightline,corresponding to a large impact parameter of 30 kpc at the DLA redshift. We usearchival Very Large Telescope-SINFONI data to detect Halpha emission from theassociated galaxy, and find that the object is dusty, with a dust-correctedstar formation rate of 110 +60 -30 Msun/yr. The galaxy's molecular mass islarge, Mmol = (1.4 +- 0.2) x 10^11 x (\alpha_CO/4.3) x (0.57/r_31) Msun,supporting the hypothesis that high-metallicity DLAs arise predominantly nearmassive galaxies. The excellent agreement in redshift between the CO(3-2) lineemission and low-ion metal absorption (~40 km/s) disfavors scenarios wherebythe gas probed by the DLA shows bulk motion around the galaxy. We use GiantMetrewave Radio Telescope HI 21cm absorption spectroscopy to find that the HIalong the DLA sightline must be warm, with a stringent lower limit on the spintemperature of T_s > 1895 x (f/0.93) K. The detection of CI absorption in theDLA, however, also indicates the presence of cold neutral gas. To reconcilethese results requires that the cold components in the DLA contribute little tothe HI column density, yet contain roughly 50% of the metals of the absorber,underlining the complex multi-phase nature of the gas surrounding high-zgalaxies.

Molecular Emission from a Galaxy Associated with a z~2.2 Damped Lyman-alpha Absorber