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Gaseous outflows are key phenomena in the evolution of galaxies, as theyaffect star formation (either positively or negatively), eject gas from thecore or disk, and directly cause mixing of pristine and processed material.Active outflows may be detected through searches for broad spectral lineemission or high-velocity gas, but it is also possible to determine thepresence of past outflows by searching for extended reservoirs of chemicallyenriched molecular gas in the circumgalactic medium (CGM) around galaxies. Inthis work, we examine the CO(3-2) emission of a set of seven z~2.0-2.5 AGN hostgalaxies, as observed with ALMA. Through a three-dimensional stacking analysiswe find evidence for extended CO emission of radius r~13kpc. We extend thisanalysis to the HST/ACS i-band images of the sample galaxies, finding a complexsmall-scale (r<10kpc) morphology but no robust evidence for extended emission.In addition, the dust emission (traced by rest-frame FIR emission) shows noevidence for significant spatial extension. This indicates that the diffuse COemission revealed by ALMA is morphologically distinct from the stellarcomponent, and thus traces an extended reservoir of enriched gas. The presenceof a diffuse, enriched molecular reservoir around this sample of AGN hostgalaxies at cosmic noon hints at a history of AGN-driven outflows that likelyhad strong effects on the star formation history of these objects.

Evidence for extended gaseous reservoirs around AGN at cosmic noon from ALMA CO(3-2) observations