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We present deep observations of the 12CO(1-0) and (3-2) lines in theultra-luminous infrared and radio galaxy 4C12.50, carried out with the 30mtelescope of the Institut de Radioastronomie Millimetrique. Our observationsreveal the cold molecular gas component of a warm molecular gas outflow thatwas previously known from Spitzer Space Telescope data. The 12CO(3-2) profileindicates the presence of absorption at -950 km/s from systemic velocity with acentral optical depth of 0.22. Its profile is similar to that of the HIabsorption that was seen in radio data of this source. A potential detection ofthe (0-1) absorption enabled us to place an upper limit of 0.03 on its centraloptical depth, and to constrain the excitation temperature of the outflowing COgas to >=65K assuming that the gas is thermalized. If the molecular cloudsfully obscure the background millimeter continuum that is emitted by the radiocore, the H2 column density is >=1.8*10^22 /cm^2. The outflow then carries anestimated cold H2 mass of at least 4.2*10^3 M_sun along the nuclear line ofsight. This mass will be even higher when integrated over several lines ofsight, but if it were to exceed 3*10^9 M_sun, the outflow would most likely beseen in emission. Since the ambient cold gas reservoir of 4C12.50 is 1.0*10^10M_sun, the outflowing-to-ambient mass ratio of the warm gas (37%) could beelevated with respect to that of the cold gas.

Cold and warm molecular gas in the outflow of 4C12.50