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We report the detection of a massive (M(gas) > 5x10^9 Msun) molecular/dustydisk of 1.4kpc-size fueling the central engine of the Compact Symmetric Object(CSO) 4C31.04 based on high-resolution (0.5''--1.2'') observations done withthe IRAM Plateau de Bure interferometer (PdBI). These observations allow forthe first time to detect and map the continuum emission from dust at 218GHz inthe disk of a CSO. The case for a massive disk is confirmed by the detection ofstrong HCO+(1--0) line emission and absorption. The molecular gas mass of4C31.04 is in the range 0.5x10^10--5x10^10Msun. While the distribution andkinematics of the gas correspond roughly to those of a rotating disk, we findevidence of distortions and non-circular motions suggesting that the disk isnot in a dynamically relaxed state. We discuss the implications of theseresults for the general understanding of the evolution of radio galaxies.

Fueling the central engine of radio galaxies. I. The molecular/dusty disk of 4C 31.04