PKS B1718-649 ALMA observations

These observations reveal that the carbon monoxide in the innermost 15 kpc of the galaxy is distributed in a complex warped disk. In the outer parts of this disk, the CO gas follows the rotation of the dust lane and of the stellar body of the galaxy hosting the radio source.

In the innermost kiloparsec, the gas abruptly changes orientation and forms a circumnuclear disk (r<~700pc) with its major axis perpendicular to that of the outer disk. Against the compact radio emission of PKS B1718-649 (r~2pc), we detect an absorption line at red-shifted velocities with respect to the systemic velocity ({Delta}v=+365+/-22km/s). This absorbing CO gas could trace molecular clouds falling onto the central super-massive black hole.