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Feedback in the form of mass outflows driven by star formation or activegalactic nuclei is a key component of galaxy evolution. The luminous infraredgalaxy Zw 049.057 harbours a compact obscured nucleus with a possible far-IRsignature of outflowing molecular gas. Due to the high optical depths at far-IRwavelengths, the interpretation of the outflow signature is uncertain. At mmand radio wavelengths, the radiation is better able to penetrate the largecolumns of gas and dust. We used high resolution observations from the SMA,ALMA, and the VLA to image the CO 2-1 and 6-5 emission, the 690 GHz continuum,the radio cm continuum, and absorptions by rotationally excited OH. The CO lineprofiles exhibit wings extending 300 km/s beyond the systemic velocity. At cmwavelengths, we find a compact (40 pc) continuum component in the nucleus, withweaker emission extending several 100 pc approximately along the major andminor axes of the galaxy. In the OH absorption lines toward the compactcontinuum, wings extending to a similar velocity as for the CO are seen on theblue side of the profile. The weak cm continuum emission along the minor axisis aligned with a highly collimated, jet-like dust feature previously seen innear-IR images of the galaxy. Comparison of the apparent optical depths in theOH lines indicate that the excitation conditions in Zw 049.057 differ fromthose in other OH megamaser galaxies. We interpret the wings in the spectrallines as signatures of a molecular outflow. A relation between this outflow andthe minor axis radio feature is possible, although further studies are requiredto investigate this possible association and understand the connection betweenthe outflow and the nuclear activity. Finally, we suggest that the differing OHexcitation conditions are further evidence that Zw 049.057 is in a transitionphase between megamaser and kilomaser activity.

A hidden molecular outflow in the LIRG Zw 049.057