ALMA detects a radial disk wind in DG Tau

29 Oct 2018  ·  Guedel M. U. Vienna, Eibensteiner C. U. Vienna, Dionatos O. U. Vienna, Audard M. U. Geneva, Forbrich J. U. Hertfordshire, Kraus S. U. Exeter, Rab Ch. U. Groningen, Schneider Ch. U. Hamburg, Skinner S. U. Colorado, Vorobyov E. U. Vienna ·

Aims: We aim to use the high spatial resolution of the Atacama Large Millimeter/submillimeter Array (ALMA) to map the flow pattern of molecular gas near DG Tau and its disk, a young stellar object driving a jet and a molecular outflow. Methods: We use observations from ALMA in the J = 2 - 1 transition of 12CO, 13CO, and C18O to study the Keplerian disk of DG Tau and outflows that may be related to the disk and the jet... Results: We find a new wind component flowing radially at a steep angle (~25 deg from the vertical) above the disk with a velocity of ~ 3.1 km/s. It continues the trend of decreasing velocity for increasing distance from the jet axis ("onion-like velocity structure"). Conclusions: The new component is located close to the protostellar disk surface and may be related to photoevaporative winds. read more

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Solar and Stellar Astrophysics Astrophysics of Galaxies