2012A&A...540L..13X

We present Submillimeter Array observations of the young stellar object IRAS 04579+4703 in the 1.3mm continuum and in the ¹²CO (2-1), ¹³CO(2-1), and C¹⁸O(2-1) lines. The 1.3mm continuum image reveals a flattened structure with a mass of 13M_☉. The ¹²CO (2-1) line map and position-velocity diagram, together with the broad wing (full width = 30km/s) of the ¹²CO (2-1) line, clearly show that there is an outflow motion, which originates from an embedded massive YSO in this region. The lengths of the blue-shifted and red-shifted lobes are 0.14pc and 0.13pc, respectively. The total gas mass, average dynamical timescale, and mass entrainment rate of the outflow are 1.8M_☉, 1.7x10⁴yr and 1.1x10^–4M_☉/yr, respectively. The flattened morphology of the continuum source perpendicular to the outflow direction, and the velocity gradient seen in the spectra of C¹⁸O (2-1) taken from different locations along the major axis of the continuum source, suggest that there is an accretion disk in this region.