2015ApJ...815..106H

We present the results of SiO (2 - 1) and SO₂() line observations of Sgr B2(N) made with the Atacama Large Millimeter/submillimeter Array at an angular resolution of ∼2". Our analysis of the SiO and SO₂ line emission reveals a bipolar molecular outflow in an east-west direction whose driving source is located at K2. In addition, the SO₂line core shows a north-south velocity gradient most probably indicating a hot core of molecular gas rotating around K2. Fractional abundances of SO₂and SiO (X(SO₂) and X(SiO), respectively) in the outflowing molecular gas are derived from comparisons with the C¹⁸O emission. Assuming an excitation temperature of 100±50 K, we calculate X(SO₂) =x10^–8 and X(SiO) =x10^–9. The outflow from Sgr B2(N) K2 is characterized as a young (5x10³ yr) and massive (∼2000) but moderately collimated (∼60°) outflow. We also report a possible detection of the SiO () maser emission from the position of K2. If confirmed, it would make Sgr B2(N) the fourth star-forming region associated with SiO masers.