2011ApJ...728...91L

We present a high-resolution study of a massive dense core JCMT 18354-0649S with the Submillimeter Array. The core is mapped with continuum emission at 1.3 mm and molecular lines including CH₃ OH (5₂₃-4₁₃) and HCN (3-2). The dust core detected in the compact configuration has a mass of 47 M_☉ and a diameter of 2'' (0.06 pc), which is further resolved into three condensations with a total mass of 42 M_☉ under higher spatial resolution. The HCN (3-2) line exhibits an asymmetric profile consistent with infall signature. The infall rate is estimated to be 2.0x10^–3 M_☉/yr. The high-velocity HCN (3-2) line wings present an outflow with three lobes. Their total mass is 12 M_☉ and the total momentum is 121 M_☉km/s. Analysis shows that the N-bearing molecules especially HCN can trace both inflow and outflow.