Infall and outflow detections in a massive core JCMT 18354-0649S

Abstract

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 CH3OH (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 2.0 × 10-3 M⊙ yr-1. 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 -1. Analysis shows that the N-bearing molecules especially HCN can trace both inflow and outflow. © 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A.