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 CH${}_3$OH ($5_{23}$-$4_{13}$) and HCN (3-2). The dust core detected in the compact configuration has a mass of $47M_{\odot }$ and a diameter of $2\arcsec$ (0.06 pc), which is further resolved into three condensations with a total mass of $42M_{\odot }$ under higher spatial resolution. The HCN (3-2) line exhibits asymmetric profile consistent with infall signature. The infall rate is estimated to be $2.0\times 10^{-3}{M}_{\odot }\cdot$yr${}^{-1}$. The high velocity HCN (3-2) line wings present an outflow with three lobes. Their total mass is $12M_{\odot }$ and total momentum is $121M_{\odot }\cdot$km s${}^{-1}$, respectively. Analysis shows that the N-bearing molecules especially HCN can trace both inflow and outflow.

21 pages, 7 figures

References in corpus (13)

• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• Multiple Jets from the High-Mass (Proto)stellar Cluster AFGL5142
• Forming an Early O-type Star Through Gas Accretion?
• Signatures of inflow motion in cores of massive star formation: Potential collapse candidates
• Probing Inward Motions in Starless Cores Using The HCN J = 1-0 Hyperfine Transitions : A Pointing Survey Toward Central Regions
• TMC-1C: an accreting starless core
• A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408
• A multi-transition molecular line study of inward motions towards massive star-forming cores
• Molecular line profiles as diagnostics of protostellar collapse: modelling the `blue asymmetry' in inside-out infall
• Outflow and Infall in a Sample of Massive Star Forming Regions II: Large Scale Kinematics
• Dichotomy in the Dynamical Status of Massive Cores in Orion
• Molecular Line Observations of the Small Protostellar Group L1251B
• Mid- and high-J CO observations towards UCHIIs

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