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A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408

By Qizhou Zhang, T. K. Sridharan, Todd R. Hunter, Yuan Chen, Henrik Beuther and Friedrich Wyrowski

Abstract

Received...; accepted... Context. Studies of high-mass protostellar objects reveal important information regarding the formation process of massive stars. Aims. We study the physical conditions in the dense core and molecular outflow associated with the high-mass protostellar candidate IRAS 18566+0408 at high angular resolution. Methods. We performed interferometric observations in the NH3 (J,K)=(1,1), (2,2) and (3,3) inversion transitions, the SiO J=2-1 and HCN J=1-0 lines, and the 43 and 87 GHz continuum emission using the VLA and OVRO. Results. The 87 GHz continuum emission reveals two continuum peaks MM-1 and MM-2 along a molecular ridge. The dominant peak MM-1 coincides with a compact emission feature at 43 GHz, and arises mostly from the dust emission. For dust emissivity indexβof 1.3, the masses in the dust peaks amount to 70 M ⊙ for MM-1, and 27 M ⊙ for MM-2. Assuming internal heating, the centra

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