Characterization of the outflow of W28A2

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The formation of high mass stars is less well understood than that of lower mass stars due to the shorter time scales and larger distances involved. One of the earli­est stages of high mass star formation consists of a period of outflow which can be studied through its impact on its environment. We present observations of W28A2, a shell like Ultracompact HII region associated with one of the youngest and most energetic outflows in the Galaxy (05 star). Using the James Clerk Maxwell Tele­scope, we have observed the outflow in a number of transitions and have derived the age, mass, extent, and velocity of the outflow. In order to better constrain the driving mechanism of the outflow, we have conducted magneto-hydrodynamic simu­lations (using Zeus-MP and Jetget) of a high-velocity jet impacting on a surrounding molecular envelope.
Bibliography: p. 103-109
Some pages are in colour.
Klaassen, P. D. (2004). Characterization of the outflow of W28A2 (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from doi:10.11575/PRISM/12228