Title : Characterizing the outflow in W28AZ
Authors : P. Klaassen, D. Blume, R. Ouyed, J. Di Francesco
Abstract :
The formation of high mass stars is less well understood than that of
lower mass stars due to the shorter timescales 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 (O6 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.