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Session 108 - HII Regions.
Display session, Thursday, January 18
North Banquet Hall, Convention Center
30 Doradus in the Large Magellanic Cloud is the nearest archetypical giant HII region. The HST WFPC2 images of the core of 30 Doradus have revealed not only the dense cluster R136 but also bright nebulosities with a variety of morphological and spectral characteristics. To understand these physical properties and to determine the three-dimensional geometry of the ionized gas, we have mapped the kinematic structure of a 3'x1' area at the core of 30 Dor with the echelle spectrograph on the 4m telescope at CTIO. The dataset consists of 21 3'-long echellograms at 3'' spacings; the mapping starts at R136 and ends at 1' south of R136. We have constructed a data cube, and extracted iso-velocity maps. These data allow us to identify expanding shells, (2) distinguish foreground/background clouds, (3) compare the distributions of kinematic features and stars, and (4) confirm kinematically the shocks at the [S II]-enhanced filaments. >From the iso-velocity maps, we have detected ring structures that cannot be recognized easily in direct images and hence have not been reported previously. In this poster we will report the RA-Dec-velocity data cube for the core of 30 Dor and present a model of its three-dimensional geometry. A video of the data cube will be shown.
Program listing for Thursday