Protostars and Planets VI, Heidelberg, July 15-20, 2013
Molecular Cloud Formation and ISM Phases in G333
Jones, Paul (University of New South Wales, Australia)
Cunningham, Maria (University of New South Wales, Australia)
The molecular interstellar medium (ISM) is often studied with CO observations as a proxy for molecular hydrogen H2. However, different molecules form from the atomic ISM under different conditions, and so there is molecular material not traced by CO. Another widespread molecule is hydroxyl, OH, so a three-way comparison of HI, OH and CO lines is expected to show molecular features in OH which are not traced by CO, but which highlight the transition from atomic (seen in the H I line) to molecular gas.
We present here observations, with the ATCA and Parkes, of the 4 lines of OH at 18 cm and the H I line at 21 cm, in the G333 molecular cloud complex. We combine these with existing 13CO data from the Mopra telescope.
This project is a pilot for the future Galactic plane survey (GASKAP) with ASKAP in H I and OH lines and complements the current SPLASH project to map OH lines in the southern Galactic Plane with the Parkes telescope.
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