Spectral Mapping of W49A

Details Spectral Mapping of W49A Spectral Mapping of W49A

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40051b&link_type=abstract

Spitzer Proposal ID #40051

Physics

Scientific paper

We propose to spectrally map the massive Galactic HII region W49A with Spitzer-IRS in low-resolution mode. W49A is one of the most luminous and prolific massive star formation regions in the disk of the Milky Way. W49A is unique among massive Galactic star forming regions in that it contains about 40 separate ultra-compact HII regions and several massive, evolved OB clusters, embedded in 10E6 solar masses of molecular gas -- all located within a region of about 55pc. Our previous IRAC observations have shown that these components are closely related. Here we propose to complete our 5-15um spectral map of the central part of W49A to study the dynamics, physics and chemistry in the core of a luminous starburst region at reasonably high spatial resolution. The results will be of great importance to study the formation of massive stars and their interplay with the surrounding ISM. Previous GTO observations have demonstrated the technical feasibility of this project but unfortunately missed (due to scheduling reasons) the most relevant part of the region.

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