Hot Expanding Shells in the Envelope of the Sagittarius B2 Molecular Cloud

Details Hot Expanding Shells in the Envelope of the Sagittarius B2 Molecular Cloud Hot Expanding Shells in the Envelope of the Sagittarius B2 Molecular Cloud

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..140m&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

4

Scientific paper

We present high resolution images of the warm gas in the molecular envelope of the Sagittarius B2 (Sgr B2) molecular cloud. These images reveal that the morphology of the Sgr B2 molecular envelope is dominated by several shells and incomplete shells expanding at low velocities ~10 kmsns. The sizes of the shells are between 1 and 2.6 pc and their thickness are between 0.2 and 0.4 pc. The shells are hot with kinetic temperatures, TK, of 40 -150 K. The large number of masers in H _2 CO, CH _3 OH and the newly detected (3,3) nht masers are correlated with the hot molecular shells. Associated with the shells, we have also detected new hot cores, suggesting that massive star formation has taken place very recently in the molecular envelope of Sgr B2. Wind-blown bubbles driven by typical galactic Wolf-Rayet stars could account for the kinetic energies and the momenta observed in the hot nht shells. The shocks associated with the expanding bubbles provide the particular chemistry required to explain the large number of masers, and the heating of the molecular gas in the envelope of Sgr B2.

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