Interactions of the Cold and Hot ISM: Imaging the Nearest Molecular Clouds In the Local Bubble

Details Interactions of the Cold and Hot ISM: Imaging the Nearest Molecular Clouds In the Local Bubble Interactions of the Cold and Hot ISM: Imaging the Nearest Molecular Clouds In the Local Bubble

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50637r&link_type=abstract

Spitzer Proposal ID #50637

Mathematics

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Scientific paper

The absolute nearest molecular clouds reside within a million degree substrate known as the Local Bubble. Cold molecular gas is not typically found in isolation surrounded by hot material, but several other examples have been identified, particularly at the edges of shell structures formed by stellar winds and supernovae. These local molecular clouds located within the Local Bubble, provide a unique opportunity to study the interaction of cold and hot phases of the interstellar medium in detail. We propose a morphological study of MBM40, one the nearest molecular clouds at <80 pc, to test predictions of evaporative conduction and turbulent mixing layer theory. The morphology of these translucent clouds, measured with physical resolutions down to <100 AU due to their proximity, can be probed by 8 micron PAH emission and dust emission from the longest MIPS wavelengths (e.g., 24 and 160 microns). These observations will measure basic physical properties, such as dust opacity and temperature, as well as, gas column density. Constraints on evaporative timescales and magnetic field strengths can be estimated from the dimensions of the smallest observed size scales. In addition, these measurements may even provide limits on the physical characteristics of the hot gas itself. The proposed cloud (MBM40) is distinct from the more distant large molecular complexes because it is located within the hot Local Bubble cavity which defines the bounds of our local interstellar medium. These observations will be a unique contrasting sample to the well-observed, and more distant, traditional molecular clouds.

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