Phases and Processes in The ISM

Details Phases and Processes in The ISM Phases and Processes in The ISM

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sfet.confe...7e&link_type=abstract

"Star Formation in the Era of Three Great Observatories, meeting abstracts from the conference held July 13-15, 2005 in Cambridg

Physics

Scientific paper

Observations with the three Great Observatories reveal the intricacy of the phase structure of the ISM. Galaxy-scale maps of molecules, atoms, and dust, all with a wide range of temperatures, suggest heat sources primarily from starlight, supersonic expansions, and cosmic rays. ISM motions have similar energy sources, in addition to self-gravity and galactic scale processes like shear, spiral waves, and interactions. The structure of the ISM is mostly determined by the motions, and is therefore a superposition of cavities and shells from the expansions, along with spiral and globular clouds from a combination of shear, self-gravity, and spiral arm shocks. There is also a pervasive fractal hierarchy of cloudy structure from supersonic turbulence wherever the more directed forces are not dominant. The connections between these ISM phases and star formation will be discussed.

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