Dynamical evolution of substucture in molecular clouds

Details Dynamical evolution of substucture in molecular clouds Dynamical evolution of substucture in molecular clouds

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........6g&link_type=abstract

Ph.D. Thesis Texas Univ., Austin.

Physics

4

Clumps, Dynamic Models, Evolution (Development), Molecular Clouds, Morphology, Collisions, Compressing, Emission Spectra, Gravitational Effects, Hydrodynamics, Infrared Radiation, Rarefaction, Shock Heating, Shock Layers, Subsonic Speed, Supersonic Speed

Scientific paper

There is abundant and diverse evidence that clumping is a common feature of molecular clouds. These observations have motivated a dynamical model of molecular clouds which views them as an ensemble of interacting clumps of gas. The primitive forms of clump interaction were studied through the technique of hydrodynamical simulation. The simplest interaction is that of a single clump plowing through an ambient medium. Plowing clumps in both subsonic and supersonic regimes were studied with particular emphasis on the physics of shock compression and rarefaction, vorticity, and drag. The infrared emission spectra of the shock-heated gas associated with supersonic clumps was also calculated. It is found that an ensemble of clumps will emit radiation, primarily in clump wake, sufficient to be observable. The observation of this infrared radiation is proposed as a consistency test of clumpy models of molecular clouds. Gravitational instability and clump coalescence were studied in simulations of clump collisions. The thermal stability of molecular gas was also studied, and unstable condensation modes in secularly cooling gas were found. These modes damp before reaching nonlinearity, but provide a continual source of acoustic perturbation.

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