Treatment of ionizing radiation in Smoothed Particle Hydrodynamics calculations and application to the dynamics of cloud cores in the radiation field of massive stars.

Details Treatment of ionizing radiation in Smoothed Particle Hydrodynamics calculations and application to the dynamics of cloud cores in the radiation field of massive stars. Treatment of ionizing radiation in Smoothed Particle Hydrodynamics calculations and application to the dynamics of cloud cores in the radiation field of massive stars.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999tirs.book.....k&link_type=abstract

Treatment of ionizing radiation in Smoothed Particle Hydrodynamics calculations and application to the dynamics of cloud cores i

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Recent observations of broadened spectral lines suggest that the dynamics of molecular clouds (MCs) are dominated by supersonic, turbulent motion. Furthermore, one observes sheet-like and filamentary structures on all resolvable scales. There exists recent theoretical work concerning the evolution of turbulent MC's and their fragmentation into dense cloud cores, which are presumably the progenitors of new stars. These calculations allowed to study the dynamics in MCs under the influence of thermal pressure and self-gravity. This work focused on the development of a new computational method which allows the inclusion of ionizing radiation in hydrodynamical simulations using Smoothed Particle Hydrodynamics (SPH). In contrast to grid-based methods, SPH is especially suited for investigating the fragmentation of turbulent media due to the independence from a fixed grid geometry. The implementation of ionizing radiation into SPH is an important step toward the ability to model numerically the feedback of young stars on their molecular clouds. The first application is the ionization-driven implosion of density enhancements in MC's.

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