Statistics – Computation
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........18k&link_type=abstract
PhD Thesis, Max-Planck-Institut für Astronomie, Heidelberg, Germany, 1999.
Statistics
Computation
1
Scientific paper
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 calcualtions allowed to study the dynamics in MCs under the influence of thermal pressure and self-gravity. However, in high mass SF regions, the massive stars start interacting with their parental cloud via stellar winds and ionizing radiation. These feedback processes disrupt the MC by heating and ionization, but could at the same time induce new star formation by compression of the MC. 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. http://www.mpia-hd.mpg.de/THEORY/preprints/kessel/1999/dissertation/head.html
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