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Title:Radiation-MHD Simulations of Pillars and Globules in HII Regions
Authors:Mackey, J., 2011
Abstract: Implicit and explicit raytracing-photoionisation algorithms have been implemented in the author's radiation-magnetohydrodynamics code. The algorithms are described briefly and their efficiency and parallel scaling are investigated. The implicit algorithm is more efficient for calculations where ionisation fronts have very supersonic velocities, and the explicit algorithm is favoured in the opposite limit because of its better parallel scaling. The implicit method is used to investigate the effects of initially uniform magnetic fields on the formation and evolution of dense pillars and cometary globules at the boundaries of HII regions. It is shown that for weak and medium field strengths an initially perpendicular field is swept into alignment with the pillar during its dynamical evolution, matching magnetic field observations of the ‘Pillars of Creation’ in M16. A strong perpendicular magnetic field remains in its initial configuration and also confines the photoevaporation flow into a bar-shaped, dense, ionised ribbon which partially shields the ionisation front.
ICHEC Project:Numerical Studies of the Evolution of Structures in H II Regions.
Publication:Numerical modeling of space plasma flows (astronum 2011). Proceedings of a 6th internation conference held at Velancia, Spain June 13-17, 2011. ASP Conference Series, Vol. 459. San Francisco: Astronomical Society of the Pacific, 2012., p.106
URL: http://adsabs.harvard.edu/abs/2012ASPC..459..106M
Keywords: photoionisation algorithms,parallel, HII, Radiation-MHD Simulations, Pillars and Globules
Status: Published

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