RSAA Colloquia / Seminars / Feast-of-Facts: Tuesday, 01 December 2015, 11:00-12:00; Woolley Seminar Room (NOTE CHANGE OF LOCATION!)

Wladimir Banda-Barragan

"Magnetohydrodynamics of Wind-Cloud Interactions: Filament Formation in the Interstellar Medium"

Filamentary structures are ubiquitous in the interstellar medium, yet their formation, internal structure and longevity have not been studied in detail. In this talk I present a summary of my PhD thesis, which investigates the characteristics, formation and dynamics of filaments arising from wind-cloud interactions. I use magnetohydrodynamic numerical simulations with gas multi-tracking techniques to shed light on the physical mechanisms acting upon wind-swept clouds and provide measurements of the aspect ratios, internal velocity dispersions, energy densities, and magnetic field strengths and orientations in the resulting filaments. Using state-of-the-art visualisation techniques, I also explain the roles of plasma instabilities, turbulence and magnetic dynamos in the evolution of filaments. At the end of the talk I discuss the relevance of this work for the study of clouds and filaments in the Galactic centre region and provide my perspectives of potential future research in this field.