Speaker
Mr
Sebastian Körtgen
Description
Authors: Bastian Körtgen, Daniel Seifried, and Robi Banerjee
Affil: Hamburger Sternwarte, University of Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Molecular clouds represent the birthplaces of stars. Their study is therefore essential to understand the formation of stars. In this study, we present two sets of simulations to analyse the formation and evolution of molecular clouds by colliding streams of the WNM. In one project we started to investigate the question of how molecular clouds form and evolve under non-ideal conditions, i.e. when one flow is tilted with respect to the local magnetic field. We study the influence of different tilting angles on the phase transition to the CNM, the global structure and on the process of star formation. We show that star formation is delayed and that the formed clouds' mass greatly decreases with increasing obliquity. Additionally, we determine the impact of supernova feedback on the dynamics and structure of molecular clouds in case of head-on colliding WNM streams. We find that supernovae are indeed able to destroy entire molecular cloud complexes and redistribute the dense gas mass over the entire ISM. The emergence of multiple supernovae create bubbles of hot material, thus feeding the warm to hot gas phase of the multiphase ISM. Furthermore, we found that the SFE changes only slightly (a factor of a few) in the presence of SN feedback compared to the non-feedback cases.