The evolution of giant molecular filaments

摘要: In recent years, there has been a growing interest in studying giant molecular filaments (GMFs), which are extremely elongated (>100 pc length) clouds (GMCs). They often seen as inter-arm features external spiral galaxies, but have tentatively associated with arms when viewed the Milky Way. this paper, we study time evolution of GMFs high-resolution section galaxy simulation, and their link arm GMCs star formation, over period 11 Myr. The generally survive passage, although they subject to number processes (e.g. stellar feedback differential rotation) that can break filamentary structure into smaller sections. not gravitationally bound whole, are, some extent, confined by pressure. Once reach arms, tend evolve more substructured GMCs, suggesting may be precursors GMCs. Here, become incorporated complex almost continuum medium makes up gaseous arm. Instead retaining clear shape, shapes distorted both climbing potential interaction gas within do aligned just before enter them (when minimum potential), could account for observations