Accretion and Diffusion Timescales in Sheets and Filaments
Astrophysics of Galaxies
2015-06-19 v1
Abstract
A comparison of accretion and (turbulent) magnetic diffusion timescales for sheets and filaments demonstrates that dense star-forming clouds generally will -- under realistic conditions -- become supercritical due to mass accretion on timescales at least an order of magnitude shorter than ambipolar and/or turbulent diffusion timescales. Thus, ambipolar or turbulent diffusion -- while present -- is unlikely to control the formation of cores and stars.
Cite
@article{arxiv.1406.2191,
title = {Accretion and Diffusion Timescales in Sheets and Filaments},
author = {Fabian Heitsch and Lee Hartmann},
journal= {arXiv preprint arXiv:1406.2191},
year = {2015}
}
Comments
12 pages, 6 figures, accepted by MNRAS