Three-dimensional simulations of molecular cloud fragmentation regulated by magnetic fields and ambipolar diffusion

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dc.creatorKudoh, Takahiro
dc.creatorBasu, Shantanu
dc.creatorOgata, Youichi
dc.creatorYabe, Takashi
dc.date2007-06-19
dc.date.accessioned2026-07-07T11:41:18Z
dc.date.available2026-07-07T11:41:18Z
dc.descriptionWe employ the first fully three-dimensional simulation to study the role of magnetic fields and ion-neutral friction in regulating gravitationally-driven fragmentation of molecular clouds. The cores in an initially subcritical cloud develop gradually over an ambipolar diffusion time while the cores in an initially supercritical cloud develop in a dynamical time. The infall speeds on to cores are subsonic in the case of an initially subcritical cloud, while an extended (\ga 0.1 pc) region of supersonic infall exists in the case of an initially supercritical cloud. These results are consistent with previous two-dimensional simulations. We also found that a snapshot of the relation between density (rho) and the strength of the magnetic field (B) at different spatial points of the cloud coincides with the evolutionary track of an individual core. When the density becomes large, both relations tend to B \propto ρ^{0.5}.
dc.description8 pages, 11 figures, accepted for publication in MNRAS, a preprint with fine figures at http://yso.mtk.nao.ac.jp/~kudoh/publist_e.html
dc.identifierhttps://arxiv.org/abs/0706.2696
dc.identifierhttp://arxiv.org/abs/0706.2696
dc.identifierMon.Not.Roy.Astron.Soc.380:499-505,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.12119.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200489
dc.subjectAstrophysics
dc.titleThree-dimensional simulations of molecular cloud fragmentation regulated by magnetic fields and ambipolar diffusion
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