Massive outflows driven by magnetic effects in star-forming clouds with high mass accretion rates Article Swipe
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· 2017
· Open Access
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· DOI: https://doi.org/10.1093/mnras/stx893
· OA: W2686476852
The relation between the mass accretion rate onto the circumstellar disc and\nthe rate of mass ejection by magnetically driven winds is investigated using\nthree-dimensional magnetohydrodynamics simulations. Using a spherical cloud\ncore with a varying ratio of thermal to gravitational energy, which determines\nthe mass accretion rate onto the disc, to define the initial conditions, the\noutflow propagation for approximately 10^4 yr after protostar formation is then\ncalculated for several cloud cores. The mass ejection rate and accretion rate\nare comparable only when the magnetic energy of the initial cloud core is\ncomparable to the gravitational energy. Consequently, in strongly magnetised\nclouds a higher mass accretion rate naturally produces both massive protostars\nand massive outflows. The simulated outflow mass, momentum, kinetic energy and\nmomentum flux agree well with observations, indicating that massive stars form\nthrough the same mechanism as low-mass stars but require a significantly strong\nmagnetic field to launch massive outflows.\n
