Massive outflows driven by magnetic effects in star-forming clouds with high mass accretion rates

Yuko Matsushita, Masahiro N. Machida, Yuya Sakurai, Takashi Hosokawa

研究成果: Contribution to journalArticle査読

29 被引用数 (Scopus)

抄録

The relation between the mass accretion rate on to the circumstellar disc and the rate of mass ejection by magnetically driven winds is investigated using three-dimensional magnetohydrodynamics simulations. Using a spherical cloud core with a varying ratio of thermal to gravitational energy, which determines the mass accretion rate on to the disc, to define the initial conditions, the outflow propagation for approximately 104 yr after protostar formation is then calculated for several cloud cores. The mass ejection rate and accretion rate are comparable only when the magnetic energy of the initial cloud core is comparable to the gravitational energy. Consequently, in strongly magnetized clouds a higher mass accretion rate naturally produces bothmassive protostars and massive outflows. The simulated outflowmass, momentum, kinetic energy and momentum flux agree well with observations, indicating that massive stars form through the same mechanism as low-mass stars but require a significantly strong magnetic field to launch massive outflows.

本文言語英語
ページ(範囲)1026-1049
ページ数24
ジャーナルMonthly Notices of the Royal Astronomical Society
470
1
DOI
出版ステータス出版済み - 9 1 2017

All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 宇宙惑星科学

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