Different modes of star formation: Gravitational collapse of magnetically subcritical cloud

Masahiro N. Machida, Koki Higuchi, Satoshi Okuzumi

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)


Star formation in magnetically subcritical clouds is investigated using a three-dimensional non-ideal magnetohydrodynamic simulation. Since rapid cloud collapse is suppressed until the magnetic flux is sufficiently removed from the initially magnetically subcritical cloud by ambipolar diffusion, it takes ≳5-10 tff to form a protostar, where tff is the freefall time-scale of the initial cloud. The angular momentum of the star-forming cloud is efficiently transferred to the interstellar medium before the rapid collapse begins, and the collapsing cloud has a very low angular momentum. Unlike the magnetically supercritical case, no large-scale lowvelocity outflow appears in such a collapsing cloud due to the short lifetime of the first core. Following protostar formation, a very weak high-velocity jet, which has a small momentum and might disappear at a later time, is driven near the protostar, while the circumstellar disc does not grow during the early mass accretion phase. The results show that the star formation process in magnetically subcritical clouds is qualitatively different from that in magnetically supercritical clouds.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータス出版済み - 1 2018

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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