Evolution of magnetic fields in collapsing star-forming clouds under different environments

Koki Higuchi, Masahiro N. MacHida, Hajime Susa

研究成果: ジャーナルへの寄稿学術誌査読

9 被引用数 (Scopus)


In nearby star-forming clouds, amplification and dissipation of the magnetic field are known to play crucial roles in the star-formation process. The star-forming environment varies from place to place and era to era in galaxies. In this study, amplification and dissipation of magnetic fields in star-forming clouds are investigated under different environments using magnetohydrodynamics (MHD) simulations. We consider various star-forming environments in combination with the metallicity and the ionization strength, and prepare prestellar clouds having two different mass-to-flux ratios. We calculate the cloud collapse until protostar formation using ideal and non-ideal (inclusion and exclusion of ohmic dissipation and ambipolar diffusion) MHD calculations to investigate the evolution of the magnetic field. We perform 288 runs in total and show the diversity of the density range within which the magnetic field effectively dissipates, depending on the environment. In addition, the dominant dissipation process (Ohmic dissipation or ambipolar diffusion) is shown to strongly depend on the star-forming environment. Especially, for the primordial case, magnetic field rarely dissipates without ionization source, while it efficiently dissipates when very weak ionization sources exist in the surrounding environment. The results of this study help to clarify star formation in various environments.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータス出版済み - 4月 1 2018

!!!All Science Journal Classification (ASJC) codes

  • 天文学と天体物理学
  • 宇宙惑星科学


「Evolution of magnetic fields in collapsing star-forming clouds under different environments」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。