Amplification of Turbulence in Contracting Prestellar Cores in Primordial Minihalos

Sho Higashi, Hajime Susa, Gen Chiaki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We investigate the amplification of turbulence through gravitational contraction of the primordial gas in minihalos. We perform numerical simulations to follow the cloud collapse, assuming polytropic equations of state for different initial turbulent Mach numbers and resolutions. We find that the turbulent velocity is amplified solely by gravitational contraction, and eventually becomes comparable to the sound speed, even for small initial turbulent Mach numbers (M ≳ 0.05). We derive an analytic formula for the amplification of turbulent velocity in a collapsing cloud, and find that our numerical results are consistent with the formula. These results suggest that the turbulence can play an important role in collapsing clouds for general cases.

Original languageEnglish
Article number107
JournalAstrophysical Journal
Volume915
Issue number2
DOIs
Publication statusPublished - 2021 Jul 10

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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