Star formation triggered by supernova explosions in young galaxies

Takanori Nagakura, Takashi Hosokawa, Kazuyuki Omukai

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We study the evolution of supernova remnants in a low-metallicity medium Z/Z = 10-4 to 10-2 in the early universe, using one-dimensional hydrodynamics with non-equilibrium chemistry. Once a post-shock layer is able to cool radiatively, a dense shell forms behind the shock. If this shell becomes gravitationally unstable and fragments into pieces, next-generation stars are expected to form from these fragments. To explore the possibility of this triggered star formation, we apply a linear perturbation analysis of an expanding shell to our results and constrain the parameter range of ambient density, explosion energy and metallicity where fragmentation of the shell occurs. For the explosion energy of 1051 erg (1052 erg), the shell fragmentation occurs for ambient densities higher than ≳102 cm-3 (10 cm-3), respectively. This condition depends little on the metallicity in the ranges we examined. We find that the mode of star formation triggered occurs only in massive (≳10 8 M) haloes.

Original languageEnglish
Pages (from-to)2183-2194
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume399
Issue number4
DOIs
Publication statusPublished - 2009 Nov
Externally publishedYes

Keywords

  • Cosmology: theory
  • Galaxies
  • Galaxies: formation
  • High-redshift
  • Shock waves
  • Stars: formation
  • Supernova remnants

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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