The imprint of pop III stars on the first galaxies

John H. Wise, Tom Abel, Matthew J. Turk, Michael L. Norman, Britton D. Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Here we present three adaptive mesh refinement radiation hydrodynamics simulations that illustrate the impact of momentum transfer from ionising radiation to the absorbing gas on star formation in high-redshift dwarf galaxies. Momentum transfer is calculated by solving the radiative transfer equation with a ray tracing algorithm that is adaptive in spatial and angular coordinates. We find that momentum input partially affects star formation by increasing the turbulent support to a three-dimensional rms velocity equal to the circular velocity of early haloes. Compared to a calculation that neglects radiation pressure, the star formation rate is decreased by a factor of five to 1.8 × 10-2 M yr-1 in a dwarf galaxy with a dark matter and stellar mass of 2.0 × 108 M and 4.5 × 105 M, respectively, when radiation pressure is included. Its mean metallicity of 10-2.1 Z is consistent with the observed dwarf galaxy luminosity-metallicity relation. In addition to photo-heating in H II regions, radiation pressure further drives dense gas from star forming regions, so supernovae feedback occurs in a warmer and more diffuse medium, launching metal-rich outflows.

Original languageEnglish (US)
Title of host publicationFirst Stars IV - From Hayashi to the Future -
Number of pages6
StatePublished - 2012
Externally publishedYes
Event1st Stars IV: From Hayashi to the Future - Kyoto, Japan
Duration: May 21 2012May 25 2012

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other1st Stars IV: From Hayashi to the Future


  • cosmology
  • hydrodynamics
  • radiative transfer
  • star formation

ASJC Scopus subject areas

  • General Physics and Astronomy


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