The role of dust in the early universe: The nature of cosmological reionization sources

Daisuke Yamasawa, Asao Habe, Kazuyuki Omukai, Takashi Kozasa, Takaya Nozawa, Hiroyuki Hirashita

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


We construct a semi-analytical model which includes a novel implementation of dust size evolution and the resulting H2 formation on dust grains in the early universe. We investigate the cosmic star formation rate and the reionization history, taking into acount the initial mass function transition from Pop III to Pop II stars due to dust cooling. We derive the star formation efficiencies for various host dark matter halo masses and discuss effects of the value of critical dust-to-gas mass ratio, script Dcr, on the reionization history. We conclude that the reionization completes before z = 6 in the case of the fiducail value script Dcr=7.4×10 -8.

Original languageEnglish
Title of host publicationFirst Stars IV - From Hayashi to the Future -
Number of pages3
Publication statusPublished - 2012
Externally publishedYes
Event1st Stars IV: From Hayashi to the Future - Kyoto, Japan
Duration: 2012 May 212012 May 25

Publication series

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


Other1st Stars IV: From Hayashi to the Future


  • dust, extinction
  • galaxies: ISM
  • galaxies: evolution
  • reionization

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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