The escape fraction of ionizing photons from galaxies at z = 0-6

Akio K. Inoue, Ikuru Iwata, Jean Michel Deharveng

Research output: Contribution to journalLetter

97 Citations (Scopus)

Abstract

The escape fraction of ionizing photons from galaxies is a crucial quantity controlling the cosmic ionizing background radiation and the reionization. Various estimates of this parameter can be obtained in the redshift range z = 0-6, either from direct observations or from the observed ionizing background intensities. We compare them homogeneously in terms of the observed flux density ratio of ionizing (~900 Å rest-frame) to non-ionizing ultraviolet (~1500 Å rest-frame) corrected for the intergalactic absorption. The escape fraction is found to increase by an order of magnitude, from a value less than 0.01 at z ≲1 to about 0.1 at z ≳ 4.

Original languageEnglish
Pages (from-to)L1-L5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume371
Issue number1
DOIs
Publication statusPublished - 2006 Sep
Externally publishedYes

Keywords

  • Cosmology: observations
  • Diffuse radiation
  • Galaxies: evolution
  • Intergalactic medium

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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