Constraint on intergalactic dust from thermal history of intergalactic medium

Akio K. Inoue, Hideyuki Kamaya

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

This letter investigates the amount of dust in the intergalactic medium (IGM). The dust photoelectric heating can be the most efficient heating mechanism in the IGM where the density is very small and there are a lot of hard ultraviolet photons. Comparing the observational thermal history of IGM with a theoretical one taking into account the dust photoelectric heating, we can put an upper limit on the dust-to-gas ratio, D, in the IGM. As the rate of the dust photoelectric heating depends on the size of dust, we find the following results: if the grain size is ≳ 100 Å, D at z ∼ 3 is ≲ 1/100 Galactic value corresponding to Ωdust IGM ≲10-5. On the other hand, if the grain size is as small as ∼ 10 Å, D is ≲1/1000 Galactic value corresponding to ΩdustIGM ≲ 10-6.

Original languageEnglish
Pages (from-to)L7-L11
JournalMonthly Notices of the Royal Astronomical Society
Volume341
Issue number3
DOIs
Publication statusPublished - 2003 May 21
Externally publishedYes

Keywords

  • Cosmology: Theory
  • Dust, extinction
  • Intergalactic medium
  • Quasars: Absorption lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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