Constraint on intergalactic dust from thermal history of intergalactic medium

Akio K. Inoue, Hideyuki Kamaya

研究成果: Article査読

21 被引用数 (Scopus)


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.

ジャーナルMonthly Notices of the Royal Astronomical Society
出版ステータスPublished - 2003 5 21

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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