The contribution of the IGM and minihaloes to the 21-cm signal of reionization

Bin Yue, Benedetta Ciardi, Evan Scannapieco, Xuelei Chen

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We study the statistical properties of the cosmological 21-cm signal from both the intergalactic medium (IGM) and minihaloes, using a reionization simulation that includes a self-consistent treatment of minihalo photoevaporation. We consider two models for minihalo formation and three typical thermal states of the IGM - heating purely by ionization, heating from both ionizing and Lyα photons and a maximal 'strong heating' model. We find that the signal from the IGM is almost always dominant over that from minihaloes. In our calculation, the differential brightness temperature, δTb, of minihaloes is never larger than 2 mK. Although there are indeed some differences in the signals from the minihaloes and from the IGM, even with the planned generation of radio telescopes it will be unfeasible to detect them. However, minihaloes significantly affect the ionization state of the IGM and the corresponding 21-cm flux.

Original languageEnglish (US)
Pages (from-to)2122-2133
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume398
Issue number4
DOIs
StatePublished - Oct 2009

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intergalactic media
heating
ionization
brightness temperature
radio
radio telescopes
simulation
photons

Keywords

  • Cosmology: theory
  • Diffuse radiation
  • Galaxies: haloes
  • Galaxies: high-redshift
  • Intergalactic medium
  • Large-scale structure of Universe

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The contribution of the IGM and minihaloes to the 21-cm signal of reionization. / Yue, Bin; Ciardi, Benedetta; Scannapieco, Evan; Chen, Xuelei.

In: Monthly Notices of the Royal Astronomical Society, Vol. 398, No. 4, 10.2009, p. 2122-2133.

Research output: Contribution to journalArticle

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