Radiation from early black holes - I. Effects on the neutral intergalactic medium

E. Ripamonti*, M. Mapelli, S. Zaroubi

*Bijbehorende auteur voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

26 Citaten (Scopus)
147 Downloads (Pure)


In the pre-reionization Universe, the regions of the intergalactic medium (IGM) which are far from luminous sources are the last to undergo reionization. Until then, they should be scarcely affected by stellar radiation; instead, the X-ray emission from an early black hole (BH) population can have much larger influence. We investigate the effects of such emission, looking at a number of BH model populations (differing for the cosmological density evolution of BHs, the BH properties, and the spectral energy distribution of the BH emission). We find that BH radiation can easily heat the IGM to 10(3)-10(4) K, while achieving partial ionization. The most interesting consequence of this heating is that BHs are expected to induce a 21-cm signal (delta T(b) similar to 20-30mK at z less than or similar to 12) which should be observable with forthcoming experiments (e. g. LOFAR). We also find that at z less than or similar to 10 BH emission strongly increases the critical mass separating star-forming and non-star-forming haloes.

Originele taal-2English
Pagina's (van-tot)158-172
Aantal pagina's15
TijdschriftMonthly Notices of the Royal Astronomical Society
Nummer van het tijdschrift1
StatusPublished - 11-jun.-2008

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