XXIVth IAP Colloquium

Far away : light in the young universe at redshift beyond three

Monday July 7 to Friday July 11, 2008

List of RIPAMONTI's Presentation(s) ( Updated 20/01/2011 15:11:48 )

Precise if your presentation is oral or a poster : oral
Title of your presentation : Effects of early black holes upon 21 cm radiation

The regions of the 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 BH population can have much larger influence. I discuss the effects of such emission, looking at a wide range of BH model populations. In all of them the BH radiation easily heats the IGM to 10^3-10^4 K, and achieves partial ionization. The most interesting consequence of this heating is that BHs are expected to induce a 21-cm signal (delta T_b ~ 20-30 mK at z<~12) which should be observable with forthcoming experiments.

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