AAO Colloquium
Wednesday 27 October 2010
3:30pm AAO Conference Room
The 21cm Forest
Katie Mack, Kavli Institute/Institute for Astronomy, Cambridge
Future observations of the "21cm forest" against high-redshift radio
sources will allow us to trace out the structure of neutral hydrogen
in the pre-reionization intergalactic medium (IGM), provided bright
radio sources can be found at sufficiently high redshift. I will
present a calculation of the expected 21cm forest as might be observed
in coming years and discuss the trade-off between the availability of
large populations of high-redshift background radio sources and the
requirement for the IGM to be sufficiently neutral for strong
absorption in 21cm.
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