The 21cm Signal
The 21cm Signal
The 21cm Signal
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Statistical Measurements<br />
Alternative & complement for imaging: Statistical<br />
measurements.<br />
– First goal: goal:<br />
to reliably detect signatures from reionization.<br />
– Second goal: goal:<br />
to interpret them in terms of astrophysics.<br />
<strong>The</strong> <strong>21cm</strong> line signal is rich in properties:<br />
properties<br />
1. Global signals: signals:<br />
fluctuations.<br />
2. Angular properties: properties:<br />
power spectra<br />
3. Frequency properties: properties:<br />
cross-correlation (ν ( 1, , ν2 )<br />
4. Non-Gaussianity: Non-Gaussianity:<br />
skewness, kurtosis<br />
5. Redshift space effects: effects:<br />
distortions, light cone effect<br />
26 April 2012 EoR2012, Strasbourg 14
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