21cm tomography

21cm map

Radio map of redshifted 21cm emission against the CMB in an open CDM cosmology at z = 8.5 (the results would be similar for a &Lambda CDM cosmology). The linear size of the simulation volume is 20h-1 (comoving) Mpc. The point spread function of the synthesized beam is assumed to be a spherical top-hat with a width of 2 arcmin. The frequency window is 1 MHz around a central frequency of 150 MHz. The color intensity runs from 1 to 6 &mu Jy per beam. For clarity, the contour levels outline regions with signal greater than 4&mu Jy per beam. (From Tozzi et al. 2000.)

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