... These antennas will be used to measure the very faint signals from the Epoch of Reionisation, back from the dawn of the Universe, when the first stars were switching on and beginning to ionize the hydrogen gas surrounding the galaxies. ...
... I k T nH (2.1) where x = n e =nH is the ionization degree, k is Boltzmann constant, m is the mass of electron, T is the CBR temperature, Їh is Plank constant, nH = n p + n 0 is the hydrogen density in the Universe and I is ionization potential of hydrogen ...
... et al. 2008) : 16.3% ± 3.5% in [-130 ; - 40] km s-1 Hydrogen atoms must be present above 3.3 Rp at very high velocity, in the ... that there are enough electrons at high altitudes for ionized magnesium to recombine efficiently into neutral magnesium ...
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... for these model calculations are the hydrogen particle density ( typically in the ... the surface of a PDR as far as the UV radiation is strong enough to ionize carbon ...
... for these model calculations are the hydrogen particle density (n(H) typically in ... a theoretically predicted parameter space for hydrogen particle density (n(H) = 10 3 ...