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Table 11:

Estimated largest possible brightness temperature $T_{\rm b}$ for optically thick resonant lines, and $\upsilon _p(z)$ =  $600/\sqrt {1+z}$ km s-1.

Obs. Freq.
Maximum $\mid T_{\rm b} \mid $ [mK]
[GHz] z = 10 z = 30 z = 100
1 1.6 0.98 0.54
50 1.5 0.92 0.51
100 1.3 0.76 0.42
200 0.64 0.38 0.21
300 0.24 0.14 0.078
400 0.071 0.042 0.024
500 0.019 0.011 0.006
600 0.005 0.003 0.002

Notes. This velocity is typical for clusters while for a smaller mass it could be higher. Note, that these values are the same for all species and transitions.


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