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Table 14:

Estimated largest possible absorption intensity $T_{\rm b}$ at different observing frequencies for optically thick absorption lines assuming that the background temperature is the CMB.

Obs. Freq.
Max intensity $\mid T_{\rm b} \mid $
  $T_{\rm ex}$= 0 $T_{\rm ex}$= 0.90 $\times $ $T_{\rm CMB}$ $T_{\rm ex}$= 0.98 $\times $ $T_{\rm CMB}$
[GHz] [mK] [mK] [mK]
1 2700 270 54
50 1700 250 51
100 1000 210 42
200 290 97 21
300 73 33 7.5
400 17 9.1 2.2
500 3.6 2.2 0.6
600 0.74 0.5 0.1

Notes. We have calculated this using Eq. (23) and $T_{\rm ex}$ = 0, $T_{\rm ex}$ = 0.90 $\times $ $T_{\rm CMB}$and $T_{\rm ex}$ = 0.98 $\times $ $T_{\rm CMB}$. Note that these values are redshift independent.


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