(a) Suppose a uniform, extended HI cloud has a physical temperature of TK D 2:73 K. If the only background source is the 2.73 K microwave background, would you expect to observe the HI line in...


(a) Suppose a uniform, extended HI cloud has a physical temperature of TK D


2:73 K. If the only background source is the 2.73 K microwave background,


would you expect to observe the HI line in emission or absorption or no line


radiation at all?


(b) Repeat if there is a background source with main beam brightness temperature,


TMB D 3 K, that is, TMB > TK. What would be the temperature of the


absorption, TL, in K if


D 1?


(c) Repeat for TK D 3:5 K.



Dec 12, 2021
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