Abstract
We have made observations of the (1,1) and (2,2) inversion lines of ammonia (NH3) towards the dark cloud region containing the Herbig-Haro (HH) objects 24–27. These transitions are only excited at H2 densities >104 cm−3, and thus probe high density gas. From the observed hyperfine splitting one can calculate optical depths. The optical depth ratio can be used to determine the rotational temperature T21 which is equal to the kinetic temperature under dark cloud conditions.
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