HIGH-DENSITY TRACERS IN OUTFLOW REGIONS - NH3 VS CS

We present CS(J = 1 --> 0) observations of the high density gas in a s ample of eleven star forming regions with molecular or optical outflow s. The sources of this sample cover a wide range of physical sizes. Al l these sources had been previously mapped in NH3 (1,1) with similar a ngular resolution. In all the sources of this sample CS emission was d etected, indicating a global correlation between the emissions traced by the CS and the NH3 molecules. However, the detailed characteristics of these two emissions (e.g., the extent and the location of the emis sion peak) show, in general, significant differences in the sources wh ich are well resolved by the beam. As a general trend, the emission tr aced by the NH3 molecule appears as compact clumps which engulf an out flow activity center. In contrast, the emission traced by the CS molec ule, usually more extended, appears as a background which connects dif ferent outflow activity centers associated with each NH3 clump.