Juan R.
Pardo-Carrion
Main Results
Water and deuterated water abundances
and distributions in Orion IRc2
Although of difficult access form the ground, the 3(1,3)-2(2,0) and 5(1,5)-4(2,2) transitions of H2O, at 183 at 325 GHz respectively, have been observed and mapped around the central position of Orion IRc2 using the IRAM 30m and the CSO telescopes. The 183 emission is extended, and the 325 GHz one much less extended. Comparison of the line intensities puts useful constrains on the density and temperature of the emitting regions and allows to estimate H2O abundance (10**(-4) in the Plateau and 10**(-6)-10**(-5) in the Ridge. Later on, the 2(1,2)-1(1,1) and 1(1,1)-0(0,0) HDO transitions at 849 and 894 GHz were also mapped in the same region with the CSO telescope. HDO/H2O was found to be in the range 0.004 to 0.01, a relatively high ratio for a TK of 150 K, suggesting that HDO has recently evaporated from dust grain mantles.
You can get more information about this work by downloading paper 9 and paper 23 from my publications list.
