Abstract
The first astronomical detection of the 10.3 GHz, 2<SUB>20</SUB> → 2<SUB>21</SUB>, transition of the molecule HDO is reported. Two components of OMC-1 are identified: the "hot core", and the "spike" component (identified with the "compact molecular ridge cloud". The best-fit parameters in a statistical equilibrium model of the hot core are an effective radiation temperature of T<SUB>rad</SUB> ≡ 350K and a density of n(H<SUB>2</SUB>) ≡ 3×10<SUP>9</SUP>cm<SUP>-3</SUP>. The best-fit parameters for the spike component are T<SUB>rad</SUB> ≡ 40K and n(H<SUB>2</SUB>) ≡ 3×10<SUP>6</SUP>cm<SUP>-3</SUP>. The observations indicate an abundance ratio of [HDO]/[H<SUB>2</SUB>O] ≡ 10<SUP>-3</SUP> in the hot core.
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