Detection of the 2(20) to 2(21) transition of HDO in Orion A - Evidence for dense clumped gas in the hot core

Details Detection of the 2(20) to 2(21) transition of HDO in Orion A - Evidence for dense clumped gas in the hot core Detection of the 2(20) to 2(21) transition of HDO in Orion A - Evidence for dense clumped gas in the hot core

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..376p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 376-383. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

6

Electron Transitions, Heavy Water, Interstellar Gas, Molecular Clouds, Orion Nebula, Brightness Temperature, Molecular Energy Levels, Virial Theorem, Water Masers

Scientific paper

The first astronomical detection of the 10.3 GHz, 220 → 221, 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 Trad ≡ 350K and a density of n(H2) ≡ 3×109cm-3. The best-fit parameters for the spike component are Trad ≡ 40K and n(H2) ≡ 3×106cm-3. The observations indicate an abundance ratio of [HDO]/[H2O] ≡ 10-3 in the hot core.

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