H2(0-18) in hot dense molecular cloud cores

Details H2(0-18) in hot dense molecular cloud cores H2(0-18) in hot dense molecular cloud cores

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199l...5j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

54

Deuterium, Line Spectra, Molecular Clouds, Abundance, Water Masers

Scientific paper

The authors have used the Kitt Peak 12-m telescope to observe the 313-220 line (203407 MHz) of para-H218O towards several hot dense sources of molecular line emission. They detect a feature at the correct frequency towards Orion-KL, G34.3+0.2, Sgr B2(N), and W51 e1/e2. The problem of blending with emission from other molecular line species is discussed and it is concluded that at least in the case of G34.3+0.2, the identification with H218O is likely to be correct. The rough estimates suggest that in these "hot core" regions, water has an abundance relative to H2 of order 10-5 and is thus less abundant than CO. In Orion-KL, the abundance ratio [HDO]/[H2O] is estimated to be greater than 10-3.

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