Detection of the ground-state transition of HDO

Details Detection of the ground-state transition of HDO Detection of the ground-state transition of HDO

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..55s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L55-L58.

Astronomy and Astrophysics

Astronomy

17

Abundance, Deuterium Compounds, Electron Transitions, Ground State, Interstellar Gas, Brightness Temperature, Radio Astronomy, Radio Spectra, Submillimeter Waves, Water

Scientific paper

The 1(01)-0(00) ground-state transition of deuterated water at v = 464.92 GHz toward the Orion-KL nebula with the CSO 10.4-m telescope is detected. The intensity is approximately that expected on the basis of lower frequency observations. No HDO was detected towards other sources: neither absorption toward strong submm continuum sources, nor collisionally-excited emission from other dense cores. This limits the fractional abundance ratio HDO/H2 to less than about 10 to the -9th - 10 to the -10th, and (with conservative assumptions about the Deuterium fractionation) the abundance of interstellar water, H2O/H2 to less than 10 to the -5th - 10 to the -6th. The much higher fractional abundances reported toward hot-core type sources are probably due to enhanced fractionation onto and recent sublimation off icy grains.

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