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The Absence of 1584 MHz Maser Emission from 18OH

Published online by Cambridge University Press:  25 April 2016

J. L. Caswell  and
R. F. Haynes
J. L. Caswell
Affiliation:
Division of Radiophysics, CSIRO, Sydney
R. F. Haynes
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Extract

In the terrestrial environment the abundance ratio of 18O to the common oxygen isotope 16O is about 1 in 490. Measurements of hydroxyl absorption in the interstellar medium show that 18OH as well as 16OH can be detected towards Sgr A and Sgr B2 (Gardner et al. 1970; Wilson and Barrett 1970; Williams and Gardner 1981); in these two galactic centre regions the 18OH isotopic species has an abundance relative to 16OH of about 1 in 220, somewhat greater than the terrestrial ratio of 18O to 16O.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 2 , 1981 , pp. 237 - 239
Copyright
Copyright © Astronomical Society of Australia 1981

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