Ground-State OH Anomalies in the Direction of the Galactic Centre
Open Access
- 1 March 1976
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 174 (3) , 627-636
- https://doi.org/10.1093/mnras/174.3.627
Abstract
The OH clouds along the line of sight towards the galactic centre region produce widespread anomalous emission and absorption in the ground-state satellite-line profiles at 1612 and 1720 MHz. The anomalies are consistent with a transfer of population between the F = 1 and the F = 2 hyperfine levels of the ground state. For the clouds in the nuclear disk the radiation causing the transfer may be associated with the infrared sources in the galactic nucleus; for the other clouds the radiation must originate farther out from the nucleus.Keywords
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