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12.2 GHz Methanol Absorption towards Sgr A

Published online by Cambridge University Press:  25 April 2016

R. S. Peng  and
J. B. Whiteoak
R. S. Peng
Affiliation:
School of Physics, University of New South Wales
J. B. Whiteoak
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Abstract

Line absorption associated with the 12.2 GHz 20 − 3-1 transition of CH3OH has been mapped towards Sgr A with the Parkes 64-m radio telescope and a 2 arcmin beam. Two concentrations are present, both offset from the continuum peak, with velocities of 18 and 46 km s-1 and line-to-continuum ratios of 0.59 and 0.30. For the higher ratio the column density is almost 1017 cm-2. The concentrations may be associated with a molecular cloud which overlies Sgr A East but lies in part behind Sgr A West.

Type
Miscellaneous Radio Astronomy
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 2 , 1989 , pp. 204 - 206
Copyright
Copyright © Astronomical Society of Australia 1989

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