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HI Absorption in NGC 4945

Published online by Cambridge University Press:  25 April 2016

J. B. Whiteoak  and
F. F. Gardner
J. B. Whiteoak
Affiliation:
Division of Radiophysics, CSIRO, Sydney
F. F. Gardner
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Extract

NGC 4945 is a ninth-magnitude southern galaxy orientated almost edge-on to the line-of-sight. De Vaucouleurs and de Vaucouleurs (1964) list its classification as SB(s)cd and its optical dimensions as 17’ x 3’ arc. It is of particular interest because 18 cm OH and 6 cm H2CO absorption has been detected (Whiteoak and Gardner 1973; Gardner and Whiteoak 1974) in molecular clouds in this galaxy which overlie the small-diameter radio source located near the nucleus. In reporting the detection of the OH absorption we suggested that the HI profile in the direction of the nucleus was affected by HI absorption. In this paper we describe a study of the HI distribution which substantiates this conclusion.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 3 , Issue 1 , September 1976 , pp. 71 - 72
Copyright
Copyright © Astronomical Society of Australia 1976

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References

de Vaucouleurs, G., and de Vaucouleurs, A., ‘Reference Catalogue of Bright Galaxies’ (Univ. of Texas Press, Austin) (1964).Google Scholar
Gardner, F. F., and Whiteoak, J. B., Nature, 247, 526 (1974).CrossRefGoogle Scholar
Robinson, B. J., Gardner, F. F., van Damme, K. J., and Bolton, J. G., Nature, 202, 989 (1964).CrossRefGoogle Scholar
Shobbrook, R. R., and Shaver, P. A., Observatory, 87, 169 (1967)Google Scholar
Whiteoak, J. B., and Gardner, F. F., Astrophys. Lett., 15, 211 (1973).Google Scholar