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CO Emission vs HI Self-Absorption

Published online by Cambridge University Press:  25 April 2016

William L. Peters  and
Frank N. Bash
William L. Peters
Affiliation:
Mount Stromlo and Siding Spring Observatories, Australian National University, Canberra
Frank N. Bash
Affiliation:
Astronomy Department, University of Texas
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Extract

We present the initial results of a statistical comparison of CO emission and H I self-absorption in the galactic plane at large distances from the Sun. Evidence for self-absorption by cold atomic hydrogen (Ts < 60 K) over angular scales of 3 ´-20´ was reported by Baker and Burton (1979). They suggested that this hydrogen was associated with the molecular clouds of the ‘molecular ring’ located between 4 and 8 kpc from the galactic center (Burton and Gordon 1978). Burton, Lizst, and Baker (1978) did find a correspondence between CO emission and H I self-absorption; however, their observations were not extensive enough to prove that the correspondence was statistically significant or to test their prediction that all instances of H I self-absorption are accompanied by CO emission and thus associated with molecular clouds.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 5 , Issue 2 , 1983 , pp. 224 - 227
Copyright
Copyright © Astronomical Society of Australia 1983

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References

Baker, P.L., and Burton, W.B., Astron. Astrophys. Suppl, 35, 129 (1979).Google Scholar
Burton, W.B., and Gordon, M.A., Astron. Astrophys., 63, 7 (1978).Google Scholar
Burton, W.B., Liszt, H.S., and Baker, P.L., Astrophys. J.,(Letters), 219, L67 (1978).Google Scholar
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Peters, W.L., and Bash, F.M., ‘Regions of Recent Star Formation’, Roger, R. S. and Dewdney, P. E. , editors, p. 469, D. Reidel Publ.Co. (1982).Google Scholar