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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
Leung, C.M., and Liszt, H.S., Astrophys. J., 208, 727 (1976).Google Scholar
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