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The z-dependence of the Spin Temperature of HI

Published online by Cambridge University Press:  12 April 2016

Shrinivas R. Kulkarni ,
Carl Heiles ,
J. Van Gorkom  and
John M. Dickey
Shrinivas R. Kulkarni
Affiliation:
U. C. Berkeley
Carl Heiles
Affiliation:
U. C. Berkeley
J. Van Gorkom
Affiliation:
NRAO, Socorro
John M. Dickey
Affiliation:
Univ. of Minnesota, Minneapolis

Extract

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In 1981 we conducted an extensive, low-latitutde, HI 21-cm absorption survey from the VLA. The goal of the survey was to answer the following questions:

(a) What is the vertical distribution of the cold HI clouds?

(b) Do HI clouds get systematically warmer at high |z|?

(c) Does the fraction of warm intercloud medium HI increase with high |z|?

(d) How much HI has been missed in previous HI emission surveys because of optical depth effects?

(e) What is the galactic distribution of cool HI clouds?

Type
The LISM at Radio Wavelengths
Information
International Astronomical Union Colloquium , Volume 81: Local Interstellar Medium , 1984 , pp. 269 - 273
Copyright
Copyright © NASA 1984

References

Dickey, J. M.: 1977, Ph. D. Thesis, Cornell Univ.Google Scholar
Dickey, J. M., Kulkarni, S. R., Van Gorkom, J. and Heiles, C.: 1983, Astrophys. J. Suppl. Ser. 53, 591 Google Scholar
Kulkarni, S. R.: 1983, Ph. D. Thesis, U. C. Berkeley.Google Scholar
Kulkarni, S. R., Blitz, L. and Heiles, C.: 1982, Astrophys. J. 253, L63Google Scholar
Liszt, H. E.: 1983, Astrophys. J. 275, 163 Google Scholar