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High Velocity Gas in the Galactic Halo and Disk

Published online by Cambridge University Press:  30 March 2016

Klaas S. de Boer
Klaas S. de Boer*
Affiliation:
Astronomisches Institut, D7400 Tübingen, West Germany

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The progress in the understanding of the high velocity component of the interstellar medium is reviewed. Emphasis is on the velocities seen outside the plane of the Milky Way, of gas in the galactic halo.

The extensive measurements of interstellar absorption lines in the late 1930’s demonstrated that the “stationary” lines in stellar spectra were extremely narrow and in many cases showed fine structure at the 10 km/s level. The quantisation of these data had to wait until about 1950. Adams (1949) presented data on Ca II lines toward some 300 stars and his compilation, supplemented with Na I data, led Routly and Spitzer (1952) to investigate the systematics of the Ca and Na abundances. Contrary to the non-solar abundance ratio of the majority of the interstellar clouds, the “high velocity” absorptions, defined by Routly and Spitzer as differing in velocity by more than 20 km/s from the local standard of rest, showed a near solar Ca/Na abundance ratio.

Type
Joint Commission Meetings
Information
Highlights of Astronomy , Volume 6: Highlights of Astronomy. As presented at the XVIIIth General Assembly of the IAU, 1982 , 1983 , pp. 655 - 663
Copyright
Copyright © Reidel 1983

References

Adams, W.S. 1949, Ap. J. 109, pp.354 Google Scholar
Blaauw, A. 1952, B. A. N. 11, pp.459 Google Scholar
Blades, J.C. 1981, M.N.R.a.S. 196, pp.65pCrossRefGoogle Scholar
Bregman, J. 1980, Ap. J. 236, pp.577 CrossRefGoogle Scholar
Burton, W.B., Gordon, M.A. 1978, Astron. Astrophys. 631, pp.7 Google Scholar
Cohn, H., York, D.G. 1977, Ap. J. 216, pp.408 CrossRefGoogle Scholar
Cox, D.P. 1981, Ap. J. 245, pp.534 Google Scholar
de Boer, K.S., Savage, B.D. 1982, Ap. J. submGoogle Scholar
Dufay, J. 1957, “Nebuleuses Galactiques et Matiere Interstellaire”, Hutchinson and Co.Google Scholar
Fich, M., Treffers, R.R., Blitz, L. 1982, in “Regions of Recent Star Formation”, pp.201, Ed. Roger, R.S. and Dewdney, P.E., Reidel Google Scholar
Franco, J., Savage, B.D. 1982, Ap. J. 255, pp.541 CrossRefGoogle Scholar
Georgelin, Y.M., Georgelin, Y.P. 1976, Astron. Astrophys. 49, pp.57 Google Scholar
Giovanelli, R. 1980, A. J. 85, pp.1155 CrossRefGoogle Scholar
Hippelein, H., Munch, G. 1981, Astron. Astrophys. 99, pp.248 Google Scholar
Hulsbosch, A.N.M. 1979, in “The Large-scale Characteristics of the Galaxy”, IAU Symp. 84, pp.525, Ed. Burton, W.B., Reidel Google Scholar
Jenkins, E.B., Silk, J., Wallerstein, G., Leep, E.M. 1981, Ap. J. 248, pp.977 Google Scholar
Laurent, C., Paul, J.A., Pettini, M. 1982, Ap. J. 260, in pressGoogle Scholar
Mathewson, D.S., Cleary, M.N., Murray, J.D. 1982, Ap. J. 195, pp.L97 Google Scholar
Meaburn, J. 1977, in “Topics in Interstellar Matter”, pp.81, Ed. Woerden, H. van, Reidel Google Scholar
Münch, G. 1957, Ap. J. 125, pp.42 Google Scholar
Münch, G., Zirin, H. 1961, Ap. J. 133, pp.11 CrossRefGoogle Scholar
Oort, J.H. 1962, in “The Distribution and Motion of Interstellar Matter in Galaxies”, pp.3, Ed. Woltjer, L., Benjamin press Google Scholar
Pettini, M., West, K.A. 1982, Ap. J. 260, in pressGoogle Scholar
Reynolds, R.J. 1980, Ap. J. 236, pp.153 Google Scholar
Reynolds, R.J., Ogden, P.M. 1982, A. J. 87, pp.306 Google Scholar
Routly, P.M., Spitzer, L. 1952, Ap. J. 152, pp.227 Google Scholar
Savage, B.D., de Boer, K.S. 1981, Ap. J. 243, pp.460 Google Scholar
Shapiro, P.R., Field, G.B. 1976, Ap. J. 205, pp.762 CrossRefGoogle Scholar
Songaila, A. 1981, Ap. J. 243, pp.L19 CrossRefGoogle Scholar
Spitzer, L. 1948, Ap. J. 108, pp.276 Google Scholar
Spitzer, L. 1956, Ap. J. 124, pp.20 CrossRefGoogle Scholar
Spitzer, L., Oke, J.B. 1952, Ap. J. 115, pp.222 Google Scholar
Walborn, N.R., Hesser, J.E. 1982, Ap. J. 252, pp.156 Google Scholar
Weaver, R., McCray, R., Castor, J., Shapiro, P., Moore, R. 1977, Ap. J. 218, pp.377 CrossRefGoogle Scholar
York, D.G., Blades, J.C., Cowie, L.L., Morton, D.C., Songaila, A., Wu, C.-C. 1982, Ap. J. 255, pp.467 Google Scholar