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Matter far from the galactic plane associated with spiral arms

Published online by Cambridge University Press:  14 August 2015

J. H. Oort
J. H. Oort*
Affiliation:
Leiden Observatory, Leiden, The Netherlands

Abstract

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Neutral hydrogen concentrations were studied in the region between 48° and 200° longitude (new) and +6° and +20° latitude. Gas associated with individual arms beyond the sun has been found up to distances from 1 to 2 kpc from the galactic plane with an average density between 1 and 2% of that in the arm centres. The gas with the highest negative velocities shows a different behaviour. This has no counterpart in the plane, and it shows little or no concentration towards lower latitudes. Contrary to the hydrogen associated with the arms its distribution is highly asymmetrical. It does not seem to exist at negative latitudes. It may be of a similar origin as the high-velocity gas in high galactic latitudes near the sun.

Type
Part II/Observations of Spiral Structure in Our Galaxy
Information
Symposium - International Astronomical Union , Volume 38: The Spiral Structure of our Galaxy , 1970 , pp. 142 - 146
Copyright
Copyright © Reidel 1970 

References

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