Hostname: page-component-7bb8b95d7b-w7rtg Total loading time: 0 Render date: 2024-09-18T06:47:19.868Z Has data issue: false hasContentIssue false

Matter far from the galactic plane associated with spiral arms

Published online by Cambridge University Press:  14 August 2015

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

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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
Copyright
Copyright © Reidel 1970 

References

Blaauw, A.: 1962, in The Distribution and Motion of Interstellar Matter in Galaxies (ed. by Woltjer, L.), Benjamin, New York, p. 63.Google Scholar
Habing, H. J.: 1966, Bull. Astron. Inst. Netherl. 18, 323.Google Scholar
Lindblad, P. O.: 1967, Bull. Astron. Inst. Netherl. 19, 34.Google Scholar
Schmidt, M.: 1957, Bull. Astron. Inst. Netherl. 13, 247.Google Scholar