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Spiral structure in external galaxies

Published online by Cambridge University Press:  14 August 2015

W. W. Morgan
W. W. Morgan*
Affiliation:
Yerkes Observatory, Williams Bay, Wisc., U.S.A.

Abstract

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The need for observing at least four different categories of optical objects for a satisfactory definition of optical spiral structure is emphasized. A sequence of optical form-types for the description of spiral structure is outlined. A pronounced difference in the nature of the spiral structure of the outer and inner parts of Messier 33 is illustrated. Striking local differences between spiral arms defined by differing criteria are noted.

Type
Part I/Spiral Structure in Galaxies
Information
Symposium - International Astronomical Union , Volume 38: The Spiral Structure of our Galaxy , 1970 , pp. 9 - 14
Copyright
Copyright © Reidel 1970 

References

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Sandage, A.: 1961, The Hubble Atlas of Galaxies, Carnegie Institution of Washington, Washington.Google Scholar