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Disk and spheroidal components of external galaxies: an overview

Published online by Cambridge University Press:  14 August 2015

S. E. Strom  and
K. M. Strom
S. E. Strom
Affiliation:
Kitt Peak National Observatory∗
K. M. Strom
Affiliation:
Kitt Peak National Observatory∗

Extract

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A brief review of current theoretical views on how disk and spheroidal galaxies form and evolve provides the background for a summary of recent optical observations of external galaxies. Primary emphasis is placed on a discussion of the large-scale distribution and chemical composition of the stellar and gaseous constituents of relatively isolated galaxies. New studies of halo and disk surface-brightness distributions in spiral and SO galaxies are summarized. The “missing mass” in galactic halos, the relationship between disk size and luminosity, the nonexponential character of disk light distributions and very low-surface-brightness disk systems are highlighted in this section. Next discussed are observations which may provide insight into the factors which regulate the star-forming history of galactic disks and the post-astration appearance of spiral galaxies. Finally, the observed properties of relatively isolated disk galaxies are compared with those located in dense groups. It appears from this comparison that environment plays a significant role in governing the evolutionary history of a galaxy.

Type
I. PERSPECTIVE
Information
Symposium - International Astronomical Union , Volume 84: The Large-Scale Characteristics of the Galaxy , 1979 , pp. 9 - 26
Copyright
Copyright © Reidel 1979 

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