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Geometrical Parameters of E+S Pairs

Published online by Cambridge University Press:  12 April 2016

Roberto Rampazzo  and
Jack W. Sulentic
Roberto Rampazzo
Affiliation:
Osservatorio Astronomico di Brera, Milano – Italy
Jack W. Sulentic
Affiliation:
University of Alabama, Tuscaloosa – USA

Extract

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• Clues Concerning Galaxy Formation. Local environmental conditions (i.e. density and angular momentum properties of protogalactic clouds) are thought to be factors affecting the ultimate morphology of a galaxy. The existence of significant numbers of mixed morphology (E/SO + S) pairs of galaxies would represent a direct challenge to this idea unless all early-type components are formed by mergers. We wish to isolate candidate E+S pairs for detailed study with several questions in mind:

a) Are most of the pairs true E+S systems OR, as the theory would suggest more morphologically concordant pairs involving primarily late-type or disky galaxies alone (i.e. misclassified lenticulars)?

b) Assuming that many of the pairs are E+S, do their properties differ in any way from E and S galaxies in the field?

c) Is their evidence that E galaxies in mixed pairs are preferentially merger products?

Type
I. Classical Observations of Pairs
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 47 - 51
Copyright
Copyright © NASA 1990

References

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