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The Redshifts of Extragalactic Objects

Published online by Cambridge University Press:  14 August 2015

Wallace L. W. Sargent
Wallace L. W. Sargent*
Affiliation:
Hale Observatories, California Institute of Technology, Carnegie Institution of Washington, U.S.A.

Abstract

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We review the evidence for a general shift-distance law for galaxies. This is shown directly by a redshift-distance diagram recently prepared by Sandage and Tammann for Sc I galaxies. The distances are measured from H II region diameters and from the diameters of the Sc 1 galaxies themselves for the more distant systems. We also show the redshift-apparent magnitude diagrams for several objects which are identifiable over a large range in distance and which prove to have a small range in absolute magnitude: these are supernovae of type I (Kowal and Sargent, 1973, unpublished), brightest cluster galaxies (Sandage, 1972a), and radio galaxies (excluding N-type galaxies) (Sandage, 1972b). Plots of redshift versus angular size for brightest cluster galaxies (Sandage, 1972c) also have the correct slope for this to be a distance effect. In summary, the tightness of the correlations for the various diagrams listed implies that there is a very close correlation between distance and redshift for galaxies out to at least z = Δλ/λ~0.2 and that there is no evidence for redshift anomalies among the objects in these diagrams.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 58: The Formation and Dynamics of Galaxies , 1974 , pp. 195 - 198
Copyright
Copyright © Reidel 1974 

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