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Title:
Spectrophotometry of faint cluster galaxies and the Hubble diagram - an approach to cosmology
Authors:
Gunn, J. E.; Oke, J. B.
Affiliation:
AA(Hale Observatoires, Pasadena, Calif.), AB(Hale Observatoires, Pasadena, Calif.)
Publication:
Astrophysical Journal, vol. 195, Jan. 15, 1975, pt. 1, p. 255-268. (ApJ Homepage)
Publication Date:
01/1975
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Photometry, Big Bang Cosmology, Galactic Clusters, Hubble Diagram, Red Shift, Spectrophotometry, Astronomical Catalogs, Astronomical Spectroscopy, Elliptical Galaxies, Galactic Evolution, Quasars, Tables (Data)
DOI:
10.1086/153325
Bibliographic Code:
1975ApJ...195..255G

Abstract

New spectrophotometric data are presented for large-redshift galaxies in clusters. A new approach to aperture corrections and the analysis of the Hubble diagram is outlined, including the explicit incorporation of evolutionary effects. The importance of selection effects on the usual methods of analysis are in principle overcome in the analysis, although the heterogeneity of the sample still makes conclusions about cosmology slightly suspect. Formal values of the deceleration parameter are derived under several sets of assumptions, yielding results between +0.33 and -1.27 with formal standard deviations of order 0.7.

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