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The Status of the Hubble Diagram In 1986

Published online by Cambridge University Press:  19 July 2016

Hyron Spinrad  and
S. Djorgovski
Hyron Spinrad
Affiliation:
Astronomy Department University of California, Berkeley, CA 94720, USA
S. Djorgovski
Affiliation:
Harvard–Smithsonian Center for Astrophysics, 60 Garden St. Cambridge, MA 02138, USA

Abstract

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We present visual and near-infrared Hubble diagrams for first-ranked cluster galaxies, and moderate-flux and high-flux radio galaxies. The photometric improvements and the extension of the diagrams to large redshifts (up to z ≃ 1.8) for both 3CR and “1 Jy” class radio galaxies are highlighted. The absolute luminosities of these three types of “standard candles”, where their redshifts overlap, agree adequately. The near-IR (2μm) Hubble diagrams may be used to determine the global deceleration parameter, q0, and the current data favor q0 ∼ +0.2 to +0.3. The sensitivity to evolutionary changes in the giant galaxies is quite modest at these long wavelengths. On the other hand, the visual regime (BV R) shows a dramatic dependence on differential evolution effects, which dominate over the cosmological model differences. Most radio galaxies apparently have had active star formation, with a continually declining rate, but a few are quite faint and red; they may have had a relatively passive evolution.

Type
Chapter III. The Classical Quantities of Cosmology
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 129 - 141
Copyright
Copyright © Reidel 1987 

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