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The Status of the Hubble Diagram In 1986

Spinrad, Hyron and Djorgovski, S. (1987) The Status of the Hubble Diagram In 1986. In: Observational Cosmology. International Astronomical Union. No.124. Springer , Dordrecht, pp. 129-141. ISBN 978-90-277-2476-2.

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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, q_O, and the current data favor q_O ~ +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.

Item Type:Book Section
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Djorgovski, S.0000-0002-0603-3087
Additional Information:© 1987 IAU. We thank Drs. M. Rieke, J. Silk, R. Wyse, and M. Davis for their comments and encouragement, and for the use of unpublished data. Mark Dickinson provided valuable assistance with our new CCD photometry, and Patrick McCarthy and Michael Strauss helped with related work. H. S. wishes to acknowledge continued support form the U.S. National Science Foundation, and S. D. acknowledges partial support from Harvard University. We again thank the staffs of Kitt Peak, Lick, MMT, and CFHT observatories for their assistance in gathering much of the observational data presented here.
Funding AgencyGrant Number
Harvard UniversityUNSPECIFIED
Subject Keywords:Star Formation; Radio Galaxy; High Redshift; Star Formation Rate; Radio Power
Series Name:International Astronomical Union
Issue or Number:124
Record Number:CaltechAUTHORS:20190730-133248082
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97523
Deposited By: Tony Diaz
Deposited On:01 Aug 2019 20:33
Last Modified:16 Nov 2021 17:32

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