Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178....1w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 1-6.
Astronomy and Astrophysics
Astrophysics
11
Cosmology, Galaxies, Hubble Diagram, Quasars, Brightness, Carbon, Luminosity, Nonthermal Radiation, Red Shift, Spectral Line Width
Scientific paper
Hubble diagrams are constructed using 2.2 μ magnitudes for 3CR galaxies and λ0 1548 magnitudes for quasars. Each set of data shows a marked increase in brightness at large redshift relative to that expected in Friedmann Cosmologies with densities equal to or less than the critical density. The very similar evolution found for galactic giant branch stars and the quasar non-thermal continuum places constraints on possible models for the evolution. Additional constraints exist for quasar evolution since the correlation between the rest frame continuum at λ1548 and the rest frame equivalent width of C IV λ1548 is observed to be independent of redshift. An alternative explanation is that the apparent brightening at high z may be due to the space-time structure of the Universe.
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