Abstract
Setti and Woltjer1,2 have shown that the large scatter in the Hubble diagram for quasars (see Sandage3) may be greatly reduced if quasars with steep radio spectra and extended structures are considered alone. For this type of quasar there is a marked correlation between apparent optical magnitude and redshift, with a slope similar to that found for normal radio galaxies and the brightest galaxies in clusters.
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References
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STANNARD, D. Physical Sciences: Interpretation of the Hubble Diagram for Quasars. Nature 246, 295–297 (1973). https://doi.org/10.1038/246295a0
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DOI: https://doi.org/10.1038/246295a0
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