VLBI imaging at 4.9-43.2 GHz resolves symmetric parabolically expanding twin jets in 3C 452 to a few thousand Schwarzschild radii, with low Doppler factors indicating a viewing angle of about 70 degrees.
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A tenfold larger sample of AGN radio source sizes confirms a real angular size-redshift relation but indicates that scatter must drop below 20% or samples reach thousands to 100,000 to constrain Ω_m effectively.
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The twin-jet system in the FRII radio galaxy 3C 452: A sub-parsec scale VLBI study
VLBI imaging at 4.9-43.2 GHz resolves symmetric parabolically expanding twin jets in 3C 452 to a few thousand Schwarzschild radii, with low Doppler factors indicating a viewing angle of about 70 degrees.
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Revisiting the angular size-redshift cosmological test with milliarcsecond radio structures in active galactic nuclei
A tenfold larger sample of AGN radio source sizes confirms a real angular size-redshift relation but indicates that scatter must drop below 20% or samples reach thousands to 100,000 to constrain Ω_m effectively.