The cosmological deceleration parameter estimated from the angular-size/redshift relation for compact radio sources

Details The cosmological deceleration parameter estimated from the angular-size/redshift relation for compact radio sources The cosmological deceleration parameter estimated from the angular-size/redshift relation for compact radio sources

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.361..134k&link_type=abstract

Nature (ISSN 0028-0836), vol. 361, no. 6408, p. 134-136.

Astronomy and Astrophysics

Astronomy

104

Astronomical Models, Cosmology, Radio Sources (Astronomy), Red Shift, Luminosity, Universe

Scientific paper

It is shown here that VLBI measurements of compact radio sources associated with active galaxies and quasars may be largely free of evolutionary effects event at substantial redshifts. The relation between angular size and redshift for a sample of these sources indicates a value of q(0) close to 0.5, corresponding to cosmological density near the critical value.

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