The angular diameter-redshift test for quasi-stellar radio sources with large redshifts

Details The angular diameter-redshift test for quasi-stellar radio sources with large redshifts The angular diameter-redshift test for quasi-stellar radio sources with large redshifts

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.182..127h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 182, Jan. 1978, p. 127-145.

Mathematics

Logic

42

Quasars, Red Shift, Size Determination, Astronomical Models, Cosmology, Radiant Flux Density, Relativity

Scientific paper

The radio structures of a complete sample of 40 quasars from the 3CR catalog and of all 19 quasars with redshifts greater than 1.5 in complete samples from the 4C catalog are analyzed. The angular-diameter-redshift (theta-z) plot for bright radio sources is redetermined using improved knowledge of the radio structures and improved statistics at large redshifts. In this form the theta-z test is found to be sensitive to various evolutionary effects; therefore, further analyses of the data are performed to investigate such complications. The possibility that the size of radio sources of the same intrinsic luminosity changes with redshift is tested to a limited extent, and the angular-size distributions of the quasars in the 3CR and 4C samples are compared for different cosmological models. These distributions are shown to be consistent with two alternatives: (1) the hypothesis that the physical sizes of the radio sources do not change with cosmological epoch and (2) weak evolution of the physical sizes in the power-law form proposed by Kapahi (1975).

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