Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982acaps...8....1h&link_type=abstract
(Acta Astrophysica Sinica, vol. 8, 1981, p. 1-7.) Chinese Astronomy and Astrophysics, vol. 6, June 1982, p. 93-97. Translation.
Astronomy and Astrophysics
Astrophysics
1
Hubble Diagram, Quasars, Red Shift, Approximation, Deceleration, Iteration, Luminosity
Scientific paper
A mesh method, a curve-fitting technique, and an approximate method are used to investigate the Hubble diagrams of four different sets of quasars on the assumptions of a Friedmann universe and mainly cosmological redshifts. The four data sets comprise, respectively: (1) 26 quasars with resolved radio components, steep radio spectra, and large angular diameters; (2) 27 quasars with strong interplanetary scintillation; (3) 24 quasars with a light variation of not more than 0.5; and (4) eight compact radio quasars resolved by VLBI. All the values derived for the deceleration parameter (q0) are found to be greater than 1/2. Other results indicate that the different types of quasars may undergo different kinds of luminosity evolution and that the strict redshift-apparent magnitude relation should be applied to derive q0 from Hubble diagrams of quasars.
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