The angular-size-redshift relation. II - A test for the deceleration parameter

Details The angular-size-redshift relation. II - A test for the deceleration parameter The angular-size-redshift relation. II - A test for the deceleration parameter

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..964h&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 964-975.

Mathematics

Logic

21

Big Bang Cosmology, Deceleration, Galactic Clusters, Galactic Evolution, Red Shift, Statistical Analysis, Data Reduction, Monte Carlo Method, Standard Deviation

Scientific paper

An angular-size-redshift cosmological test is presented based on the projected separations between bright cluster galaxies as the size statistic. The method is applied to 95 clusters of galaxies with redshifts ranging from 0.02 to 0.46, yielding a value of the deceleration parameter before evolution of -0.9. After correcting for known evolutionary effects, a value of -0.8 is obtained. The formal standard deviation in q at these values is 0.2, which corresponds to an uncertainty of about 0.4 at q = 0. It is argued that the selection criteria for the sample, and the observed behavior of the cluster size dispersion with redshift, preclude the existence of any major selection or evolutionary effects in the data.

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