The magnituderedshift relation for 561 Abell clusters.
Abstract
The Hubble diagram for the 561 Abell clusters with measured redshifts has been examined using Abell's (1958) corrected photored magnitudes for the tenthranked cluster member (m10). After correction for the Scott effect and K dimming, the data are in good agreement with a linear magnituderedshift relation with a slope of 0.2 out to z = 0.1. New redshift data are also presented for 20 Abell clusters. Abell's m10 is suitable for redshift estimation for clusters with m10 of no more than 16.5. At fainter m10, the number of foreground galaxies expected within an Abell radius is large enough to make identification of the tenthranked galaxy difficult. Interlopers bias the estimated redshift toward low values at high redshift. Leir and van den Bergh's (1977) redshift estimates suffer from this same bias but to a smaller degree because of the use of multiple cluster parameters. Constraints on deviations of cluster velocities from the mean cosmological flow require greater photometric accuracy than is provided by Abell's m10 magnitudes.
 Publication:

The Astronomical Journal
 Pub Date:
 August 1985
 DOI:
 10.1086/113847
 Bibcode:
 1985AJ.....90.1400P
 Keywords:

 Galactic Clusters;
 Hubble Diagram;
 Red Shift;
 Bias;
 Cosmology;
 Estimating;
 Magnitude;
 Astrophysics