Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..151s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 151-158.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Models, Cosmology, Distance, Galactic Clusters, Red Shift, Brightness, Magnitude, Statistical Analysis, Virgo Galactic Cluster
Scientific paper
Galaxy clusters have formed the basis for the hypothesized 'standard candles' used in studies of the redshift-magnitude relation by the Hubble school. The present investigation is concerned with the implications of operational cluster-defining constraints, taking into account primarily the type of cluster defined by Abell (1958). Attention is given to the physical implications of the Abell-type definition and the use of so-defined clusters as cosmological test objects. It is found that a distance dependence of Abell clusters comes on top of other serious problems regarding a use for cosmological testing. Both the distance dependence of Abell clusters and the cosmology dependence of the apertures of measurement of magnitudes of the 'brightest cluster galaxies' appear quite substantial and distort the magnitude-redshift relation towards a larger slope for the magnitude-redshift relation.
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