Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167....1h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 1-10.
Astronomy and Astrophysics
Astrophysics
21
Cosmology, Galactic Clusters, Gravitational Lenses, Hubble Diagram, Red Shift, Brightness, Correlation, Energy Conservation
Scientific paper
The authors suggest that the Hubble diagram of brightest cluster galaxies (BCG) is strongly affected by gravitational amplifications due to foreground clusters of galaxies. Galaxies from Kristian et al.'s (1978) sample are placed with respect to foreground Zwicky clusters and their deviations from the mean magnitude-redshift relation are compared to the predictions of Ricci gravitational amplification formula. It is found that the gravitational brightness increase reaches some tenth of magnitudes for these BCGs and that it has induced a strong selection effect artificially increasing the deceleration parameter q0. Once these effects are accounted for the Hubble diagram value of q0 might agree with the low values obtained for the density parameter σ0(≡0.1 - 0.2) without any need for rapid evolution.
Hammer Francçois
Nottale Laurent
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