Gravitational focusing and the association of distant quasars with foreground galaxies

Details Gravitational focusing and the association of distant quasars with foreground galaxies Gravitational focusing and the association of distant quasars with foreground galaxies

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.291..620c&link_type=abstract

Nature, vol. 291, June 25, 1981, p. 620-624.

Astronomy and Astrophysics

Astrophysics

108

Astronomical Photometry, Galaxies, Gravitational Effects, Image Intensifiers, Quasars, Relativity, Astrophysics, Scaling Laws, Spatial Distribution, Wave Dispersion

Scientific paper

The surface density of quasars brighter than a given threshold is enhanced near a galaxy by the gravitational focusing of light from those quasars that are nearly co-aligned with individual stars in the galaxy halo. The focusing can intensify and make detectable quasars which would otherwise have been below the threshold. If galaxies have massive haloes of macroscopic objects then the resulting enhancement could explain the apparent association between quasars and galaxies with discrepant redshifts found in a statistical analysis. Therefore, such quasar-galaxy associations need not require the abandonment of the cosmological interpretation of the redshift.

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