Mathematics – Probability
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..655j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 15, 1992, p. 655-662. Research supported by
Mathematics
Probability
22
Galactic Mass, Gravitational Lenses, Light Transmission, Mass Distribution, Quasars, Red Shift, Astronomical Models, Light Scattering, Monte Carlo Method, Universe
Scientific paper
The light propagation in an inhomogeneous universe is studied using Monte Carlo methods. A model of matter distribution is presented which takes into account galaxies of different masses and radii and correlations in their positions. A simple scheme of simulating the correlated distribution of galaxies is presented. Correlations in galaxy positions increase the probability of observing a distant source highly amplified by foreground gravitational lenses. The amplification bias of the quasar counts is found to be weak but noticeable at bright magnitudes. The estimated overdensity of quasars close to foreground galaxies falls below a factor of 2.
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