Gravitational lensing in a cold dark matter universe

Details Gravitational lensing in a cold dark matter universe Gravitational lensing in a cold dark matter universe

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231p..97n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, April 1, 1988, p. 97p-103p.

Statistics

Computation

106

Dark Matter, Gravitational Lenses, Hubble Constant, Mass Distribution, Red Shift, Universe, Computational Astrophysics, Galactic Evolution, Line Of Sight, Perturbation Theory, Power Spectra

Scientific paper

The authors investigate gravitational lensing due to mass condensations in a biased cold dark matter (CDM) universe using the Press-Schechter theory with density fluctuation amplitudes taken from previous N-body work. Under the critical assumption that CDM haloes have small core radii, the authors predict a distribution of image angular separations for high-z lensed quasars with a peak at ≡1 arcsec and a half-width of a factor ≡10. Allowing for selection effects at small angular separations, this is in good agreement with the observed separations. The estimated frequency of lensing is somewhat lower than that observed, but the discrepancy can be removed by invoking amplification bias and by making a small upward adjustment to the density fluctuation amplitudes assumed in the CDM model.

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