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- W2950781723 abstract "For a wide variety of cosmological models characterized by the cosmic mass density $Omega_M$ and the normalized cosmological constant $Omega_{Lambda}$, we derive an analytic expression for the estimate of magnification cross-sections by an ensemble of isothermal spheres as models of galactic mass distributions. This provides a simple approach to demonstrate how the lensing probability by galaxies depends on the cosmological parameters. An immediate consequence is that, while a non-zero cosmological constant indeed leads to a significant increase of the lensing probability as it has been shown in the literature, only a small fraction of sky to $zsim 3$ can be moderately ($mu sim 1.3$) lensed by galaxies even in a $Lambda$-dominated flat universe. Therefore, whether or not there is a nonzero cosmological constant, it is unlikely that the overall quasar counts have been seriously contaminated by the presence of galactic lenses." @default.
- W2950781723 created "2019-06-27" @default.
- W2950781723 creator A5081090682 @default.
- W2950781723 date "2000-07-29" @default.
- W2950781723 modified "2023-10-11" @default.
- W2950781723 title "Magnification cross-sections of gravitational lensing by galaxies in general FLRW cosmologies" @default.
- W2950781723 hasPublicationYear "2000" @default.
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