Gravitational lensing - models.
Abstract
Qualitative features of gravitational lensing are discussed in terms of a scalar framework based on Fermat's principle. The lensing action of galaxy-like models with spherical and elliptical mass distributions are described. The elliptical model has three distinct regimes of lensing, of which two correspond to lensing with three images and one with five images. One of the three-image geometries has been frequently explored in the past. Models proposed for 0957 + 561 correspond to this. The five-image geometry has been invoked for 1115 + 080. Some general model-independent properties of gravitational lensing are listed. If image parities were available, it might be possible to make statements about the lensing mass even when it is made up of dark matter.
- Publication:
-
Quasars
- Pub Date:
- 1986
- Bibcode:
- 1986IAUS..119..529N
- Keywords:
-
- Astronomical Models;
- Fermat Principle;
- Gravitational Lenses;
- Vector Analysis;
- Asphericity;
- Astigmatism;
- Galaxies;
- Mass Distribution;
- Temporal Distribution;
- Astrophysics;
- Gravitational Lenses:Models;
- Gravitational Lenses:Quasars;
- Quasars:Gravitational Lenses