Gravitational lensing by spheroidal galaxies. Multiple image probabilities and image separation statistics.
Abstract
Probabilities of detection of multiple imaged quasars due to the gravitational lensing are calculated. Spheroidal galaxies with Hubble mass distribution, obeying Schechter luminosity function, are used as lenses. Predicted number of observed objects seems to be acceptable for mass-to-light ratio about 50. Separation statistics for two brightest images is also presented. Mean separations are larger than in spherically symmetric case and are not in a big disagreement with observations if the observational selection is concerned. In addition, the problem of detection of the lensing galaxy is discussed. It is found that, under the average conditions, there is only a small chance of observing the galaxy (which should be closer than at z = 0.25).
- Publication:
-
Acta Astronomica
- Pub Date:
- 1988
- Bibcode:
- 1988AcA....38....1P
- Keywords:
-
- Galaxies;
- Gravitational Lenses;
- Quasars;
- Statistical Analysis;
- Galactic Structure;
- Hubble Diagram;
- Luminosity;
- Mass Distribution;
- Mass To Light Ratios;
- Photons;
- Astronomy