What is a Quasar?
- Extremely luminous celestial objects thought to have been stars with high radio signal. The name quasar stands for "quasi-stellar radio source"
What do we know about them?
- Likely to contain a supermassive black hole. Source of high redshift and appears as a point source in the sky as a result. Very distant objects, but are still visible due to its high luminosity. Size is roughly 10-10,000 times Schwarzschild radius of its black hole.
What is Gravitational Lensing?
- Light from a source deflected as a result of passing through a strong gravitational field caused by a celestial object in it's path. Light from a gravitationally lensed source can be used to study various aspects of both the source of light and the object in between.
What are the open questions?
Literature on Quasar Lensing
year - first author - title(url to paper) - data(survey)/theory
2012 - Inada, N. - The Sloan Digital Sky Survey Quasar Lens Search. V. Final Catalog from the Seventh Data Release - SDSS
1999 - Lehar, J. - HST Observations of 10 Two-Image Gravitational Lenses - HST
1996 - Schechter, P. L. - The Quadruple Gravitational Lens PG1115+080: Time Delays and Models - MDM Observatory, NOT, WIYN 3.5-m telescope
1992 - Blandford, R. D. - Cosmological Applications of Gravitational Lensing - Theory
1984 - Turner, E. L. - The Statistics of Gravitational Lenses: The Distribution of Image Angular Separations and Lens Redshifts - Princeton University Observatory
1980 - Young, P. - The Double Quasar Q0957 + 561 A, B: A Gravitational Lens Image Formed by a Galaxy at z=0.39 - 200in. Hale Telescope
1985 - Huchra, J. - 2237 + 0305; A New and Unusual Gravitational Lens - VLA, Whipple Observatory