Gravitational Lenses: Proceedings of a Conference Held in Hamburg, Germany 9–13 September 1991

The impact of gravitating lensing on astrophysics....Pages 1-11
Introduction to basic concepts of gravitational lensing....Pages 12-26
Optical observations of gravitational lenses....Pages 27-43
Recent radio observations of gravitational lenses....Pages 44-49
Old faithful: The venerable gravitational lens system 0957+561....Pages 50-60
Determining the Hubble parameter....Pages 61-66
Time delay determination for the first gravitational lens Q0957+561 A,B....Pages 67-72
Photometric monitoring of gravitational lenses with the nordic optical telescope....Pages 73-79
A search for closely-spaced gravitational lenses....Pages 80-82
A high-resolution imaging survey for gravitational lenses....Pages 83-87
Search for gravitational lensing in a sample of highly luminous quasars....Pages 88-96
Bidimensional spectrography of multiple quasars....Pages 97-106
Sizing up the universe with an optical illusion: Comments on the measurement of Δ t in Q 0957+561....Pages 107-111
HST observations of G2237+0305 and PG1115+080....Pages 112-116
A star-formation region in 2237+030....Pages 117-121
Redshift measurements of the brightest cluster galaxies of the gravitational lens 0957+561....Pages 122-127
The Triple Quasar PG1115+080....Pages 128-133
1830-211 as a lens artefact....Pages 134-139
0218+357: The smallest separation lensed system....Pages 140-142
Gravitational microlensing....Pages 143-155
The search for massive compact halo objects....Pages 156-162
Probing the galactic disk with gravitational microlensing....Pages 163-163
Searching for microlensing in optical lightcurves of quasars....Pages 164-172
The Hamburg quasar monitoring program at Calar Alto....Pages 173-177
Microlensing predictions for the Einstein cross 2237+0305....Pages 178-182
Expected color variations of the microlensed QSO 2237+0305....Pages 183-188
Intrinsic variability implications for microlensing....Pages 189-195
Gravitational lensing statistics....Pages 196-208
Quasar-galaxy associations....Pages 209-221
Associations between QSOs and galaxies....Pages 222-229
Quasar-galaxy associations....Pages 230-236
Einstein rings and related phenomena....Pages 237-244
Observational indications for statistical lensing by clusters of galaxies....Pages 245-249
Counts of galaxies around distant highly luminous QSOs....Pages 250-255
A search for close separation (≲ 1″) quasar images....Pages 256-263
Joint discussion on quasar-galaxy associations....Pages 264-266
Luminous arcs: An observational update....Pages 267-278
Cluster gravitational lenses....Pages 279-287
Deep galaxy surveys....Pages 288-297
Statistical lensing by clusters of galaxies and Dark Matter distribution....Pages 298-304
Observation and analysis of Abell 2218 arcs and rings....Pages 305-311
New results on Abell 963 and MG1131+0456....Pages 312-317
On the straight arc in A2390....Pages 318-322
A search for gravitational lenses using sky survey plate scans....Pages 323-327
Gravitational lensing of BL Lac objects and related AGN....Pages 328-332
Recent observations of PKS1830-211....Pages 333-337
Possible test for Λ with gravitational lenses....Pages 338-344
Gravitational lensing by large-scale structures....Pages 345-349
Concluding summary....Pages 350-361
Spectrography in the 0957+561 field....Pages 362-362
Gravitational lensing in alternative cosmological models....Pages 363-363
Possibilities for observing lensing effects in the gravitational field of our galaxy....Pages 364-364
The appearance of cross-like quasar images and the estimation of GL parameters....Pages 365-365
Gravitational lensing properties of the Reissner-Nordström type neutron star....Pages 366-366
A search for the optical counterpart of the Einstein ring PKS 1830-211....Pages 367-367
Local behavior of caustics in different lens models....Pages 368-368
Multiple imaging by gravitational waves....Pages 369-369
Statistical lensing by extended lenses....Pages 370-370
VLBI hybrid maps of 0957+561 A,B....Pages 371-373
Deformation of P Cygni line profiles by gravitational microlensing effects....Pages 373-373
Statistical lensing and the overdensity of QSO near foreground galaxies....Pages 374-374
A moving gravitational lens in the Friedmann universe....Pages 375-375
Strong microlensing and BL LAC objects....Pages 376-376
Dispersive effects in the spectra of QSO pairs....Pages 377-377
Our galactic nucleus through the lens's eye of gravity....Pages 378-378
Unobserved lensing agents....Pages 379-379
Discordant redshifts in compact groups of galaxies....Pages 380-380
An analytical approach to quasar variability due to microlensing....Pages 381-381
Morse theory and gravitational microlensing....Pages 382-382
N-body techniques for μ -lensing....Pages 383-383
Statistics of lensing by clusters of galaxies: Giant luminous arcs....Pages 384-384
Spherical opaque gravitational lens models and their implication for Ω 0 ....Pages 385-385
Catastrophe theory and stable images and caustics in gravitational lenses....Pages 386-386
List of contributions not submitted for inclusion....Pages 387-388