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Optic-Disk

懶洋洋

The impact of gravitating lensing on astrophysics,k, in which he concluded that, despite the observational progress over the previous decade, lensing had made disappointingly little impact on general astrophysics. He is giving the summary at the end of this meeting too, and it will be interesting to see if he is more optimistic and encouraged. We c

過度

Optical observations of gravitational lenses,ational Lensing” (Toulouse, September 1989). After describing the main surveys and photometric monitorings which are being carried out in the form of systematic searches for gravitational lensing effects, we review the optical observations published during the last two years for selected individual

AXIOM

Old faithful: The venerable gravitational lens system 0957+561,nalysis of optical and radio light-curves appears to have yielded reliable values for the time delay .. for the images A and B of Q0957+561. A similarly recent analysis of early X-ray observations yields a core-halo model consistent with models for the lens. The ultimate uncertainty achievable for p

Manifest

Determining the Hubble parameter,.. The results are compared with those based on more detailed modelling. The importance of an improved understanding of galaxy dynamics for the modelling of lens systems and the determination of H. is stressed.

fixed-joint

A search for closely-spaced gravitational lenses,s in a sample of 101 bright quasars. No convincing objects were found. Several widely-separated (1 – 6 arc-sec) point source companions were detected but half of these are known to be stars, and it is argued that the remainder are also likely to be stars. A slight excess of galaxy companions to the

詳細(xì)目錄

REIGN

Search for gravitational lensing in a sample of highly luminous quasars,rning the multiple images and the associations of galaxies with quasars, are examined. We find a significant overdensity of galaxies very close to the line-of-sight, to the HLQs. We also report the discovery of a new multiply lensed quasar candidate.

NUL

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