Gravitational lensing

Details Gravitational lensing Gravitational lensing

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.253b&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 253-256 (SEE N89

Astronomy and Astrophysics

Astronomy

Gravitational Lenses, Iue, Quasars, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Dark Matter, Galactic Clusters, Periodic Variations, Time Lag

Scientific paper

Differential time delay measurements of gravitationally-lensed quasars are discussed. An associated series of measurements made of the twin quasars 0957+561 with IUE gives a possible value of 1.8 yr for the time delay. Radio measurements, made with the VLA at 6 cm wavelength, give a value consistent with the ultraviolet time delay. The ratios SA/SB of the quasar image continuum fluxes are not identical; the radio value, 1.45 + or - 0.02, is significantly different than the ultraviolet value. Microlensing by stars in the foreground galaxy G1 may be responsible; this raises questions concerning the possible effects of microlensing by dark matter in clusters of galaxies or in the universe more generally.

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