Variability in the Einstein Ring Gravitational Lens MG 1131+0456

Details Variability in the Einstein Ring Gravitational Lens MG 1131+0456 Variability in the Einstein Ring Gravitational Lens MG 1131+0456

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1956h&link_type=abstract

Astronomical Journal v.109, p.1956

Astronomy and Astrophysics

Astronomy

3

Gravitational Lensing, Distance Scale

Scientific paper

The Einstein ring gravitational lens MG 1131+0456 is a lens system that includes extended radio emission imaged into a ring and two images of a compact component. Observations of MG 1131 at 8 and 15 GHz at several epochs with the Very Large Array show that the compact components are variable, on time scales of months to years, though only at a level comparable to the measurement error. This variability provides further evidence that the doubly imaged compact component is the core of the background radio source. Models predict a time delay between the signals from the two images. Simulations of measurements of this delay in a source with the variability displayed by MG 1131 indicate that a time delay should be measurable if approximately 100 observations are obtained. Since MG 1131 is a lens system in which models are likely to be well constrained by the extended emission, it is a promising system for a time delay measurement of angular diameter distance.

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