Gravitational lens model of the double QSO 0957+561 A, B incorporating VLBI features
Open Access
- 1 September 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 210 (1) , 79-88
- https://doi.org/10.1093/mnras/210.1.79
Abstract
The twin quasar QSO 0957+561 A, B along with bright radio arches and VLBI structures is modelled using a gravitational lens consisting of the giant elliptical galaxy and the background cluster. The effective time-delay between components A and B comes out to be around one yr, which is significantly different from the value obtained by Young et al. for similar set of lens parameters. It is demonstrated that the observed intensity variation in component B between 1979 and mid-1981, reported by Keel (1982) can result from minilensing by low mass stars.Keywords
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