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- W4253738814 abstract "High-resolution MERLIN observations of a newly discovered four-image gravitational lens system, B0128+437, are presented. The system was found after a careful re-analysis of the entire CLASS data set. The MERLIN observations resolve four components in a characteristic quadruple-image configuration; the maximum image separation is 542 mas and the total flux density is 48 mJy at 5 GHz. A best-fitting lens model with a singular isothermal ellipsoid results in large errors in the image positions. A significantly improved fit is obtained after the addition of a shear component, suggesting that the lensing system is more complex and may consist of multiple deflectors. The integrated radio spectrum of the background source indicates that it is a gigahertz peaked spectrum source. It may therefore be possible to resolve structure within the radio images with deep VLBI observations and thus to constrain the lensing mass distribution better." @default.
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- W4253738814 date "2000-12-01" @default.
- W4253738814 modified "2023-09-25" @default.
- W4253738814 title "A new quadruple gravitational lens system: CLASS B0128+437" @default.
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- W4253738814 doi "https://doi.org/10.1111/j.1365-8711.2000.04033.x" @default.
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