Multi-frequency VLBI observations of the lens system B0128+437

Details Multi-frequency VLBI observations of the lens system B0128+437 Multi-frequency VLBI observations of the lens system B0128+437

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..193b&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

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Scientific paper

We present high-resolution VLBI observations of the gravitational lens system B0128+437 discovered as part of the CLASS survey. VLBA observations at 5 GHz of this four-image system show that the background source consists of three separate sub-components, potentially giving a very large number of constraints when constructing the lens model. However, the three sub-component morphology is only reproduced in three of the images, the fourth image looking significantly different to the others. At the same time, a model of the mass distribution in the lens derived from MERLIN 5-GHz observations cannot reproduce the orientation of the sub-components in another of the images. The reasons for these unusual discrepancies are discussed, especially in the light of more recent VLBA+Effelsberg observations at 8.4 and 2.3 GHz. We briefly discuss the ionospheric corrections that can now be applied to radio interferometric data.

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