Low-frequency VLBI observations of the gravitational lens 0218+357
O. Wucknitz [1]
- Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, Netherlands
Abstract
B0218+357 is one of the most interesting gravitational lens systems we know.
Radio maps show two bright core images plus a highly structured Einstein ring,
being caused by the multiply imaged and distorted jet of the background source.
Recently the time delay of this system has been used to determine the Hubble
constant with high accuracy. In this talk I present new observations which for
the first time show the structure of the radio ring with VLBI techniques at high
resolution. The data will be used to improve the lens models and to investigate
effects of the ISM of the lensing galaxy on the radiation from the background
source. The lens effect provides two images of one and the same background
sources. Any differences not being explained by the lens effect must be due to
differences in the ISM properties along the two lines of sight.
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Script last modified on 7 Sep 2010
Last change to this data base entry on 23 May 2006