LensCLEAN models for JVAS B0218+357

Talk given at the Ringberg workshop "Gravitational LENSES 2002", July 2002

O. Wucknitz [1,2,3]

  1. Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
  2. Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK
  3. Potsdam University, Department of physics, Am Neuen Palais 10, D-14469 Potsdam

Abstract

The "golden lens" B0218+357 has only one disadvantage for cosmological applications: It is the system with the smallest known image separation and the lens position has not been measured accurately yet. We present results of our modelling efforts using an improved version of the LensCLEAN method. We can constrain the model parameters with a sufficient accuracy to determine the Hubble constant from the time-delay. LensCLEAN is the best method to exploit extended lensed sources as modelling constraints. It is especially well suited to determine the radial mass distribution of lens galaxies, both for cosmological applications and to study the lenses themselves.


For more details, have a look at my PhD thesis and Paper I and Paper II on the subject.



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