A gravitational lensing determination of the Hubble constant using radio data

Talk given for the astrophysics group at the physics department of Potsdam university on 20. September 2001

O. Wucknitz [1,2]

  1. Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK
  2. Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

Abstract

I give an overview of one aspect of cosmological applications of gravitational lenses and the possible problems that lens model degeneracies can cause. The LensCLEAN algorithm, using radio data, can help in reducing systematic uncertainties. After a brief introduction to radio interferometry, I discuss the algorithm as well as results for the Hubble constant from time delay measurements of the lens system JVAS B0218+357.

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



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gzipped postscript file (6.1 MB, last change 25 Sep 2001)
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PDF file (2.5 MB, last change 19 Sep 2001)
37 pages, suitable for presentation with acroread. This version also includes some hyperlinks for quick navigation.


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