Reducing systematic uncertainties of H0 from gravitational lensing

Poster presentation at the conference A New Era In Cosmology at the University of Durham, 11-15 September 2001

ADS bibcode 2002nec..conf..190W
astro-ph/0112330

ASP Conference Series Vol. 283 (2002)
A New Era in Cosmology
editors: N. Metcalfe and T. Shanks

O. Wucknitz [1,2]

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

Abstract

Original Poster

We discuss possible systematic errors of H0 determined using lensing time delays. Most important is the effect of the radial mass profile of the lens which can not be constrained very well in most lens systems. We present general results showing that the assumption of an incorrect profile leads to serious systematic effects in H0 which may not be detected. The lens system JVAS B0218+357 has some special properties which allow much tighter constraints than most other lenses. The importance of using systems with extended or multi-component sources is stressed and results using the LensCLEAN algorithm on radio interferometry data of JVAS B0218+357 are presented.

Proceedings version (Title: "LensCLEANing JVAS B0218+357 to determine H0")

We use the radio ring in JVAS B0218+357 to constrain the mass models with LensCLEAN. H0 is determined from the resulting model and the time delay. B0218+357 is one of the best systems to reduce systematic errors in H0 and may thus be called a "golden lens".

For more details, have a look at my PhD thesis.


ADS bibcode 2002nec..conf..190W (link to ADS entry)
proceedings version: astro-ph/0112330 (link to e-print archive)


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download Movie: residuals in the lens plane
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download Movie: residuals in the lens plane, how LensCLEAN sees them
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download Movie: building the lens plane LensCLEAN map
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download Movie: building the source plane LensCLEAN map
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Script last modified on 7 Sep 2010
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