Is JVAS B0218+357 a Golden Lens?

Talk given in the research seminar of the astrophysics group at the physics department of Potsdam university on 8. May 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

I discuss the special properties of the lens B0218+357, which make this system unique among all time-delay lenses. The observational constraints that are available do potentially allow the determination of the Hubble constant with very high accuracy. The only problem is the small size of this system, which makes direkt measurements of the lens position very difficult. This problem was finally solved by applying the LensCLEAN method to determine this important parameter indirectly. I present a value for H0 using isothermal models and preliminary modelling results for the radial mass slope using new VLBI data. To say it quickly, the answer is a cautious "yes".

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



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Script last modified on 7 Sep 2010
Last change to this data base entry on 20 Nov 2002