How can B0218+357 be isothermal ?

Poster presented at the conference Applications Of Gravitational Lensing: Unique Insights Into Galaxy Formation And Evolution at the Kavli Institute for Theoretical Physics in Santa Barbara, 3-6 October 2006

O. Wucknitz [1]

  1. Joint Institute for VLBI in Europe, The Netherlands

Abstract

Substructure of the two images in B0218+357 resolved by VLBI provides accurate constraints on the radial mass profile of the lensing galaxy. Best fitting power-law models are close to isothermal but slightly shallower. The images probe the central parts of the face-on spiral lensing galaxy, where the mass density is expected to be dominated by luminous matter. We discuss how more realistic non-isothermal mass distributions can be consistent with these results. One aspect of this work is a comparison of deflection angles with rotation curves.



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