The anatomy of a quadruply imaged gravitational lens system
- Creators
- Suyu, S. H.
- Blandford, R. D.
Abstract
The key to using a strong gravitational lens system to measure the Hubble constant is to obtain an accurate model of the lens potential. In this paper, we investigate the properties of gravitational lens B1608+656, a quadruply imaged lens system with an extended source intensity distribution. Our analysis is valid for generic quadruply lensed systems. Limit curves and isophotal separatrices are defined for such systems, and we show that the isophotal separatrices must intersect at the critical curves and the satellite isophotes must be tangent to the limit curves. The most recent model of B1608+656 by Koopmans et al. satisfies these criteria for some, but not all, of the isophotal separatrices within the observational uncertainty. We study a non-parametric method of potential reconstruction proposed by Blandford, Surpi & Kundic and demonstrate that although the method works in principle and elucidates image formation, the initial potential only converges to the true model when it is within ∼1 per cent of the true model.
Additional Information
© 2005 The Authors. Journal compilation © 2005 RAS. Accepted 2005 November 9. Received 2005 October 19; in original form 2005 June 27. We thank C. Fassnacht, L. Koopmans, P. Marshall, T. Kundic, G. Surpi and T. Treu for useful discussions and encouragement. We thank the referee for comments that improved the presentation of the paper. SS thanks I. Mandel for commenting on the manuscript. This work was supported by the NSF under award no AST04-44059 and in part by the US Department of Energy under contract number DE-AC02-76SF00515. SS acknowledges the support of the NSERC (Canada) through the Postgraduate Scholarship.Attached Files
Published - 366-1-39.pdf
Accepted Version - 0506629
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Additional details
- Eprint ID
- 95740
- Resolver ID
- CaltechAUTHORS:20190523-125437208
- AST 04-44059
- NASA
- DE-AC02-76SF00515
- Department of Energy (DOE)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Created
-
2019-05-23Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- TAPIR