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Time Delays in the Gravitational Lens CLASS B1608+656: Results from Second and Third Seasons of VLA Monitoring

Published online by Cambridge University Press:  26 May 2016

Christopher. Fassnacht ,
Emily. Xanthopoulos ,
David. Rusin  and
Leon. Koopmans
Christopher. Fassnacht
Affiliation:
NRAO, P.O. Box O, Socorro, NM 87801, USA
Emily. Xanthopoulos
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire, SK11 9DL, UK
David. Rusin
Affiliation:
Department of Physics and Astronomy, University of Pennsylvania, 209 S. 33rd St., Philadelphia, PA 19104, USA
Leon. Koopmans
Affiliation:
Theoretical Astrophysics, 130-33, Caltech, Pasadena, CA 91125, USA

Abstract

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The gravitational lens CLASS B1608+656 is one of the most promising lens systems for the measurement of H0 on cosmological scales. The three independent time delays between the four lensed images have been measured, and the extended lensed optical emission holds the promise for a very well-constrained model. The published time delay measurements are based on the first season of VLA monitoring, in which the background source varied by only 5% in flux density. The small level of variation leads to relatively large uncertainties in the determination of the time delays (10-20%). Two more seasons of monitoring have now been completed and the source flux density has changed by ˜25% during that time. We present the results of the continued VLA monitoring and the resulting time-delay analysis. The new data have significantly reduced the uncertainties on the time delays and, hence, reduced the uncertainties on the resulting determination of H0 from this system.

Type
Part XII: Poster Papers
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 455 - 456
Copyright
Copyright © Astronomical Society of the Pacific 2005 

References

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