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Gravitational Lensing Of Quasar 0957+561 And The Determination Of H0

Published online by Cambridge University Press:  25 May 2016

George Rhee ,
Gary Bernstein ,
Tony Tyson  and
Phil Fischer
George Rhee
Affiliation:
Department of Physics, University of Nevada, Las Vegas
Gary Bernstein
Affiliation:
Department of Astronomy, University of Michigan
Tony Tyson
Affiliation:
AT&T Bell Labs
Phil Fischer
Affiliation:
AT&T Bell Labs

Extract

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The double quasar 0957+561 was the first discovered instance of multiple imaging via gravitational lensing. The galaxy cluster is an important deflector as well as the first ranked galaxy. This has so far precluded construction of a unique model of the lens, reducing the accuracy of the derived H0 value. We have obtained deep images of the system at CFHT. The cluster is sufficiently massive to cause distortions on distant background galaxy images. We have used a mass map derived from lensing distortions to improve the accuracy of the cluster center location and place new limits on H0.

Type
Chapter 2: The Hubble Constant & Time Delays
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 49 - 50
Copyright
Copyright © Kluwer 1996 

References

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