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The VLA Light Curves of 0957+561, 1979-1994

Published online by Cambridge University Press:  25 May 2016

D. B. Haarsma ,
J. N. Hewitt ,
B. F. Burke  and
J. Lehár
D. B. Haarsma
Affiliation:
Massachusetts Institute of Technology
J. N. Hewitt
Affiliation:
Massachusetts Institute of Technology
B. F. Burke
Affiliation:
Massachusetts Institute of Technology
J. Lehár
Affiliation:
Harvard-Smithsonian Center for Astrophysics

Abstract

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The gravitational lens 0957+561 has been monitored by our group for 16 years, using the VLA at 5 GHz. Since our last report in 1992, both images have returned to their quiescent flux levels, and the A image has brightened again. We apply various analysis methods to the light curves, and obtain a preliminary estimate of τ = 455 ± 40 days for the time delay.

Type
Chapter 2: The Hubble Constant & Time Delays
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 43 - 44
Copyright
Copyright © Kluwer 1996 

References

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