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Photometric Monitoring Of The Lensed QSO 0957+561

Published online by Cambridge University Press:  25 May 2016

D. Sinachopoulos ,
M. Burger ,
E. van Dessel ,
M. Geffert ,
M. Thibor ,
J. Colin  and
Ch. Ducourant
D. Sinachopoulos
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, B - 1180 Brussels, Belgium
M. Burger
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, B - 1180 Brussels, Belgium
E. van Dessel
Affiliation:
Royal Observatory of Belgium, Ringlaan 3, B - 1180 Brussels, Belgium
M. Geffert
Affiliation:
Sternwarte der Univ. Bonn, Auf dem Hügel 71, D - 53121 Bonn, Germany
M. Thibor
Affiliation:
Sternwarte der Univ. Bonn, Auf dem Hügel 71, D - 53121 Bonn, Germany
J. Colin
Affiliation:
Observatoire de Bordeaux, BP 89 - 33270 Floirac, France
Ch. Ducourant
Affiliation:
Observatoire de Bordeaux, BP 89 - 33270 Floirac, France

Extract

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We present our first results of a photometric monitoring project of the twin quasar 0957+561. This project aims mainly at the improvement of the determination of the time delay ΔT(A,B) for this gravitational lens, since the “time delay controversy on QSO 0957+561 (is) not yet decided” (Pelt et al. 1994). In addition, the quite large field of the CCD used allows also a long-term astrometric and photometric study of stars and galaxies in the field within a radius of about 10 arcminutes around the lens.

Type
Chapter 2: The Hubble Constant & Time Delays
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 53 - 54
Copyright
Copyright © Kluwer 1996 

References

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