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The Clover Leaf Quasar H1413+117: New Photometric Light Curves

Published online by Cambridge University Press:  25 May 2016

M. Remy ,
E. Gosset ,
D. Hutsemékers ,
B. Revenaz  and
J. Surdej
M. Remy
Affiliation:
Institut d'Astrophysique, Liège, Belgium
E. Gosset
Affiliation:
Institut d'Astrophysique, Liège, Belgium Chercheur Qualifié au FNRS, Belgium
D. Hutsemékers
Affiliation:
Institut d'Astrophysique, Liège, Belgium Chercheur Qualifié au FNRS, Belgium
B. Revenaz
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA
J. Surdej
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA Directeur de Recherches au FNRS, Belgium

Abstract

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Direct CCD images of the gravitationally lensed BAL quasar H1413+117 (Bessel B, V, R, I; Gunn r and i), obtained during 1989-1994 in the framework of photometric monitorings at ESO and with the NOT, have been carefully (re-)analyzed. Simultaneous fitting of 4 PSFs, fixing the relative positions of components B, C and D with respect to A, has been achieved successfully. The relative light curves of the 4 lensed QSO images, with respect to a stable nearby comparison star, confirm the general trend already presented by Arnould et al. (1993). The amplitude of the light curves is found to be about 0.5 magnitude, peak-to-peak in the V filter. The four lensed components display brightness variations quasi-simultaneously and in parallel. In addition to these intrinsic light variations due to the source, we find that component D shows extra light variations with respect to the other components. These are very likely caused by micro-lensing.

Type
Chapter 8: Quasar Structure & Microlensing
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 261 - 262
Copyright
Copyright © Kluwer 1996 

References

Angonin, M.-C., et al., 1990, A&A, 223, L5 Google Scholar
Arnould, P., et al., 1993, in Gravitational Lenses in the Universe, eds. Surdej, J. et al., (Liège: Université de Liège) 169 Google Scholar