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Foreground Galaxies And The Variability Of Luminous Quasars

Published online by Cambridge University Press:  25 May 2016

J. von Linde ,
U. Borgeest ,
J. Schramm ,
S. Refsdal  and
E. Van Drom
J. von Linde
Affiliation:
Hamburger Sternwarte Gojenbergsweg 112, D-21029 Hamburg, Germany email: jlinde@hs.uni-hamburg.de
U. Borgeest
Affiliation:
Hamburger Sternwarte Gojenbergsweg 112, D-21029 Hamburg, Germany email: jlinde@hs.uni-hamburg.de
J. Schramm
Affiliation:
Hamburger Sternwarte Gojenbergsweg 112, D-21029 Hamburg, Germany email: jlinde@hs.uni-hamburg.de
S. Refsdal
Affiliation:
Hamburger Sternwarte Gojenbergsweg 112, D-21029 Hamburg, Germany email: jlinde@hs.uni-hamburg.de
E. Van Drom
Affiliation:
Université de Liège, Inst. d'Astrophysique, 5, Avenue de Cointe, B-4000 Liège, Belgium

Extract

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In order to look for an amplification bias (AB) by gravitational lensing caused by medium redshift (0.2≲ z ≲ 0.8) clusters or groups of galaxies, we compare galaxy counts in deep CCD images of highly luminous, high redshift QSOs with those in nearby control fields at a distance of 1 deg at the same galactic latitude. The total sample contains 37 objects up to now, from which one field had to be excluded because of a seeing difference between the QSO and control fields.

Type
Chapter 8: Quasar Structure & Microlensing
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 293 - 294
Copyright
Copyright © Kluwer 1996 

References

Borgeest, U., von Linde, J., & Refsdal, S., 1991, A&A, 251, L35 Google Scholar
Schramm, K.-J., Borgeest, U., Kühl, D., v. Linde, J., & Linnert, M.D., 1994, A&A Suppl, 106, 349 Google Scholar
Van Drom, E., Surdej, J., Magain, P., Hutsemèkers, D., Gosset, E., Claeskens, J.F., Shaver, P., & Melnick, J., 1993 in Gravitational Lenses in the Universe, eds. Surdej, J. et al., (Liège: Université de Liège) 301 Google Scholar