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Foreground Galaxies around Luminous Quasars

Published online by Cambridge University Press:  25 May 2016

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

Extract

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We compare galaxy counts in deep R-band exposures of the fields of 36 highly luminous, high redshift QSOs to those in control fields at a distance of 1 deg. We find indication for a weak overdensity of galaxies in the foreground of QSOs on scales of arcminutes on a low significance level. Counts inside rings around the quasars, stars in the quasar fields and stars in the control fields show evidence for an excess of galaxies on scales of several arcseconds around the quasars as well as for a stronger clustering of galaxies in the QSO fields than in the control fields. We interpret this in terms of an amplification bias by gravitational lensing.

Type
Part II: Contributed Papers
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 501 - 502
Copyright
Copyright © Kluwer 1996