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Ground-Based And HST Direct Imaging Of HLQs

Published online by Cambridge University Press:  25 May 2016

J. Surdej ,
A.O. Jaunsen ,
J.-F. Claeskens ,
S. Gonzaga ,
A. Pospieszalska-Surdej ,
B. Pirenne  and
A. Prieto
J. Surdej
Affiliation:
STScI,. 3700 San Martin Drive, Baltimore, MD 21218, USA Space Science Department of the European Space Agency, and FNRS, Belgium
A.O. Jaunsen
Affiliation:
Nordic Optical Telescope, Ap. 474, S/C de La Palma, E–38700 Canarias, Spain
J.-F. Claeskens
Affiliation:
European Southern Observatory (Chile) Aspirant au FNRS, Institut d'Astrophysique, Université de Liège, Avenue de Cointe 5, B-4000 Liège, Belgium
S. Gonzaga
Affiliation:
STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA
A. Pospieszalska-Surdej
Affiliation:
STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA
B. Pirenne
Affiliation:
ST-ECF, c/o ESO, Karl-Schwarzschild Str. 2, D-85748 Gar-ching bei München, Germany
A. Prieto
Affiliation:
MPI für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching bei München, Germany

Abstract

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In the context of our studies on gravitational lensing effects among Highly Luminous Quasars (HLQs), we are presently compiling at STScI an archive of direct CCD frames for more than 1000 bright quasars observed with HST and ground-based telescopes. This archive will soon become publicly accessible through the Internet. On the basis of these observations, we are pursuing in a systematic way the analysis (subtraction of numerical PSFs and/or deconvolution) of the HLQ images in order to detect multiple QSO images and/or nearby foreground galaxies at very small angular separations. Residual images corresponding to several new possible multiply imaged HLQs are presented here. From the observed number and image configuration of gravitational lens candidates identified in this large sample of HLQs, it is possible to infer realistic values for parameters characterizing the galaxy deflectors, the number counts of quasars, etc. (cf. Claeskens et al. 1995ab), and also to set interesting constraints on the cosmological density of compact objects in the mass range 1010 ‒ 1012M⊙.

Type
Chapter 11: Lens Surveys
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 387 - 392
Copyright
Copyright © Kluwer 1996 

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