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A search for gravitational lensing among highly luminous quasars - New results
Magain, Pierre; Remy, M.; Surdej, Jean et al.
1990In Mellier, Y.; Fort, B.; Soucail, G. (Eds.) Gravitational Lensing
 

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Original publication: "Lecture notes in physics: Gravitational lensing"; Proceedings of the Workshop, Toulouse, France, Sept. 13-15, 1989 (A91-39303 16-90). Y. Mellier, B. Fort, G. Soucail (eds.)


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Keywords :
GRAVITATIONAL LENSES; QUASARS; SKY SURVEYS (ASTRONOMY); DATA SAMPLING; IMAGE PROCESSING; LUMINOSITY; POINT SPREAD FUNCTIONS; VISIBLE SPECTRUM
Abstract :
[en] Images of highly luminous QSOs are analyzed to determine whether the gravitational magnification of the background QSO by matter associated with the foreground galaxies accounts for the excess of galaxies in the fields of distant QSOs. Galaxy detection is increased by utilizing red-filter images, 40 taken with the EFOSC at the ESO 3.6-m telescope and 43 taken with a direct CCD camera at the ESO/MPI 2.2-m telescope. The R-magnitude ranges from 22.5 to 23.0 for the sample, for which the number of galaxies is counted by eye, showing 45 galaxies of radio and optical type. The overdensity found is not as pronounced as that of Fugmann (1988) or that of Webster et al. (1988). A systematic subtraction of the point spread function is also described to investigate the idea that some galaxies responsible for the QSO light magnification are within the inner 3-arcsec circle. The galaxies very close to the line-of-sight are theorized to contribute significantly to the magnification of these QSOs.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Remy, M.
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Swings, J.-P. ;  Liege, Institut d'Astrophysique, Belgium
Smette, A.;  European Southern Observatory, Garching, Federal Republic of Germany
Language :
English
Title :
A search for gravitational lensing among highly luminous quasars - New results
Publication date :
1990
Event name :
"Gravitational lensing"
Event organizer :
Y. Mellier, B. Fort, G. Soucail (eds.)
Event place :
Toulouse, France
Event date :
Sept. 13-15, 1989
By request :
Yes
Audience :
International
Main work title :
Gravitational Lensing
Editor :
Mellier, Y.
Fort, B.
Soucail, G.
Publisher :
Springer-Verlag, Berlin Heidelberg, Germany
ISBN/EAN :
3-540-52648-X
Collection name :
Lecture Notes in Physics 360
Pages :
88-92
Available on ORBi :
since 11 October 2009

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