Reference : A search for gravitational lensing among highly luminous quasars - New results
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/25386
A search for gravitational lensing among highly luminous quasars - New results
English
Magain, Pierre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Remy, M. [ > > ]
Surdej, Jean mailto [Université de Liège - ULg > 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]
1990
Gravitational Lensing
Mellier, Y.
Fort, B.
Soucail, G.
Springer-Verlag
Lecture Notes in Physics 360
360
88-92
No
Yes
International
3-540-52648-X
Berlin Heidelberg
Germany
"Gravitational lensing"
Sept. 13-15, 1989
Y. Mellier, B. Fort, G. Soucail (eds.)
Toulouse
France
[en] GRAVITATIONAL LENSES ; QUASARS ; SKY SURVEYS (ASTRONOMY) ; DATA SAMPLING ; IMAGE PROCESSING ; LUMINOSITY ; POINT SPREAD FUNCTIONS ; VISIBLE SPECTRUM
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/25386
http://adsabs.harvard.edu/abs/1990LNP...360...88M
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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