Results 11 to 20 of about 50 (49)
Discovery of a new gravitational lens [PDF]
The Astrophysical Journal, 1984 On a trouve que le QSO double, faible 1635+267 A, B est pratiquement au meme deplacement vers le rouge z=1,961±0,003. La difference des deplacements vers le rouge, determinee par une technique de correlation croisee est de (3,2±8,5)×10 −4 , correspondant a une difference de vitesses de (33±86) kms −1 seulement. Cette faible valeur et la similitude des
Djorgovski, S., Spinrad, H.
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GRAVITATIONAL LENS MODELING WITH BASIS SETS [PDF]
The Astrophysical Journal, 2015 14 pages, 10 figures, accepted for publication in ...
Simon Birrer +2 more
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‘Missing image’ in gravitational lens systems? [PDF]
Nature, 1986 The gravitational lens models involving extended mass distribution generally predict an odd number of images with one of the images close to the centre of the principal lensing galaxy. In all the observed lens systems only an even number of images have been unambigously detected so far.
S. M. Chitre +2 more
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Self-consistent gravitational lens reconstruction [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 We present a new method for directly determining accurate, self-consistent cluster lens mass and shear maps in the strong lensing regime from the magnification bias of background galaxies. The method relies upon pixellisation of the surface mass density distribution which allows us to write down a simple, solvable set of equations.
Andy Taylor, Simon Dye
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Gravitational lens interference
The Astrophysical Journal, 1991 The consequence of the existence, when a lens is present, of two propagation paths from a source to the observer is investigated. Attention is focused on quasars as background sources; however, the results received are general and apply to pulsars and stellar sources as well. 12 refs.
Toby Falk, J. B. Peterson
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CTQ 414: A New Gravitational Lens [PDF]
The Astronomical Journal, 1999 Latex, 18 pages including 2 ps figures; accepted for publication in ...
Morgan, Nicholas D. +4 more
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Galaxy mergers and gravitational lens statistics [PDF]
The Astrophysical Journal, 1994 We investigate the impact of hierarchical galaxy merging on the statistics of gravitational lensing of distant sources. Since no definite theoretical predictions for the merging history of luminous galaxies exist, we adopt a parametrized prescription, which allows us to adjust the expected number of pieces comprising a typical present galaxy at z=0.65.
Hans-Walter Rix +3 more
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The quadrupole gravitational lens
The Astrophysical Journal, 1987 An asymmetric lens made of a spherically symmetric galaxy and a quadrupole tidal part allows a very simple pictorial examination of the multiplicity and positions of the images, for any mass density profile. The lens equations can be reduced to one equation in one variable.
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Separability of rotational effects on a gravitational lens
Physical Review D, 2003 12 pages (RevTeX); accepted for publication in Phys.
Hideki Asada +2 more
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Magnetised black hole as a gravitational lens [PDF]
Physics Letters B, 2007 5 pages, 2 figures, to be published in Phys. Lett.
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