Results 31 to 40 of about 69,883 (320)
GRAVITATIONAL LENS CANDIDATES IN THE E-CDFS [PDF]
The Astrophysical Journal, 2011 We report ten lens candidates in the E-CDFS from the GEMS survey. Nine of the systems are new detections and only one of the candidates is a known lens system. For the most promising five systems including the known lens system, we present results from preliminary lens mass modelling, which tests if the candidates are plausible lens systems ...
Surhud More +7 more
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Discovery of a Probable Gravitational Lens [PDF]
Symposium - International Astronomical Union, 1989 We report the discovery of a new probable gravitational lens system, associated with the quasar UM 425 = 1120+019, at z = 1.465. The optical image of the system consists of 4 or more components. The two well-observed brightest components have very similar spectra. The difference of the two spectra (scaled appropriately) is consistent with a spectrum of
Meylan, G., Djorgovski, S.
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Defocusing gravitational microlensing [PDF]
, 1996 We introduce the notion of defocusing gravitational lens considering a MACHO located behind a light source with respect to an observer. The consequence of defocusing effect is a temporal variability of star luminosity which produces a gap instead of a ...
A A Marino +22 more
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A VLA Gravitational Lens Survey [PDF]
Symposium - International Astronomical Union, 1987 Gravitational lens surveys are of cosmological interest because they provide a way to measure the gravitational field of both luminous and dark matter. Many of the other methods used to detect the presence of dark matter, such as studies of galaxy rotation curves and cluster dynamics, require that there be luminous objects in the gravitational field ...
James E. Gunn +6 more
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Using gravitational lenses to detect gravitational waves [PDF]
, 1990 Gravitational lenses could be used to detect gravitational waves, because a gravitational wave affects the travel-time of a light ray. In a gravitational lens, this effect produces time-delays between the different images.
Allen, B.
core +2 more sources
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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Scattering of Gravitational Waves by the Weak Gravitational Fields of Lens Objects
, 2005 We consider the scattering of the gravitational waves by the weak gravitational fields of lens objects. We obtain the scattered gravitational waveform by treating the gravitational potential of the lens to first order, i.e.
Bartelmann +13 more
core +1 more source
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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The Astrophysical Journal, 2022 We present new light curves for the four bright images of the five image cluster-lensed quasar gravitational lens system SDSS J1004+4112. The light curves span 14.5 yr and allow the measurement of the time delay between the trailing bright quasar image D
J. A. Muñoz +5 more
doaj +1 more source
‘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
openaire +3 more sources