Results 61 to 70 of about 70,851 (245)

Shape, shear & flexion: An analytic flexion formalism for realistic mass profiles [PDF]

, 2009
Flexion is a non-linear gravitational lensing effect that arises from gradients in the convergence and shear across an image. We derive a formalism that describes non-linear gravitational lensing by a circularly symmetric lens in the thin-lens ...
Athreya, Bacon, Bartelmann, Binney, C. J. Fluke, Caon, Cardone, Carlberg, Ciotti, Czoske, Côté, Dye, Einasto, Elíasdóttir, Ettori, Ferrarese, Gavazzi, Goldberg, Goldberg, Goldberg, Graham, Graham, Graham, Graham, Graham, Graham, Hansen, Hoekstra, Hoekstra, Irwin, Irwin, Irwin, Katgert, Koopmans, Lauer, Lauer, Lima Neto, Lin, Lokas, Mandelbaum, Merritt, Merritt, Munshi, Navarro, Navarro, Okabe, Okura, Okura, P. D. Lasky, Prugniel, Refregier, Refregier, Rines, Rusin, Rusin, Schneider, Schneider, Schneider, Sérsic, Treu, Treu, Trujillo, Tu, van der Marel, Wojtak, Wright   +65 more
core   +1 more source

Gravitational lensing effects of supermassive black holes in cluster environments [PDF]

, 2022
Guillaume Mahler, Priyamvada Natarajan, Mathilde Jauzac, Johan Richard   +3 more
openalex   +1 more source

CTQ 414: A New Gravitational Lens

, 1999
We report the discovery and ground based observations of the new gravitational lens CTQ 414. The source quasar lies at a redshift of z = 1.29 with a B magnitude of 17.6.
Alan Dressler, Claeskens J.-F., Joshua N. Winn, José Maza, Maza J., Nicholas D. Morgan, Paul L. Schechter, Refsdal S., Rosvick J. M.   +8 more
core   +2 more sources

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.
openaire   +1 more source

Multimodal multi-output ordinal regression for discovering gravitationally-lensed transients

Machine Learning: Science and Technology
Gravitational lenses are caused by massive astronomical objects that distort space-time, bending light. They can distort transient astrophysical events, such as supernovae (SN), which are the subject of extensive study.
Nicolò Oreste Pinciroli Vago, Piero Fraternali   +1 more
doaj   +1 more source

An Exact Universal Gravitational Lensing Equation

, 1998
We first define what we mean by gravitational lensing equations in a general space-time. A set of exact relations are then derived that can be used as the gravitational lens equations in all physical situations.
A. Einstein, Ezra T. Newman, L. Landau, L. Landau, P. Schneider, Simonetta Frittelli, Simonetta Frittelli, Thomas P. Kling, V. I Arnold, V. I Arnold, V. I. Arnold   +10 more
core   +2 more sources

The first direct detection of a gravitational micro-lens toward the Galactic bulge

, 2007
We present a direct detection of the gravitational lens that caused the microlensing event MACHO-95-BLG-37. This is the first fully resolved microlensing system involving a source in the Galactic bulge, and the second such system in general. The lens and
A. Wood, Baraffe I., Bessell M. S., Chang K., Kozlowski S., P. R. Woźniak, Perryman M. A. C., S. Kozłowski, S. Mao, Udalski A., Wozniak P.   +10 more
core   +1 more source

Lensing or luck? False alarm probabilities for gravitational lensing of gravitational waves [PDF]

, 2022
Mesut Çalışkan, José María Ezquiaga, O. A. Hannuksela, D. E. Holz   +3 more
openalex   +1 more source

Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes

The Astrophysical Journal
A moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
doaj   +1 more source

Lensing galaxies: light or dark? [PDF]

, 1998
In a recent paper, Hawkins (1997) argues on the basis of statistical studies of double-image gravitational lenses and lens candidates that a large population of dark lenses exists and that these outnumber galaxies with more normal mass-to-light ratios by
Browne, I. W. A., Fassnacht, C. D., Helbig, P., Jackson, N., Koopmans, L. V. E., Marlow, D. R., Wilkinson, P. N.   +6 more
core   +3 more sources