Results 11 to 20 of about 775,307 (358)
The Astrophysical Journal, 2000 The analysis of the shear induced by a single cluster on the images of a large number of background galaxies is all centered around the curl-free character of a well-known vector field that can be derived from the data.
Crawford C. S. +11 more
core +3 more sources
Gravitational Lensing by Spherical Lenses [PDF]
International Journal of Astronomy and Astrophysics, 2014 In this work we introduced a new proposal to study the gravitational lensing theory by spherical lenses, starting from its surface mass density $ (x)$ written in terms of a decreasing function $f$ of a dimensionless coordinate $x$ on the lens plane.
Roger Hurtado +2 more
openaire +4 more sources
THE M31 PIXEL LENSING PLAN CAMPAIGN: MACHO LENSING AND SELF-LENSING SIGNALS [PDF]
The Astrophysical Journal, 2014 We present the final analysis of the observational campaign carried out by the PLAN (Pixel Lensing Andromeda) collaboration to detect a dark matter signal in form of MACHOs through the microlensing effect. The campaign consists of about 1 month/year observations carried out during 4 years (2007-2010) at the 1.5m Cassini telescope in Loiano ...
Francesco Strafella +18 more
openaire +8 more sources
Gradient Index Metasurface Lens for Microwave Imaging
Sensors, 2022 This paper presents the design, simulation and experimental validation of a gradient-index (GRIN) metasurface lens operating at 8 GHz for microwave imaging applications. The unit cell of the metasurface consists of an electric-LC (ELC) resonator.
Srijan Datta +2 more
doaj +1 more source
Is There a Quad Problem among Optical Gravitational Lenses? [PDF]
, 2007 Most of optical gravitational lenses recently discovered in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) have two-images rather than four-images, in marked contrast to radio lenses for which the fraction of four-image lenses (quad fraction) is ...
Oguri, Masamune
core +2 more sources
Liquid Crystal Devices for Beam Steering Applications
Micromachines, 2021 Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented.
Rowan Morris +2 more
doaj +1 more source
RESEARCH MARKETING TOOLS, WHICH IMPROVE THE LIFE OF PEOPLE WITH DISABILITIES [PDF]
, 2002 Parabolic refractive X-ray lenses are optical components, especially suitable for third-generation synchrotron radiation sources. This article describes the status of the development of our lenses and illustrates the possibilities for micrometre and ...
Benner, Boris +7 more
core +2 more sources
Strong lensing, cosmology and lensing halos [PDF]
Journal of Cosmology and Astroparticle Physics, 2006 With future wide and deep cosmological sky surveys, a large number of gravitationally lensed, multiply imaged systems will be found. In addition to multiply imaged galaxies and quasars, sources will include transient events like supernovae and gamma ray bursts in which case very accurate time delay measurements are possible.
Edvard Mörtsell, Christoffer Sunesson
openaire +3 more sources
The Environments of SLACS Gravitational Lenses [PDF]
, 2007 We report on an investigation of the environments of the SLACS sample of gravitational lenses. The local and global environments of the lenses are characterized using SDSS photometry and, when available, spectroscopy.
Auger, M. W.
core +1 more source
Imaging with Pairs of Skew Lenses [PDF]
, 2017 Many of the properties of thick lenses can be understood by considering these as a combination of parallel ideal thin lenses that share a common optical axis. A similar analysis can also be applied to many other optical systems.
Belin, Jakub +3 more
core +1 more source