Bundle method for calculating weak magnification by gravitational lenses
نویسنده
چکیده
We present here an alternative method for calculating magnifications in gravitational lensing calculations – the Ray Bundle method. We provide a detailed comparison between the distribution of magnifications obtained compared with analytic results and conventional ray-shooting methods. The Ray Bundle method provides high accuracy in the weak lensing limit, and is computationally much faster than (non-hierarchical) ray shooting methods to a comparable accuracy. The Ray Bundle method is a powerful and efficient technique with which to study gravitational lensing within realistic cosmological models, particularly in the weak lensing limit.
منابع مشابه
A robust and efficient method for calculating the magnification of extended sources caused by gravitational lenses
To determine the magnification of an extended source caused by gravitational lensing one has to perform a two-dimensional integral over point-source magnifications in general. Since the point-source magnification jumps to an infinite value on caustics, special care is required. For a uniformly bright source, it has been shown earlier that the calculation simplifies if one determines the magnifi...
متن کاملLetter to the Editor A robust and efficient method for calculating the magnification of extended sources caused by gravitational lenses
To determine the magnification of an extended source caused by gravitational lensing one has to perform a two-dimensional integral over point-source magnifications in general. Since the point-source magnification jumps to an infinite value on caustics, special care is required. For a uniformly bright source, it has been shown earlier that the calculation simplifies if one determines the magnifi...
متن کاملStatistics of Gravitational Microlensing Magnification. I. Two-dimensional Lens Distribution
The propagation of light of distant sources through a distribution of clumpy matter, acting as point mass lenses, produces multiple images that contribute to the total brightness of the observed macroimages. In this paper we refine the theory of gravitational microlensing for a planar distribution of point masses. In the second accompanying paper, we extend the analysis to a three-dimensional l...
متن کاملGravitational Lensing in Inhomogeneous Universes
I describe a new approach (developed in collaboration with D.E. Holz) to calculating the statistical distributions for magnification, shear, and rotation of images of cosmological sources due to gravitational lensing by mass inhomogeneities on galactic and smaller scales. Our approach is somewhat similar to that used in “Swiss cheese” models, but the “cheese” has been completely eliminated, the...
متن کاملStrong biases in infrared-selected gravitational lenses
Bright submillimetre-selected galaxies have been found to be a rich source of strong gravitational lenses. However, strong gravitational lensing of extended sources leads inevitably to differential magnification. In this paper I quantify the effect of differential magnification on simulated far-infrared and submillimetre surveys of strong gravitational lenses, using a foreground population of N...
متن کامل