Cluster strong lensing: a new strategy for testing cosmology with simulations
نویسندگان
چکیده
منابع مشابه
Cosmography with cluster strong lensing
By stacking an ensemble of strong lensing clusters, we demonstrate the feasibility of placing constraints on the dark energy equation of state. This is achieved by using multiple images of sources at two or more distinct redshift planes. The sample of smooth clusters in our simulations is based on observations of massive clusters and the distribution of background galaxies is constructed using ...
متن کاملSimulations of Strong Gravitational Lensing with Substructure
Galactic sized gravitational lenses are simulated by combining a cosmological N-body simulation and models for the baryonic component of the galaxy. The lens caustics, critical curves, image locations and magnification ratios are calculated by ray-shooting on an adaptive grid. It is found that the simulations do not cause the observed number of violations of the cusp caustic magnification relat...
متن کاملCluster Cores, Gravitational Lensing, and Cosmology
Many multiply{imaged quasars have been found over the years, but none so far with image separation in excess of 8 00. The absence of such large splittings has been used as a test of cosmological models: the standard Cold Dark Matter model has been excluded on the basis that it predicts far too many large{separation double images. These studies assume that the lensing structure has the mass proo...
متن کاملCluster Strong Lensing Constraints on Dark Energy
Cluster strong lensing can be used to obtain constraints on cosmological parameters, in particular as we show here, the dark energy equation of state. This is achieved by using multiple images of sources at two or more distinct redshift planes. Utilizing many families of multiply imaged sources we obtain purely geometric constraints on dark energy that are largely independent of the properties ...
متن کاملCosmology with weak lensing surveys.
Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening mass. Since the lensing effects arise from deflections of the light rays due to fluctuations of the gravitational potential, they can be directly related to the underlying density field of the large-scale structures. Weak gravitational surveys ar...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2014
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921314010916