Combining size and shape in weak lensing
نویسندگان
چکیده
منابع مشابه
Weak Lensing
In the preceding chapters, the effects of lensing were so strong as to leave an unmistakable imprint on a specific source, allowing a detailed treatment. However, only the densest regions of the universe are able to provide such a spectacular lensing effect. To study more representative regions of the universe, we must examine large numbers of sources statistically. This is the domain of weak l...
متن کاملWeak lensing and cosmology
Recently, it has been shown that it is possible to reconstruct the projected mass distribution of a cluster from weak lensing provided that both the geometry of the universe and the probability distribution of galaxy redshifts are known; actually, when additional photometric data are taken to be available, the galaxy redshift distribution could be determined jointly with the cluster mass from t...
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We explore the dependence of weak lensing phenomena on the background cosmology. We rst generalise the relation between P (!), the angular power spectrum of the distortion, and the power spectrum of density uctuations to nonat cosmologies. We then compute P for various illustrative models. A useful cosmological discriminator is the growth of P with source redshift which is much stronger in low ...
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Weak gravitational lensing can be used to investigate both dark matter and dark energy but requires accurate measurements of the shapes of faint, distant galaxies. Such measurements are hindered by the finite resolution and pixel scale of digital cameras. We investigate the optimum choice of pixel scale for a spacebased mission, using the engineering model and survey strategy of the proposed Su...
متن کاملWeak lensing and dark energy
We study the power of upcoming weak lensing surveys to probe dark energy. Dark energy modifies the distance-redshift relation as well as the matter power spectrum, both of which affect the weak lensing convergence power spectrum. Some dark-energy models predict additional clustering on very large scales, but this probably cannot be detected by weak lensing alone due to cosmic variance. With rea...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2013
ISSN: 1745-3933,1745-3925
DOI: 10.1093/mnrasl/slt045