Results 11 to 20 of about 33,635 (203)
Cosmic Shear from Galaxy Spins [PDF]
The Astrophysical Journal, 2000 We discuss the origin of galactic angular momentum, and the statistics of the present day spin distribution. It is expected that the galaxy spin axes are correlated with the intermediate principal axis of the gravitational shear tensor.
Catelan P. +3 more
core +5 more sources
EAS Publications Series, 2008 Cosmic shear offers a remarkbly clean way to measure the equation of state of the Universe and its evolution. Resolution over a wide field is paramount, and Antarctica offers unique possibilities in this respect.
Saunders, W.
core +2 more sources
Non-parametric Cosmology with Cosmic Shear [PDF]
Physical Review D, 2019 We present a method to measure the growth of structure and the background geometry of the Universe -- with no a priori assumption about the underlying cosmological model.
Kitching, Thomas D. +2 more
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Hierarchical Cosmic Shear Power Spectrum Inference [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 We develop a Bayesian hierarchical modelling approach for cosmic shear power spectrum inference, jointly sampling from the posterior distribution of the cosmic shear field and its (tomographic) power spectra.
Alsing, Justin +5 more
core +7 more sources
Cosmic Shear Systematics: Software-Hardware Balance [PDF]
, 2009 Cosmic shear measurements rely on our ability to measure and correct the Point Spread Function (PSF) of the observations. This PSF is measured using stars in the field, which give a noisy measure at random points in the field.
Amara, A. +2 more
core +3 more sources
Cosmic Shear with Einstein Rings [PDF]
The Astrophysical Journal Letters, 2017 We explore a new technique to measure cosmic shear using Einstein rings. In Birrer et al. (2017), we showed that the detailed modelling of Einstein rings can be used to measure external shear to high precision. In this letter, we explore how a collection
Amara, Adam +2 more
core +2 more sources
3D Photometric Cosmic Shear [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 Here we present a number of improvements to weak lensing 3D power spectrum analysis, 3D cosmic shear, that uses the shape and redshift information of every galaxy to constrain cosmological parameters. We show how photometric redshift probability distributions for individual galaxies can be directly included in this statistic with no averaging.
Kitching, T, Heavens, A, Miller, L
openaire +4 more sources
Comparing cosmic shear measures [PDF]
Astronomy & Astrophysics, 2008 We introduce an optimized data vector of cosmic shear measures (N). This data vector has high information content, is not sensitive against B-mode contamination and only shows small correlation between data points of different angular scales. We show that a data vector of the two-point correlation function (2PCF) in general contains more information on
Eifler, T., Kilbinger, M., Schneider, P.
openaire +2 more sources
LENSING BIAS IN COSMIC SHEAR [PDF]
The Astrophysical Journal, 2009 Only galaxies bright enough and large enough to be unambiguously identified and measured are included in galaxy surveys used to estimate cosmic shear. We demonstrate that because gravitational lensing can scatter galaxies across the brightness and size thresholds, cosmic shear experiments suffer from lensing bias.
Schmidt, Fabian +4 more
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Cosmic shear statistics and cosmology [PDF]
Astronomy & Astrophysics, 2001 We report a measurement of cosmic shear correlations using an effective area of 6.5 sq. deg. of the VIRMOS deep imaging survey in progress at the Canada-France-Hawaii Telescope. We measured various shear correlation functions, the aperture mass statistic and the top-hat smoothed variance of the shear with a detection significance exceeding 12 sigma for
van Waerbeke, L. +13 more
openaire +5 more sources