Results 101 to 110 of about 33,635 (203)

Cosmic Shear with the CFHT

, 2000
We present results of our cosmic shear survey in progress at the Canada- France-Hawaii Telescope (CFHT). We analysed 1.7 sq. degrees of data, out of which we measured a significant correlation of galaxy shape-orientation over several arcmin scale. We present measurements of the variance of the shear $$ and of the correlation functions $$, $$.
van Waerbeke, L., Mellier, Y., Erben, T., Cuillandre, J. -C., Bernardeau, F., Maoli, R., Bertin, E., Cracken, H. J. Mc, Fevre, O. Le, Fort, B., Fort, M. Dantel-Fort, Jain, B., Schneider, P.   +12 more
openaire   +2 more sources

Accuracy requirements on intrinsic alignments for Stage-IV cosmic shear

The Open Journal of Astrophysics
In the context of cosmological weak lensing studies, intrinsic alignments (IAs) are one of the most In the context of cosmological weak lensing studies, intrinsic alignments (IAs) are one of the most complicated astrophysical systematic\rev{s} to model,
Anya Paopiamsap, Natalia Porqueres, David Alonso, Joachim Harnois-Deraps, C. Danielle Leonard   +4 more
doaj   +1 more source

Cosmic shear without shape noise

, 2013
We describe a new method for reducing the shape noise in weak lensing measurements by an order of magnitude. Our method relies on spectroscopic measurements of disk galaxy rotation and makes use of the Tully-Fisher relation in order to control for the intrinsic orientations of galaxy disks. For this new proposed method, so-called Kinematic Lensing (KL),
Huff, Eric M., Krause, Elisabeth, Eifler, Tim, Fang, Xiao, George, Matthew R., Schlegel, David   +5 more
openaire   +2 more sources

Measuring neutrino masses with a future galaxy survey

, 2012
We perform a detailed forecast on how well a Euclid-like photometric galaxy and cosmic shear survey will be able to constrain the absolute neutrino mass scale.
A. Refregier, A.P. Hearin, D. Kirk, Dark Energy Survey collaboration, H. Zhan, J. Blazek, J. Hamann, J. Hamann, Jan Hamann, K.N. Abazajian ., L. Perotto, LSST Science, N. Kaiser, Planck collaboration, R. Jiménez, R. Laureijs ., R. Massey ., R.A. Croft, S. Bridle ., S. Hannestad, S. Hannestad, S. Hannestad, S. Hilbert, S. Ho ., S. Riemer-Sorensen, SDSS collaboration, Steen Hannestad, T. Namikawa, Virgo Consortium, W. Hu, WMAP collaboration, X. Wang ., Yvonne Y.Y Wong, Z.-M. Ma   +33 more
core   +1 more source

Large-Scale Cosmic Shear Measurements

, 2000
submitted to ApJ ...
Kaiser, Nick, Wilson, Gillian, Luppino, Gerard A.   +2 more
openaire   +2 more sources

Comparing cosmic shear nulling methods for Stage-IV surveys

The Open Journal of Astrophysics
We present an analysis comparing nulling strategies for reducing the impact of baryon feedback on cosmic shear measurements. We consider three different approaches which aim to `null' the high-$k$ modes using transformations applied to the data vector ...
Naomi Clare Robertson, Alex Hall
doaj   +1 more source

Constraints on higher-dimensional gravity from the cosmic shear three-point correlation function

, 2004
With the developments of large galaxy surveys or cosmic shear surveys it is now possible to map the dark matter distribution at truly cosmological scales.
Bernardeau, Francis
core   +1 more source

Diagnosing multiplicative error by lensing magnification of type Ia supernovae

, 2015
Weak lensing causes spatially coherent fluctuations in flux of type Ia supernovae (SNe Ia). This lensing magnification allows for weak lensing measurement independent of cosmic shear.
Zhang, Pengjie
core   +1 more source

Exploring Joint Observation of the CSST Shear and Clustering of Astrophysical Gravitational Wave Source Measurements

The Astrophysical Journal
We present a comprehensive forecast for cosmological constraints using the joint observation of the cosmic shear signal from the Chinese Space Station Survey Telescope (CSST) and the clustering signal from the next-generation gravitational wave (GW ...
Pengfei Su, Yan Gong, Qi Xiong, Dingao Hu, Hengjie Lin, Furen Deng, Xuelei Chen   +6 more
doaj   +1 more source

Tomographic weak lensing shear spectra from large N-body and hydrodynamical simulations

, 2012
Forthcoming experiments will enable us to determine tomographic shear spectra at a high precision level. Most predictions about them have until now been biased on algorithms yielding the expected linear and non-linear spectrum of density fluctuations ...
Amara, Bernstein, Borgani, Casarini, Casarini, Casarini, Duffy, Fedeli, Fu, G. La Vacca, G. Murante, Gnedin, Hearin, Heitmann, Hilbert, Hoekstra, Hu, Hu, Jenkins, Jing, K. Dolag, Komatsu, Kravtsov, L. Casarini, L. Tornatore, M. Mezzetti, Massey, Rudd, S. A. Bonometto, S. Borgani, Schrabback, Sellwood, Semboloni, Seo, Smith, Springel, Springel, Sutherland, Tornatore, Van Daalen, Viel, Wadsley   +41 more
core   +1 more source