Results 101 to 110 of about 1,077 (214)

Computer Programming to Advance Gravitational Lensing

, 2013
The purpose of this research was to create a computer code that would numerically test a Poisson equation relating the mass distribution of a lens galaxy cluster to weak gravitational shear.
Roche, Alex
core  

Adaptive Reconstruction of Cluster Halos (ARCH): Integrating Shear and Flexion for Substructure Detection

The Astrophysical Journal
We present Adaptive Reconstruction of Cluster Halos ( ARCH ), a new gravitational lensing pipeline for cluster mass reconstruction that applies a joint shear-flexion analysis to JWST imaging.
Jacob Shpiece, David M. Goldberg
doaj   +1 more source

Gravitational Lensing Effect on Cosmic Microwave Background

, 2007
Matter distribution in the Universe can cause the gravitational lensing effect, which would contaminate the cosmic microwave background (CMB) pattern we have observed today.
Wang, Fu-Cheng, 王富正
core  

Forecast of Joint Analysis of Cosmic Shear and Supernovae Magnification from the CSST and LSST

The Astrophysical Journal
Cosmic shear and cosmic magnification reflect the same gravitational lensing field. Each of these two probes are affected by different systematics. We study the auto- and cross-correlations of cosmic shear from the China Space Survey Telescope and cosmic
Ye Cao, Bin Hu, Ji Yao, Hu Zhan
doaj   +1 more source

KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays

Astronomy & Astrophysics
Dark matter dominates the matter content of the Universe, and its properties can be constrained through large-scale structure probes such as the cross-correlation between the unresolved gamma-ray background (UGRB) and weak gravitational lensing.
Zhang Shiyang, Hildebrandt Hendrik, Yan Ziang, Tröster Tilman, Aravinthan Athithya, Asgari Marika, Bartlett Deaglan J., Bilicki Maciej, Elsässer Dominik, Heymans Catherine, Joachimi Benjamin, Moscardini Lauro, Neumann Dennis, Paopiamsap Anya, Reischke Robert, Stölzner Benjamin, Wright Angus H.   +16 more
doaj   +1 more source

Weak lensing distortions beyond shear

, 2019
International audienceWhen a luminous source is extended, its distortions by weak gravitational lensing are richer than a mere combination of magnification and shear.
Fleury, Pierre, Larena, Julien, Uzan, Jean-Philippe   +2 more
core   +1 more source

Sheer shear: weak lensing with one mode

The Open Journal of Astrophysics, 2019
3D data compression techniques can be used to determine the natural basis of radial eigenmodes that encode the maximum amount of information in a tomographic large-scale structure survey.
Emilio Bellini, Ludovic van Waerbeke, Shahab Joudaki, David Alonso   +3 more
doaj   +1 more source

Testing modified gravity theories with weak gravitational lensing [PDF]

, 2018
‘Cosmic shear’ is the weak gravitational lensing effect generated by fluctuations of the gravitational tidal fields of the large-scale structure that induce correlations in the distortion of observed galaxy shapes.
Spurio Mancini, Alessio
core   +1 more source

A Unified Photometric Redshift Calibration for Weak Lensing Surveys Using the Dark Energy Spectroscopic Instrument

The Astrophysical Journal
The effective redshift distribution n ( z ) of galaxies is a critical component in the study of weak gravitational lensing. Here, we introduce a new method for determining n ( z ) for weak lensing surveys based on high-quality redshifts and neural ...
J. U. Lange, D. Blanco, A. Leauthaud, A. H. Wright, A. Fisher, J. Ratajczak, J. Aguilar, S. Ahlen, S. Bailey, D. Bianchi, C. Blake, D. Brooks, T. Claybaugh, A. Cuceu, K. S. Dawson, A. de la Macorra, J. DeRose, Arjun Dey, P. Doel, N. Emas, S. Ferraro, A. Font-Ribera, J. E. Forero-Romero, C. Garcia-Quintero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, S. Heydenreich, H. Hildebrandt, M. Ishak, J. Jimenez, S. Joudaki, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, O. Lahav, C. Lamman, M. Landriau, L. Le Guillou, M. E. Levi, L. Medina-Varela, A. Meisner, R. Miquel, J. Moustakas, S. Nadathur, J. A. Newman, N. Palanque-Delabrouille, A. Porredon, F. Prada, I. Pérez-Ràfols, G. Rossi, R. Ruggeri, E. Sanchez, C. Saulder, D. Schlegel, M. Schubnell, D. Sprayberry, Z. Sun, G. Tarlé, B. A. Weaver, S. Yuan, P. Zarrouk, H. Zou   +63 more
doaj   +1 more source

Propagating Residual Biases in Cosmic Shear Power Spectra

The Open Journal of Astrophysics, 2019
In this paper we derive a full expression for the propagation of multiplicative and additive shape measurement biases into the cosmic shear power spectrum.
Thomas D. Kitching, Paniez Paykari, Henk Hoekstra, Mark Cropper   +3 more
doaj   +1 more source