Results 91 to 100 of about 706,236 (203)

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

The impact of higher-order distortions on the precise measurement of weak gravitational lensing shear and flexion

Monthly Notices of the Royal Astronomical Society
ABSTRACT In this paper, we investigate the impact of higher-order distortions on the precise measurement of weak gravitational lensing shear and flexion. We begin by defining$x_\mathrm{ s} = \theta /r_\mathrm{ s}$ generalized higher-order distortions and outlining methods for measuring them. Then, using several lens models, we examine
Yuki Okura, Toshifumi Futamase
openaire   +2 more sources

Probing the Evolution of Dusty Star-Forming Galaxies at the Cosmic Noon via Strong Gravitational Lensing

, 2023
The primary objective of this thesis is to explore the early stages of the evolution of Dusty Star-Forming Galaxies (DSFGs) by leveraging the physical phenomenon of strong gravitational lensing.
GIULIETTI, MARIKA
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

CMB as a Probe of New Physics and Old Times [PDF]

, 2013
Cosmic birefringence (CB)---a rotation of photon-polarization plane in vacuum---is a generic signature of new scalar fields that could provide dark energy. Previously, WMAP observations excluded a uniform CB-rotation angle larger than a degree.
Gluščević, Vera
core   +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

Line-of-sight shear in SLACS strong lenses II: validation tests with an extended sample

The Open Journal of Astrophysics
Strong gravitational lensing images are subject to shape distortions due to inhomogeneities along the line of sight. The leading order shape distortion is shear, which, if measurable, will be a complementary cosmological probe to traditional cosmic shear.
Natalie B. Hogg, Daniel P. Johnson, Anowar J. Shajib, Julien Larena   +3 more
doaj   +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

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

Spectral Stacking: Unbiased Shear Estimation for Weak Gravitational Lensing

, 2009
We present a new method for the estimation of shear in gravitational lensing from a set of galaxy images with unknown distribution of shapes. Common procedures first compute an estimate of some characteristic feature for each individual galaxy and then average over these.
Hosseini, R., Bethge, M.
openaire   +1 more source