Results 111 to 120 of about 11,925 (196)
Gravitational Flexion by Elliptical Dark Matter Haloes
, 2009 We present equations for the gravitational lensing flexion expected for an elliptical lens mass distribution. These can be reduced to one-dimensional finite integrals, thus saving significant computing time over a full two-dimensional calculation.
A. J. Hawken +38 more
core +1 more source
Black Hole–Halo Mass Relation from UNIONS Weak Lensing
The Astrophysical Journal LettersThis Letter presents, for the first time, direct constraints on the black hole–halo mass relation using weak gravitational-lensing measurements. We construct type I and type II active galactic nucleus (AGN) samples from the Sloan Digital Sky Survey, with
Qinxun Li +22 more
doaj +1 more source
The Astrophysical JournalXu & Jing reported a monotonic relationship between the host halo mass M _h and the morphology of massive central galaxies, characterized by the Sérsic index n , at fixed stellar mass, suggesting that morphology could serve as a good secondary proxy for ...
Zhenjie Liu +4 more
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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
Monthly Notices of the Royal Astronomical SocietyABSTRACT We update the publicly available weak lensing shear measurement algorithm pyRRG for the JWST, and apply it to UNCOVER DR1 imaging of galaxy cluster Abell 2744. At short wavelengths (${\lt}2.5\, \mu$m), shear measurements are consistent between independent observations through different JWST bandpasses, and calibrated within 1.5 ...
David R Harvey, Richard Massey
openaire +2 more sources
Modeling the Impacts of Galaxy Intrinsic Alignments on Weak Lensing Peak Statistics
The Astrophysical JournalWeak gravitational lensing (WL) peak statistics capture cosmic nonlinear structures and can provide additional cosmological information complementary to cosmic shear two-point correlation analyses.
Tianyu Zhang +7 more
doaj +1 more source
The Open Journal of AstrophysicsHigh-fidelity simulated astronomical images are an important tool in developing and measuring the performance of image-processing algorithms, particularly for high precision measurements of cosmic shear -- correlated distortions of images of distant ...
Claire-Alice Hébert +4 more
doaj +1 more source
Testing general relativity with cosmological large scale structure. [PDF]
Gen Relativ Gravit, 2022 Durrer R.
europepmc +1 more source
Galaxy–Galaxy Lensing Data: f(T) Gravity Challenges General Relativity
The Astrophysical JournalWe use galaxy–galaxy lensing data to test general relativity and f ( T ) gravity at galaxy scales. We consider an exact spherically symmetric solution of f ( T ) theory, which is obtained from an approximate quadratic correction, and thus it is expected ...
Qingqing Wang +5 more
doaj +1 more source