Results 81 to 90 of about 184 (166)

The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics

The Open Journal of Astrophysics
The current generation of large galaxy surveys will test the cosmological model by combining multiple types of observational probes. Realising the statistical promise of these new datasets requires rigorous attention to all aspects of analysis including ...
Chris Blake, C. Garcia-Quintero, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, J. DeRose, A. Dey, P. Doel, N. Emas, S. Ferraro, J. E. Forero-Romero, G. Gutierrez, S. Heydenreich, K. Honscheid, C. Howlett, M. Ishak, S. Joudaki, E. Jullo, R. Kehoe, D. Kirkby, A. Kremin, A. Krolewski, M. Landriau, J. U. Lange, A. Leauthaud, M. E. Levi, M. Manera, R. Miquel, J. Moustakas, G. Niz, W. J. Percival, I. Pérez-Ràfols, A. Porredon, G. Rossi, R. Ruggeri, E. Sanchez, C. Saulder, D. Schlegel, D. Sprayberry, Z. Sun, G. Tarlé, B. A. Weaver   +43 more
doaj   +1 more source

Black Hole–Halo Mass Relation from UNIONS Weak Lensing

The Astrophysical Journal Letters
This 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, Martin Kilbinger, Wentao Luo, Kai Wang, Huiyuan Wang, Anna Wittje, Hendrik Hildebrandt, Ludovic Van Waerbeke, Michael J. Hudson, Samuel Farrens, Tobías I. Liaudat, Huiling Liu, Ziwen Zhang, Qingqing Wang, Elisa Russier, Axel Guinot, Lucie Baumont, Fabian Hervas Peters, Thomas de Boer, Jiaqi Wang, Alan McConnachie, Jean-Charles Cuillandre, Sébastien Fabbro   +22 more
doaj   +1 more source

The Dependence of Dark Matter Halo Properties on the Morphology of Their Central Galaxies from Weak Lensing

The Astrophysical Journal
Xu & 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, Kun Xu, Jun Zhang, Wenting Wang, Cong Liu   +4 more
doaj   +1 more source

Modeling the Impacts of Galaxy Intrinsic Alignments on Weak Lensing Peak Statistics

The Astrophysical Journal
Weak 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, Xiangkun Liu, Ziwei Li, Chengliang Wei, Guoliang Li, Yu Luo, Xi Kang, Zuhui Fan   +7 more
doaj   +1 more source

Generation of realistic input parameters for simulating atmospheric point-spread functions at astronomical observatories

The Open Journal of Astrophysics
High-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, Joshua E. Meyers, My H. Do, Patricia R. Burchat, LSST Dark Energy Science Collaboration   +4 more
doaj   +1 more source

Pixel Noise Effect and its Correction method by ERA Method for Precise Weak Gravitational Lensing Shear Measurement

, 2017
15 ...
Okura, Yuki, Futamase, Toshifumi
openaire   +2 more sources

Galaxy–Galaxy Lensing Data: f(T) Gravity Challenges General Relativity

The Astrophysical Journal
We 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, Xin Ren, Bo Wang, Yi-Fu Cai, Wentao Luo, Emmanuel N. Saridakis   +5 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

Weak gravitational lensing measurements of Abell 2744 using JWST and shear measurement algorithm pyRRG-JWST

Monthly Notices of the Royal Astronomical Society
ABSTRACT 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

Simulating Image Coaddition with the Nancy Grace Roman Space Telescope. IV. Hyperparameter Optimization and Experimental Features

The Astrophysical Journal
For weak gravitational lensing cosmology with the forthcoming Nancy Grace Roman Space Telescope, image coaddition (or construction of oversampled images from undersampled ones) is a critical step in the image processing pipeline.
Kaili Cao, Christopher M. Hirata, Katherine Laliotis, Masaya Yamamoto, Emily Macbeth, M. A. Troxel, (Roman HLIS Cosmology PIT)   +6 more
doaj   +1 more source