Results 41 to 50 of about 340,378 (352)

A New Way to Explore Cosmological Tensions Using Gravitational Waves and Strong Gravitational Lensing [PDF]

Astrophysical Journal, 2021
In recent years, a crisis in the standard cosmology has been caused by inconsistencies in the measurements of some key cosmological parameters, the Hubble constant H 0 and cosmic curvature parameter Ω K , for example.
Mengran Cao, Jie Zheng, Jing Qi, Xin Zhang, Zong-hong Zhu   +4 more
semanticscholar   +1 more source

Geometric Outlines of the Gravitational Lensing and Its Astronomic Applications

Universe, 2023
Gravitational lensing is a topic of great application value in the field of astronomy. The properties and research methods of gravitational lensing are closely related to the geometric and relativistic characteristics of the background universe.
Bin Shen, Mingyang Yu
doaj   +1 more source

Strong gravitational lensing by Kerr and Kerr-Newman black holes [PDF]

Physical Review D, 2021
We study the strong gravitational lensing due to the Kerr black holes with angular momentum $a$ and the Kerr-Newman black holes with additional charge $Q$.
T. Hsieh, Da-Shin Lee, Chi-Yong Lin
semanticscholar   +1 more source

Gravitational Lensing of Acoustic Charged Black Holes

The Astrophysical Journal, 2023
We study the gravitational lensing of acoustic charged black holes in strong and weak field limit approximations. For this purpose, we first numerically obtain the deflection limit coefficients and deflection angle in the strong field limit.
Niyaz Uddin Molla, Ujjal Debnath
doaj   +1 more source

A Highly Magnified Gravitationally Lensed Red QSO at z = 2.5 with a Significant Flux Ratio Anomaly

The Astrophysical Journal, 2023
We present the discovery of a gravitationally lensed dust-reddened QSO at z = 2.517, identified in a survey for QSOs by infrared selection. Hubble Space Telescope imaging reveals a quadruply lensed system in a cusp configuration, with a maximum image ...
Eilat Glikman, Cristian E. Rusu, Geoff C.-F. Chen, James Hung-Hsu Chan, Cristiana Spingola, Hannah Stacey, John McKean, Ciprian T. Berghea, S. G. Djorgovski, Matthew J. Graham, Daniel Stern, Tanya Urrutia, Mark Lacy, Nathan J. Secrest, John M. O’Meara   +14 more
doaj   +1 more source

deeplenstronomy: A dataset simulation package for strong gravitational lensing [PDF]

Journal of Open Source Software, 2021
Automated searches for strong gravitational lensing in optical imaging survey datasets often employ machine learning and deep learning approaches. These techniques require more example systems to train the algorithms than have presently been discovered ...
R. Morgan, B. Nord, S. Birrer, J. Lin, J. Poh   +4 more
semanticscholar   +1 more source

Determination of Lens Mass Density Profile from Strongly Lensed Gravitational-wave Signals

The Astrophysical Journal, 2023
As the interferometers detecting gravitational waves are upgraded, improving their sensitivity, the probability of observing strong lensing increases. Once a detection is made, it will be critical to gain as much information as possible about the lensing
Mick Wright, Justin Janquart, Martin Hendry   +2 more
doaj   +1 more source

Galaxy-scale Test of General Relativity with Strong Gravitational Lensing [PDF]

Astrophysical Journal, 2021
Although general relativity (GR) has been precisely tested at the solar system scale, precise tests at a galactic or cosmological scale are still relatively insufficient.
Xiaohong Liu, Zhenhua Li, Jing Qi, Xin Zhang   +3 more
semanticscholar   +1 more source

Identification of Galaxy–Galaxy Strong Lens Candidates in the DECam Local Volume Exploration Survey Using Machine Learning

The Astrophysical Journal, 2023
We perform a search for galaxy–galaxy strong lens systems using a convolutional neural network (CNN) applied to imaging data from the first public data release of the DECam Local Volume Exploration Survey, which contains ∼520 million astronomical sources
E. A. Zaborowski, A. Drlica-Wagner, F. Ashmead, J. F. Wu, R. Morgan, C. R. Bom, A. J. Shajib, S. Birrer, W. Cerny, E. J. Buckley-Geer, B. Mutlu-Pakdil, P. S. Ferguson, K. Glazebrook, S. J. Gonzalez Lozano, Y. Gordon, M. Martinez, V. Manwadkar, J. O’Donnell, J. Poh, A. Riley, J. D. Sakowska, L. Santana-Silva, B. X. Santiago, D. Sluse, C. Y. Tan, E. J. Tollerud, A. Verma, J. A. Carballo-Bello, Y. Choi, D. J. James, N. Kuropatkin, C. E. Martínez-Vázquez, D. L. Nidever, J. L. Nilo Castellon, N. E. D. Noël, K. A. G. Olsen, A. B. Pace, S. Mau, B. Yanny, A. Zenteno, T. M. C. Abbott, M. Aguena, O. Alves, F. Andrade-Oliveira, S. Bocquet, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, C. J. Conselice, M. Costanzi, M. E. S. Pereira, J. De Vicente, S. Desai, J. P. Dietrich, P. Doel, S. Everett, I. Ferrero, B. Flaugher, D. Friedel, J. Frieman, J. García-Bellido, D. Gruen, R. A. Gruendl, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, H. Lin, J. L. Marshall, P. Melchior, J. Mena-Fernández, F. Menanteau, R. Miquel, A. Palmese, F. Paz-Chinchón, A. Pieres, A. A. Plazas Malagón, J. Prat, M. Rodriguez-Monroy, A. K. Romer, E. Sanchez, V. Scarpine, I. Sevilla-Noarbe, M. Smith, E. Suchyta, C. To, N. Weaverdyck, DELVE & DES Collaborations   +91 more
doaj   +1 more source

DESI-253.2534+26.8843: A New Einstein Cross Spectroscopically Confirmed with Very Large Telescope/MUSE and Modeled with GIGA-Lens

The Astrophysical Journal Letters, 2023
Gravitational lensing provides unique insights into astrophysics and cosmology, including the determination of galaxy mass profiles and constraining cosmological parameters.
Aleksandar Cikota, Ivonne Toro Bertolla, Xiaosheng Huang, Saul Baltasar, Nicolas Ratier-Werbin, William Sheu, Christopher Storfer, Nao Suzuki, David J. Schlegel, Regis Cartier, Simon Torres, Stefan Cikota, Eric Jullo   +12 more
doaj   +1 more source