Results 11 to 20 of about 33,319 (274)

Andromeda’s Parachute: Time Delays and Hubble Constant

The Astrophysical Journal, 2023
The gravitational lens system PS J0147+4630 (Andromeda’s Parachute) consists of four quasar images ABCD and a lensing galaxy. We obtained r -band light curves of ABCD in the 2017−2022 period from monitoring with two 2 m class telescopes.
Vyacheslav N. Shalyapin, Luis J. Goicoechea, Karianne Dyrland, Håkon Dahle   +3 more
doaj   +1 more source

Domain Adaptation for Simulation-based Dark Matter Searches with Strong Gravitational Lensing

The Astrophysical Journal, 2023
The identity of dark matter has remained surprisingly elusive. While terrestrial experiments may be able to nail down a model, an alternative method is to identify dark matter based on astrophysical or cosmological signatures.
Stephon Alexander, Sergei Gleyzer, Hanna Parul, Pranath Reddy, Marcos Tidball, Michael W. Toomey   +5 more
doaj   +1 more source

Strong Deflection Gravitational Lensing for the Photons Coupled to the Weyl Tensor in a Conformal Gravity Black Hole

Universe, 2023
In the present paper, strong deflection gravitational lensing is studied in a conformal gravity black hole. With the help of geometric optics limits, we have formulated the light cone conditions for the photons coupled to the Weyl tensor in a conformal ...
Ghulam Abbas, Ali Övgün, Asif Mahmood, Muhammad Zubair   +3 more
doaj   +1 more source

Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327

The Astrophysical Journal, 2023
Exploiting the fundamentally achromatic nature of gravitational lensing, we present a lens model for the massive galaxy cluster SMACS J0723.3−7323 (SMACS J0723; z = 0.388) that significantly improves upon earlier work.
Guillaume Mahler, Mathilde Jauzac, Johan Richard, Benjamin Beauchesne, Harald Ebeling, David Lagattuta, Priyamvada Natarajan, Keren Sharon, Hakim Atek, Adélaïde Claeyssens, Benjamin Clément, Dominique Eckert, Alastair Edge, Jean-Paul Kneib, Anna Niemiec   +14 more
doaj   +1 more source

Effects of early dark energy on strong cluster lensing [PDF]

, 2006
We use the semi-analytic method developed by Fedeli et al. for computing strong-lensing optical depths to study the statistics of gravitational arcs in four dark-energy cosmologies. Specifically, we focus on models with early dark energy and compare them
Bartelmann, Bartelmann, Bartelmann, Bartelmann, Bartelmann, Benson, Bond, Brax, C. Fedeli, Caldwell, Cassano, Chandrasekhar, Dalal, Dolag, Doran, Doran, Fedeli, Ferreira, Gladders, Goldstein, Hasinger, Hawkins, Keeton, Lacey, Li, M. Bartelmann, Manera, Maor, Meneghetti, Meneghetti, Meneghetti, Meneghetti, Mota, Navarro, Navarro, Peebles, Peebles, Press, Randall, Readhead, Rebolo, Riess, Smail, Somerville, Spergel, Tegmark, Thompson, Torri, Wambsganss, Wang, Wetterich, Wetterich, Zaritsky   +52 more
core   +1 more source

Two Lensed Star Candidates at z ≃ 4.8 behind the Galaxy Cluster MACS J0647.7+7015

The Astrophysical Journal Letters, 2023
We report the discovery of two extremely magnified lensed star candidates behind the galaxy cluster MACS J0647.7+015 using recent multiband James Webb Space Telescope (JWST) NIRCam observations. The star candidates are seen in a previously known, z _phot
Ashish Kumar Meena, Adi Zitrin, Yolanda Jiménez-Teja, Erik Zackrisson, Wenlei Chen, Dan Coe, Jose M. Diego, Paola Dimauro, Lukas J. Furtak, Patrick L. Kelly, Masamune Oguri, Brian Welch, Abdurro’uf, Felipe Andrade-Santos, Angela Adamo, Rachana Bhatawdekar, Maruša Bradač, Larry D. Bradley, Tom Broadhurst, Christopher J. Conselice, Pratika Dayal, Megan Donahue, Brenda L. Frye, Seiji Fujimoto, Tiger Yu-Yang Hsiao, Vasily Kokorev, Guillaume Mahler, Eros Vanzella, Rogier A. Windhorst   +28 more
doaj   +1 more source

Strong Gravitational Lensing by Kiselev Black Hole [PDF]

, 2015
We investigate the gravitational lensing scenario due to Schwarzschild-like black hole surrounded by quintessence (Kiselev black hole). We work for the special case of Kiselev black hole where we take the state parameter $w_{q}=-\frac{2}{3}$.
Bahamonde, Sebastian, Hussain, Saqib, Jamil, Mubasher, Younas, Azka   +3 more
core   +2 more sources

Exploring the Possible Evolution of the Mass Density Power-law Index of Strong Gravitational Lenses with a Model-independent Method

The Astrophysical Journal, 2023
In this work, we adopt a cosmological model-independent approach for the first time to test the question of whether the mass density power-law index ( γ ) of strong gravitational lensing systems (SGLSs) evolves with redshift, and the joint light-curve ...
Jian Hu
doaj   +1 more source

Strong Gravitational Lensing and Dark Energy Complementarity [PDF]

, 2004
In the search for the nature of dark energy most cosmological probes measure simple functions of the expansion rate. While powerful, these all involve roughly the same dependence on the dark energy equation of state parameters, with anticorrelation ...
A. Cooray, A. Goobar, A.N. Davis, B.A. Bassett, C. Alcock, C.P. Ma, D.E. Holz, E.V. Linder, E.V. Linder, E.V. Linder, E.V. Linder, E.V. Linder, E.V. Linder, E.V. Linder, Eric V. Linder, G.F. Lewis, G.M. Bernstein, H-J. Seo, I.M.H. Etherington, J.A. Frieman, K. Yamamoto, M. Kuhlen, M. Oguri, M. Oguri, M. Takada, N. Dalal, N. Sarbu, R. Davé, R.C. Tolman   +28 more
core   +3 more sources

Magnetic Lensing near Ultramagnetized Neutron Stars [PDF]

, 1999
Extremely strong magnetic fields change the vacuum index of refraction. This induces a lensing effect that is not unlike the lensing phenomenon in strong gravitational fields.
Adler, Arzoumanian, Baring, Baring, Berestetskii, Dittrich, Erber, Gold, Greenstein, Gudmundsson, Hernquist, Hernquist, Hewish, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Heyl, Jeremy S. Heyl, Klein, Klein, Kouveliotou, Kouveliotou, Landau, Mielnieczuk, Nir J. Shaviv, Page, Pavlov, Rajagopal, Schaaf, Schaaf, Shapiro, Shibanov, Thompson, Thompson, Vasisht, Yoram Lithwick   +39 more
core   +3 more sources