Results 41 to 50 of about 30,456 (275)

Compact Groups analysis using weak gravitational lensing [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We present a weak lensing analysis of a sample of SDSS Compact Groups (CGs). Using the measured radial density contrast profile, we derive the average masses under the assumption of spherical symmetry, obtaining a velocity dispersion for the Singular Isothermal Spherical model, $ _V = 270 \pm 40 \rm ~km~s^{-1}$, and for the NFW model, $R_{200}=0.53 ...
Chalela Garcia, Martin, Gonzalez, Elizabeth Johana, Garcia Lambas, Diego Rodolfo, Föex, Gael   +3 more
openaire   +4 more sources

A Methodological Framework to Study Change in Team Cognition Under the Dynamical Hypothesis

Topics in Cognitive Science, EarlyView., 2023
Abstract The dynamical hypothesis claims that cognitive systems, such as teams, are dynamical systems (i.e., an interdependent collection of individuals and their technology that change together over time). Following this hypothesis, team researchers have adopted dynamical approaches to better understand the team cognitive processes and states that ...
Kyana van Eijndhoven, Travis J. Wiltshire, Elwira A. Hałgas, Josette M. P. Gevers   +3 more
wiley   +1 more source

Weak-lensing Mass Bias in Merging Galaxy Clusters

The Astrophysical Journal, 2023
Although weak lensing (WL) is a powerful method to estimate a galaxy cluster mass without any dynamical assumptions, a model bias can arise when the cluster density profile departs from the assumed model profile. In a merging system, the bias is expected
Wonki Lee, Sangjun Cha, M. James Jee, Daisuke Nagai, Lindsay King, John ZuHone, Urmila Chadayammuri, Sharon Felix, Kyle Finner   +8 more
doaj   +1 more source

Weak Gravitational Lensing Bispectrum

The Astrophysical Journal, 2001
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters which govern them. The non-linear evolution of large scale structure produces a non-Gaussian signal which is potentially observable in galaxy shear data.
Cooray, Asantha, Hu, Wayne
openaire   +2 more sources

Aperture multipole moments from weak gravitational lensing [PDF]

Monthly Notices of the Royal Astronomical Society, 1997
14 pages including 3 figures; submitted to MNRAS; replaced to improve printing on non-A4 ...
Schneider, Peter, Bartelmann, Matthias
openaire   +2 more sources

Weak lensing, dark matter and dark energy

, 2010
Weak gravitational lensing is rapidly becoming one of the principal probes of dark matter and dark energy in the universe. In this brief review we outline how weak lensing helps determine the structure of dark matter halos, measure the expansion rate of ...
A. Amara, A. Cooray, A. Cooray, A. Leauthaud, A. Leauthaud, A. Refregier, A. Refregier, A.F. Heavens, A.N. Taylor, A.P. Hearin, A.R. Zentner, B. Jain, B. Jain, B. Jain, B. Joachimi, C. Heymans, C. Schimd, C. Shapiro, C. Shapiro, D. Clowe, D. Huterer, D. Huterer, D. Huterer, D. Huterer, D. Huterer, D. Munshi, D. Wittman, D. Wittman, D. Wittman, D.E. Johnston, D.H. Rudd, D.J. Bacon, D.M. Wittman, D.N. Spergel, Dragan Huterer, E. Rozo, E.S. Sheldon, E.S. Sheldon, E.V. Linder, E.V. Linder, F. Bernardeau, F. Bernardeau, F. Schmidt, F. Schmidt, G. Bernstein, G. Bernstein, G. Wilson, G.B. Zhao, G.M. Bernstein, G.M. Bernstein, G.R. Dvali, H. Dahle, H. Hoekstra, H. Hoekstra, H. Hoekstra, H. Hoekstra, H. Oyaizu, H. Zhan, J. Benjamin, J. Frieman, J. Guzik, J. Miralda-Escude, J. Rhodes, J. Zhang, J.A. Tyson, J.F. Hennawi, J.M. Kratochvil, J.P. Dietrich, J.P. Uzan, K. Heitmann, K. Heitmann, K. Heitmann, L. Amendola, L. Fu, L. Hui, L. Marian, L. Marian, L. Van Waerbeke, L. Waerbeke van, M. Bartelmann, M. Hetterscheidt, M. Ishak, M. Jarvis, M. Jarvis, M. Kamionkowski, M. Kilbinger, M. Kleinheinrich, M. Schirmer, M. Takada, M. Takada, M. Takada, M. Takada, M.J. White, M.J. White, M.L. Brown, N. Kaiser, N. Kaiser, N. Padmanabhan, P. Fischer, P. Schneider, P. Schneider, P. Simon, R. Mandelbaum, R. Mandelbaum, R. Massey, R. Massey, R. Massey, R. Reyes, S. Dodelson, S. Dodelson, S. Miyazaki, S.F. Daniel, T. Hamana, T.D. Kitching, T.G. Brainerd, U.L. Pen, W. Hu, W. Hu, W. Hu, W. Hu, W. Hu, W.J. Fang, Z. Ma, Z.M. Ma   +123 more
core   +1 more source

Probing satellite haloes with weak gravitational lensing [PDF]

Monthly Notices of the Royal Astronomical Society, 2012
We demonstrate the possibility of detecting tidal stripping of dark matter subhalos within galaxy groups using weak gravitational lensing. We have run ray-tracing simulations on galaxy catalogues from the Millennium Simulation to generate mock shape catalogues. The ray-tracing catalogues assume a halo model for galaxies and groups, using various models
Gillis, Bryan R., Hudson, Michael J., Hilbert, Stefan, Hartlap, Jan   +3 more
openaire   +2 more sources

The Ray Bundle method for calculating weak magnification by gravitational lenses [PDF]

, 1998
We present here an alternative method for calculating magnifications in gravitational lensing calculations -- the Ray Bundle method. We provide a detailed comparison between the distribution of magnifications obtained compared with analytic results and ...
C. J. Fluke, Daniel J. Mortlock, Dyer, Einstein, Irwin, Kayser, Kayser, Kofman, Lewis, Lynds, Narayan, Paczyński, Peacock, Pei, R. L. Webster, Rauch, Schneider, Schneider, Schneider, Soucail, Walsh, Wambsganss, Wambsganss, Wambsganss, Weinberg   +24 more
core   +3 more sources

Optical properties of null geodesics emerging from dynamical systems

European Physical Journal C: Particles and Fields, 2022
We study optical metrics via null geodesics as a central force system, deduce the related Binet equation and apply the analysis to certain solutions of Einstein’s equations with and without spherical symmetry.
D. Batic, S. Chanda, P. Guha
doaj   +1 more source

Intrinsic alignment boosting: Direct measurement of intrinsic alignments in cosmic shear data [PDF]

, 2010
Intrinsic alignments constitute the major astrophysical systematic for cosmological weak lensing surveys. We present a purely geometrical method with which one can study gravitational shear-intrinsic ellipticity correlations directly in weak lensing data.
Amara, B. Joachimi, Bacon, Benjamin, Bernstein, Bridle, Bridle, Brown, Catelan, Crittenden, Croft, Eifler, Eisenstein, Fu, Heymans, Heymans, Heymans, Hirata, Hirata, Huterer, Ilbert, Jing, Joachimi, Joachimi, Joachimi, King, King, King, Kitching, Lee, Mackey, Mandelbaum, Munshi, Okumura, Okumura, P. Schneider, Pen, Schneider, Schrabback, Semboloni, Smail, Smith, Takada, Tegmark, van den Bosch, van Waerbeke, Wittman   +46 more
core   +1 more source