Results 21 to 30 of about 11,925 (196)

Simulations of weak gravitational lensing – II. Including finite support effects in cosmic shear covariance matrices [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
(Abridged) We investigate and quantify the impact of finite simulation volume on weak lensing two- and four-point statistics. These {\it finite support} (FS) effects are modelled for several estimators, simulation box sizes and source redshifts, and validated against a new large suite of 500 $N$-body simulations.
Harnois-Déraps, J, van Waerbeke, L
openaire   +2 more sources

A NEW METHOD FOR MEASURING WEAK GRAVITATIONAL LENSING SHEAR USING HIGHER ORDER SPIN-2 HOLICs [PDF]

The Astrophysical Journal, 2009
Accepted for publication in ApJ; 10 pages, 7 figures, uses aastex ...
Okura, Yuki, Futamase, Toshifumi
openaire   +2 more sources

Probing the Universe with Weak Lensing [PDF]

, 1998
Gravitational lenses can provide crucial information on the geometry of the Universe, on the cosmological scenario of formation of its structures as well as on the history of its components with look-back time.
Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bartelmann M, Bernardeau F, Bernardeau F, Bernardeau F, Bernardeau F, Bingelli B, Blanchard A, Blandford RD, Bonnet H, Bézecourt J, Bézecourt J, Bézecourt J, Böhringer H, Casoli F, Cayón L, Cooray AR, Fort B, Fort B, Fort B, Fugmann W, Garrido JL, Hammer F, Hattori M, Kneib J-P, Kneib J-P, Kneib J-P, Kneib J-P, Kochanek CS, Lombardi M, Lombardi M, Lombardi M, Lynds R, Lémonon L, Maddox SJ, Mellier Y, Pelló R, Pierre M, Puget J-L, Reblinksy K, Schindler S, Schneider P, Schneider P, Schneider P, Schneider P, Schramm T, Seitz C, Seitz C, Seitz C, Seitz S, Seitz S, Seitz S, Smail I, Soucail G, Soucail G, Van Waerbeke L, Van Waerbeke L, Van Waerbeke L, Van Waerbeke L, Yannick Mellier, Zel'dovich YB, Zhu Z-H, Zwicky F   +70 more
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Weak gravitational lensing shear estimation with metacalibration for the Roman High-Latitude Imaging Survey

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We investigate the performance of the metacalibration shear calibration framework using simulated imaging data for the Nancy Grace Roman Space Telescope (Roman) reference High-Latitude Imaging Survey (HLIS). The weak lensing programme of Roman requires the mean weak lensing shear estimate to be calibrated within about 0.03 per ...
Masaya Yamamoto, M A Troxel, Mike Jarvis, Rachel Mandelbaum, Christopher Hirata, Heyang Long, Ami Choi, Tianqing Zhang   +7 more
openaire   +3 more sources

The Cosmological Impact of Intrinsic Alignment Model Choice for Cosmic Shear [PDF]

, 2011
We consider the effect of galaxy intrinsic alignments (IAs) on dark energy constraints from weak gravitational lensing. We summarise the latest version of the linear alignment model of IAs, following the brief note of Hirata & Seljak (2010) and further ...
Anais Rassat, Bartelmann, Bernstein, Blazek, Bridle, Brown, Buergers, Catelan, Ciotti, Crittenden, Croft, Dekel, Donnacha Kirk, Doroshkevich, Eisenstein, Heavens, Heavens, Heymans, Heymans, Hirata, Hirata, Hirata, Hoekstra, Hu, Hu, Huterer, Jing, Joachimi, Joachimi, Joachimi, Kaiser, Kaiser, King, King, King, Kirk, Mackey, Mandelbaum, Munshi, Okumura, Okumura, Ole Host, Peebles, Refregier, Sarah Bridle, Schaefer, Schneider, Schrabback, Sciama, Smith, Takada, van den Bosch, van Waerbeke, White, Wittman   +54 more
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Gravitational lensing shear by an exotic lens object with negative convergence or negative mass [PDF]

Physical Review D, 2013
Gravitational lens models with negative convergence(surface mass density projected onto the lens plane) inspired by modified gravity theories, exotic matter and energy have been recently discussed in such a way that a static and spherically-symmetric modified spacetime metric depends on the inverse distance to the power of positive $n$(n=1 for ...
Izumi, Koji, Hagiwara, Chisaki, Nakajima, Koki, Kitamura, Takao, Asada, Hideki   +4 more
openaire   +2 more sources

Dark Matter Sterile Neutrino from Scalar Decays

Universe, 2021
We place constraints on DM sterile neutrino scalar decay production (SDP) assuming that sterile neutrinos representa fraction from the total Cold Dark Matter energy density. For the cosmological analysis we complement the CMB anisotropy measurements with
Lucia Aurelia Popa
doaj   +1 more source

Weak gravitational lensing with the Square Kilometre Array [PDF]

, 2015
We investigate the capabilities of various stages of the SKA to perform world-leading weak gravitational lensing surveys. We outline a way forward to develop the tools needed for pursuing weak lensing in the radio band.
Abdalla, F. B., Bacon, D. J., Bridle, S., Brown, M. L., Camera, S., Harrison, I., Jarvis, M., Joachimi, B., Kitching, T. D., Metcalf, R. B., Miller, L., Patel, P., Pourtsidou, A., Takahashi, K., Zuntz, J. A.   +14 more
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Source Distributions of Cosmic Shear Surveys in Efficiency Space

The Open Journal of Astrophysics, 2020
We show that the lensing efficiency of cosmic shear generically has a simple shape, even in the case of a tomographic survey with badly behaved photometric redshifts.
Nicolas Tessore, Ian Harrison
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