Results 1 to 10 of about 11,925 (196)

Peaks in weak lensing mass maps for cluster astrophysics and cosmology [PDF]

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
Clusters of galaxies can be identified from the peaks in weak lensing aperture mass maps constructed from weak lensing shear catalogs. Such purely gravitational cluster selection differs considerably from traditional cluster selection based on the ...
Masamune OGURI, Satoshi MIYAZAKI
doaj   +2 more sources

Toward an Optimal Reconstruction of the Shear Field with PDF-folding

The Astrophysical Journal, 2023
Weak lensing provides a direct way of mapping the density distribution in the Universe. To reconstruct the density field from the shear catalog, an important step is to build the shear field from the shear catalog, which can be quite nontrivial due to ...
Haoran Wang, Jun Zhang, Hekun Li, Cong Liu   +3 more
doaj   +1 more source

Testing Velocity-field Lensing on IllustrisTNG Galaxies

The Astrophysical Journal, 2023
Weak gravitational lensing shear could be measured far more precisely if information about unlensed attributes of source galaxies were available. Disk galaxy velocity fields supply such information, at least in principle, with idealized models predicting
Jean Donet, David Wittman
doaj   +1 more source

Lensing in the Blue. II. Estimating the Sensitivity of Stratospheric Balloons to Weak Gravitational Lensing

The Astronomical Journal, 2023
The Superpressure Balloon-borne Imaging Telescope ( SuperBIT ) is a diffraction-limited, wide-field, 0.5 m, near-infrared to near-ultraviolet observatory designed to exploit the stratosphere’s space-like conditions.
Jacqueline E. McCleary, Spencer W. Everett, Mohamed M. Shaaban, Ajay S. Gill, Georgios N. Vassilakis, Eric M. Huff, Richard J. Massey, Steven J. Benton, Anthony M. Brown, Paul Clark, Bradley Holder, Aurelien A. Fraisse, Mathilde Jauzac, William C. Jones, David Lagattuta, Jason S.-Y. Leung, Lun Li, Thuy Vy T. Luu, Johanna M. Nagy, C. Barth Netterfield, Emaad Paracha, Susan F. Redmond, Jason D. Rhodes, Jürgen Schmoll, Ellen Sirks, Sut Ieng Tam   +25 more
doaj   +1 more source

An Unbiased Method of Measuring the Ratio of Two Data Sets

The Astrophysical Journal Supplement Series, 2023
In certain cases of astronomical data analysis, the meaningful physical quantity to extract is the ratio R between two data sets. Examples include the lensing ratio, the interloper rate in spectroscopic redshift samples, and the decay rate of ...
Zeyang Sun, Pengjie Zhang, Fuyu Dong, Ji Yao, Huanyuan Shan, Eric Jullo, Jean-Paul Kneib, Boyan Yin   +7 more
doaj   +1 more source

Intrinsic alignment-lensing interference as a contaminant of cosmic shear [PDF]

, 2004
Cosmic shear surveys have great promise as tools for precision cosmology, but can be subject to systematic errors including intrinsic ellipticity correlations of the source galaxies. The intrinsic alignments are believed to be small for deep surveys, but
Hirata, Christopher M., Seljak, Uroš
core   +1 more source

Weak lensing power spectra for precision cosmology: Multiple-deflection, reduced shear and lensing bias corrections [PDF]

, 2010
It is usually assumed that the ellipticity power spectrum measured in weak lensing observations can be expressed as an integral over the underlying matter power spectrum. This is true at second order in the gravitational potential. We extend the standard
Albrecht, Bartelmann, Benjamin, Bernardeau, Bernstein, Blumenthal, Bridle, Broadhurst, Bullock, C. M. Hirata, Cooray, Cooray, Cooray, Dodelson, Dodelson, E. Krause, Efstathiou, Fry, Fu, Gnedin, Heitmann, Heitmann, Hilbert, Hirata, Hirata, Hui, Jain, Jing, Joachimi, Joachimi, Kaiser, King, King, Komatsu, Levine, Ma, Mandelbaum, Massey, Massey, Navarro, Pedrosa, Peebles, Rudd, Schmidt, Schmidt, Schmidt, Schneider, Schneider, Schrabback, Scoccimarro, Seitz, Seljak, Shapiro, Shapiro, Sheth, Smith, Vishniac, Zentner, Zhang   +58 more
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Biased Dark Energy Constraints from Neglecting Reduced Shear in Weak Lensing Surveys [PDF]

, 2008
The weak gravitational lensing of distant galaxies by large-scale structure is expected to become a powerful probe of dark energy. By measuring the ellipticities of large numbers of background galaxies, the subtle gravitational distortion called "cosmic ...
Shapiro, Charles
core   +2 more sources

Measurement and Calibration of Noise Bias in Weak Lensing Galaxy Shape Estimation [PDF]

, 2012
Weak gravitational lensing has the potential to constrain cosmological parameters to high precision. However, as shown by the Shear TEsting Programmes (STEP) and GRavitational lEnsing Accuracy Testing (GREAT) Challenges, measuring galaxy shears is a ...
Amara, Adam, Bridle, Sarah, Hirsch, Michael, Kacprzak, Tomasz, Refregier, Alexandre, Rowe, Barnaby, Voigt, Lisa, Zuntz, Joe   +7 more
core   +2 more sources

Metadetection Weak Lensing for the Vera C. Rubin Observatory

The Open Journal of Astrophysics, 2023
Forthcoming astronomical imaging surveys will use weak gravitational lensing shear as a primary probe to study dark energy, with accuracy requirements at the 0.1% level.
Erin S. Sheldon, Matthew R. Becker, Michael Jarvis, Robert Armstrong, LSST Dark Energy Science Collaboration   +4 more
doaj   +1 more source