Results 101 to 110 of about 11,925 (196)

Propagating Residual Biases in Cosmic Shear Power Spectra

The Open Journal of Astrophysics, 2019
In this paper we derive a full expression for the propagation of multiplicative and additive shape measurement biases into the cosmic shear power spectrum.
Thomas D. Kitching, Paniez Paykari, Henk Hoekstra, Mark Cropper   +3 more
doaj   +1 more source

Lectures on Gravitational Lensing [PDF]

, 1996
These lectures give an introduction to Gravitational Lensing. We discuss lensing by point masses, lensing by galaxies, and lensing by clusters and larger-scale structures in the Universe. The relevant theory is developed and applications to astrophysical
Bartelmann, Matthias, Narayan, Ramesh
core   +2 more sources

CMB Lensing Reconstruction in Real Space

, 2010
We explore the reconstruction of the gravitational lensing field of the cosmic microwave background in real space showing that very little statistical information is lost when estimators of short range on the celestial sphere are used in place of the ...
A. Blanchard, Carla Sofia Carvalho, F. Bernardeau, F. Bernardeau, Kavilan Moodley, Martin Bucher, Mathieu Remazeilles, S Cole   +7 more
core   +3 more sources

A Unified Photometric Redshift Calibration for Weak Lensing Surveys Using the Dark Energy Spectroscopic Instrument

The Astrophysical Journal
The effective redshift distribution n ( z ) of galaxies is a critical component in the study of weak gravitational lensing. Here, we introduce a new method for determining n ( z ) for weak lensing surveys based on high-quality redshifts and neural ...
J. U. Lange, D. Blanco, A. Leauthaud, A. H. Wright, A. Fisher, J. Ratajczak, J. Aguilar, S. Ahlen, S. Bailey, D. Bianchi, C. Blake, D. Brooks, T. Claybaugh, A. Cuceu, K. S. Dawson, A. de la Macorra, J. DeRose, Arjun Dey, P. Doel, N. Emas, S. Ferraro, A. Font-Ribera, J. E. Forero-Romero, C. Garcia-Quintero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, S. Heydenreich, H. Hildebrandt, M. Ishak, J. Jimenez, S. Joudaki, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, O. Lahav, C. Lamman, M. Landriau, L. Le Guillou, M. E. Levi, L. Medina-Varela, A. Meisner, R. Miquel, J. Moustakas, S. Nadathur, J. A. Newman, N. Palanque-Delabrouille, A. Porredon, F. Prada, I. Pérez-Ràfols, G. Rossi, R. Ruggeri, E. Sanchez, C. Saulder, D. Schlegel, M. Schubnell, D. Sprayberry, Z. Sun, G. Tarlé, B. A. Weaver, S. Yuan, P. Zarrouk, H. Zou   +63 more
doaj   +1 more source

Constraints on Field Galaxy Halos from Weak Lensing and Satellite Dynamics

, 2004
Here I summarize constraints on the nature of the dark matter halos of field galaxies that have been obtained from the most recent investigations of (i) weak galaxy-galaxy lensing and (ii) the dynamics of satellite galaxies in orbit about large host ...
Brainerd, Tereasa G.
core   +2 more sources

Gravity-selected Cluster Samples: A New Take on the Compton-y–Mass Relation

The Astrophysical Journal
We investigate the scaling relation between the Compton- y parameter and mass in a gravity-selected sample of galaxy clusters, selected based on their gravitational lensing effects on background galaxies. Unlike intracluster medium (ICM)−selected samples,
S. Andreon, M. Radovich
doaj   +1 more source

Cluster Mass Reconstruction by a Weak Shear Field

, 1999
The tidal gravitational field of galaxy clusters causes a coherent distortion of the images of background sources. Since the distribution of image distortions, namely the shear field, traces the local gravitational potential of a deflector, it can be ...
Futamase, Toshifumi, Tada, Masashi, Umetsu, Keiichi   +2 more
core   +3 more sources

DESI-DR1 $3 \times 2$-pt analysis: consistent cosmology across weak lensing surveys

The Open Journal of Astrophysics
We present a joint cosmological analysis of projected galaxy clustering observations from the Dark Energy Spectroscopic Instrument Data Release 1 (DESI-DR1), and overlapping weak gravitational lensing observations from three datasets: the Kilo-Degree ...
A, Porredon, C. Blake, J. U. Lange, N. Emas, J. Aguilar, S. Ahlen, A. Bera, D. Bianchi, D. Brooks, F. J. Castander, T. Claybaugh, J. Coloma Nadal, A. Cuceu, K. S. Dawson, A. de la Macorra, Biprateep Dey, P. Doel, A. Elliott, S. Ferraro, A. Font-Ribera, J. E. Forero-Romero, C. Garcia-Quintero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, J. Guy, B. Hadzhiyska, H. K. Herrera-Alcantar, S. Heydenreich, K. Honscheid, C. Howlett, D. Huterer, M. Ishak, S. Joudaki, R. Joyce, D. Kirkby, A. Kremin, A. Krolewski, O. Lahav, C. Lamman, M. Landriau, L. Le Guillou, A. Leauthaud, M. E. Levi, M. Manera, A. Meisner, R. Miquel, S. Nadathur, J. A. Newman, G. Niz, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, F. Prada, I. Pérez-Ràfols, A. Robertson, G. Rossi, R. Ruggeri, E. Sanchez, C. Saulder, D. Schlegel, M. Schubnell, A. Semenaite, H. Seo, J. Silber, A. Souki, D. Sprayberry, G. Tarlé, M. Vargas-Magaña, B. A. Weaver, C. Zhou, R. Zhou, H. Zou, DESI Colllaboration   +73 more
doaj   +1 more source

Ray-tracing through the Millennium Simulation: Born corrections and lens-lens coupling in cosmic shear and galaxy-galaxy lensing

, 2009
(abridged) We study the accuracy of various approximations to cosmic shear and weak galaxy-galaxy lensing and investigate effects of Born corrections and lens-lens coupling. We use ray-tracing through the Millennium Simulation to calculate various cosmic-
Amendola, Aubert, Bacon, Bartelmann, Bartelmann, Benjamin, Blandford, Bower, Carbone, Cooley, Cooray, Cooray, Couchman, Crittenden, Croton, Das, De Lucia, Eisenstein, Faure, Fosalba, Frigo, Fu, Gavazzi, Hamana, Heymans, Hilbert, Hilbert, Hilbert, Hirata, Hoekstra, J. Hartlap, Jain, Jain, Mandelbaum, Massey, Massey, Massey, Meneghetti, Munshi, Neto, P. Schneider, Pace, Peacock, Peirani, Rozo, S. D. M. White, S. Hilbert, Schimd, Schneider, Schneider, Seitz, Seitz, Seljak, Semboloni, Shapiro, Simon, Smith, Spergel, Springel, Springel, Taylor, Tinker, Vale, Van Waerbeke, Wambsganss, Wambsganss, Wambsganss, White, White, White, Ziour   +70 more
core   +1 more source

The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics

The Open Journal of Astrophysics
The current generation of large galaxy surveys will test the cosmological model by combining multiple types of observational probes. Realising the statistical promise of these new datasets requires rigorous attention to all aspects of analysis including ...
Chris Blake, C. Garcia-Quintero, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, J. DeRose, A. Dey, P. Doel, N. Emas, S. Ferraro, J. E. Forero-Romero, G. Gutierrez, S. Heydenreich, K. Honscheid, C. Howlett, M. Ishak, S. Joudaki, E. Jullo, R. Kehoe, D. Kirkby, A. Kremin, A. Krolewski, M. Landriau, J. U. Lange, A. Leauthaud, M. E. Levi, M. Manera, R. Miquel, J. Moustakas, G. Niz, W. J. Percival, I. Pérez-Ràfols, A. Porredon, G. Rossi, R. Ruggeri, E. Sanchez, C. Saulder, D. Schlegel, D. Sprayberry, Z. Sun, G. Tarlé, B. A. Weaver   +43 more
doaj   +1 more source