Professor Richard Massey r.j.massey@durham.ac.uk
Professor
COSMOS: Three-dimensional weak lensing and the growth of structure
Massey, Richard; Rhodes, Jason; Leauthaud, Alexie; Capak, Peter; Ellis, Richard; Koekemoer, Anton; Refregier, Alexandre; Scoville, Nick; Taylor, James E.; Albert, Justin; Berge, Joel; Heymans, Catherine; Johnston, David; Kneib, Jean-Paul; Mellier, Yannick; Mobasher, Bahram; Semboloni, Elisabetta; Shopbell, Patrick; Tasca, Lidia; Van Waerbeke, Ludovic
Authors
Jason Rhodes
Alexie Leauthaud
Peter Capak
Richard Ellis
Anton Koekemoer
Alexandre Refregier
Nick Scoville
James E. Taylor
Justin Albert
Joel Berge
Catherine Heymans
David Johnston
Jean-Paul Kneib
Yannick Mellier
Bahram Mobasher
Elisabetta Semboloni
Patrick Shopbell
Lidia Tasca
Ludovic Van Waerbeke
Abstract
We present a three-dimensional cosmic shear analysis of the Hubble Space Telescope COSMOS survey, the largest ever optical imaging program performed in space. We have measured the shapes of galaxies for the telltale distortions caused by weak gravitational lensing and traced the growth of that signal as a function of redshift. Using both 2D and 3D analyses, we measure cosmological parameters Ωm, the density of matter in the universe, and σ8, the normalization of the matter power spectrum. The introduction of redshift information tightens the constraints by a factor of 3 and also reduces the relative sampling (or "cosmic") variance compared to recent surveys that may be larger but are only two-dimensional. From the 3D analysis, we find that σ8(Ωm/0.3)0.44 = 0.866img1.gif at 68% confidence limits, including both statistical and potential systematic sources of error in the total budget. Indeed, the absolute calibration of shear measurement methods is now the dominant source of uncertainty. Assuming instead a baseline cosmology to fix the geometry of the universe, we have measured the growth of structure on both linear and nonlinear physical scales. Our results thus demonstrate a proof of concept for tomographic analysis techniques that have been proposed for future weak-lensing surveys by a dedicated wide-field telescope in space.
Citation
Massey, R., Rhodes, J., Leauthaud, A., Capak, P., Ellis, R., Koekemoer, A., …Van Waerbeke, L. (2007). COSMOS: Three-dimensional weak lensing and the growth of structure. Astrophysical Journal Supplement, 172(1), 239-253. https://doi.org/10.1086/516599
Journal Article Type | Article |
---|---|
Publication Date | Sep 1, 2007 |
Deposit Date | Mar 21, 2013 |
Publicly Available Date | May 6, 2015 |
Journal | Astrophysical Journal Supplement |
Print ISSN | 0067-0049 |
Electronic ISSN | 1538-4365 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 172 |
Issue | 1 |
Pages | 239-253 |
DOI | https://doi.org/10.1086/516599 |
Files
Published Journal Article
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Copyright Statement
© 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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