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Measurement of Cosmic Shear with the Space Telescope Imaging Spectrograph

Rhodes, Jason and Refregier, Alexandre and Collins, Nicholas R. and Gardner, Jonathan P. and Groth, Edward J. and Hill, Robert S. (2004) Measurement of Cosmic Shear with the Space Telescope Imaging Spectrograph. Astrophysical Journal, 605 (1). pp. 29-36. ISSN 0004-637X. doi:10.1086/382181.

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Weak lensing by large-scale structure allows a direct measure of the dark matter distribution. We have used parallel images taken with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope to measure weak lensing, or cosmic shear. We measure the shapes of 26,036 galaxies in 1292 STIS fields and measure the shear variance at a scale of 0farcm51. The charge transfer efficiency (CTE) of STIS has degraded over time and introduces a spurious ellipticity into galaxy shapes during the readout process. We correct for this effect as a function of signal-to-noise ratio and CCD position. We further show that the detected cosmic shear signal is nearly constant in time over the approximately 4 yr of observation. We detect cosmic shear at the 5.1 σ level, and our measurement of the shear variance is consistent with theoretical predictions in a ΛCDM universe. This provides a measure of the normalization of the mass power spectrum σ_8 = (1.02 ± 0.16)(0.3/Ω_m)^(0.46)(0.21/Γ)^(0.18). The 1 σ error includes noise, cosmic variance, systematics, and the redshift uncertainty of the source galaxies. This is consistent with previous cosmic shear measurements, but tends to favor those with a high value of σ_8. It is also consistent with the recent determination of σ_8 from the Wilkinson Microwave Anisotropy Probe (WMAP) experiment.

Item Type:Article
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URLURL TypeDescription Paper
Rhodes, Jason0000-0002-4485-8549
Additional Information:© 2004. The American Astronomical Society. Received 2003 August 1; accepted 2003 December 19. We thank Richard Massey and Richard Ellis for useful discussions. We thank the referee, Peter Schneider, for useful comments and suggestions. A. R. was supported in Cambridge by an EEC fellowship from the TMR network on Gravitational Lensing and by a Wolfson College Research Fellowship. E. J. G. was supported by NASA grant NAG5-6279. J. R. was supported by an National Research Council-GSFC Research Associateship. We thank Bruce Woodgate, Elliot Malumuth, Randy Kimble, Ted Gull, Terry Beck, Keith Feggans, and the rest of the STIS team at GSFC for their support in cataloging and understanding the STIS parallel images.
Funding AgencyGrant Number
National Research CouncilUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:cosmology: observations; dark matter; gravitational lensing
Issue or Number:1
Record Number:CaltechAUTHORS:20170408-163016408
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Official Citation:Jason Rhodes et al 2004 ApJ 605 29
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76197
Deposited By: 1Science Import
Deposited On:07 Mar 2018 18:29
Last Modified:15 Nov 2021 16:58

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