Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20110105b&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #101.05; Bulletin of the American Astronomical Society, Vol. 34, p.1269
Astronomy and Astrophysics
Astronomy
Scientific paper
We measure seeing-corrected ellipticities for 2*E6 galaxies with magnitude R<=23 in 12 widely separated fields totalling 75 deg2 of sky. At angular scales ≳30 ' , ellipticity correlations are detected at high significance and exhibit nearly the pure ``E-mode'' behavior expected of weak gravitational lensing. Even when smoothed to the full field size of 2\fdg5, which is ≈25h-1 Mpc at the lens distances, an rms shear variance of < γ 2 >1/2=0.0012+/-0.0003 is detected. The >30' data constrain the power spectrum of matter fluctuations on comoving scales of ≈10h-1 Mpc to have σ 8 (Ω m/0.3)0.57 = 0.71+0.12-0.16 (95% CL, Λ CDM, Γ =0.21), where the systematic error includes statistical and calibration uncertainties, cosmic variance, and a conservative estimate of systematic contamination based upon the detected B-mode signal. This normalization of the power spectrum is lower than previous weak-lensing results but consistent with all but one of them, is at the lower end of the σ 8 range from various analyses of galaxy cluster abundances, and agrees with recent determinations from CMB and galaxy clustering.
Bernstein Gary M.
Jain Bhuvnesh
Jarvis Michael R.
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