Observational Evidence for Weak Gravitational Lensing by Large Scale Structure

Details Observational Evidence for Weak Gravitational Lensing by Large Scale Structure Observational Evidence for Weak Gravitational Lensing by Large Scale Structure

1995-07-04

arxiv.org/abs/astro-ph/9507007v1

Astronomy and Astrophysics

Astrophysics

5 pages, uuencoded compressed Postscript

Scientific paper

A single very deep $10'$ field has been imaged to $r \sim 26$. There are 2682 galaxies with $23 \le r \le 26$ with a size significantly larger than the seeing disk in the field. After correcting for telescope aberrations, possible guiding errors, and signal degradation due to seeing, I find a polarization signal of amplitude $|p|=2.7\%$, with an uncertainty of 1.2\% (95\% confidence limit). For the 1773 galaxies with $23 \le r \le 25$, the measured amplitude is 2.4\% $\pm$ 1.2\% (95\% confidence limit). If this observed polarization is due to gravitational lensing by large scale structure, cosmological inferences can be made. The polarization amplitude would indicate that $\Omega_0 \times \sigma_8 \approx 1$. The amplitude probability distribution is a Rayleigh distribution with variance $\sigma_p^2$ so the probability $P(1/2 < |p|/\sigma_p <2) = 75\%$, and $P(1/3 < |p|/\sigma_p < 3) = 93.5\%$. The measurement of the polarization amplitude in a single field can be used to constrain cosmological models since $\sigma_p \propto \Omega_0 \times \sigma_8$.

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