Galaxy-QSO Angular Correlation and Weak Gravitational Lensing

Details Galaxy-QSO Angular Correlation and Weak Gravitational Lensing Galaxy-QSO Angular Correlation and Weak Gravitational Lensing

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..aprv16004g&link_type=abstract

American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #V16.004

Physics

Scientific paper

There is some observational evidence for an excess angular correlation between the distribution of galaxies and much more distant QSOs. It was suggested that such a correlation can be explained by weak gravitational lensing of the QSO image by intermediate galaxies. However there is a considerable quantitative disagreement between observations and theoretical predictions. We use weak gravitational lensing theory to calculate this angular correlation and present some new results exploring its dependence on the large structure. We show that different power spectra (e.g. linear and non-linearly evolved CDM with adiabatic fluctuations, isocurvature, HDM, cosmic strings) imply clear and distinct signatures in the predicted angular correlation, therefore providing an independent test for the mechanism of structure formation. We compare the results with observational data and discuss future steps.

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