Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.8011h&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #80.11; Bulletin of the American Astronomical Society, Vol. 34, p.1237
Mathematics
Logic
Scientific paper
Control of calibration errors in shear estimators will be essential to cosmic shear measurements that aim to constrain cosmological parameters to unprecedented accuracy. Such errors can affect the normalization of the cosmic shear power spectrum and, if they are dependent on angular diameter or other factors that correlate with redshift, can affect attempts to measure the evolution of the power spectrum and the equation of state of the dark energy. We compare methods for removing the circularizing effect of seeing on a galaxy's image. We also draw attention to a previously unrecognized calibration error resulting from a selection bias: since most galaxy detection algorithms preferentially select circular galaxies, galaxies intrinsically aligned orthogonal to the cosmic shear are more likely to be observed, resulting in an underestimate of the shear.
Hirata Christopher M.
Seljak Uros
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