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2013MNRAS.432.2385S - Mon. Not. R. Astron. Soc., 432, 2385-2401 (2013/July-1)
On the shear estimation bias induced by the spatial variation of colour across galaxy profiles.
SEMBOLONI E., HOEKSTRA H., HUANG Z., CARDONE V.F., CROPPER M., JOACHIMI B., KITCHING T., KUIJKEN K., LOMBARDI M., MAOLI R., MELLIER Y., MILLER L., RHODES J., SCARAMELLA R., SCHRABBACK T. and VELANDER M.
Abstract (from CDS):
Based on our study of synthetic galaxies, we find that the bias is a few times 10-3 for a typical galaxy observed by Euclid. Consequently, it cannot be neglected and needs to be accounted for. We demonstrate how one can do so using spatially resolved observations of galaxies in two filters. We show that Hubble Space Telescope (HST) observations in the F606W and F814W filters allow us to model and reduce the bias by an order of magnitude, sufficient to meet Euclid's scientific requirements. The precision of the correction is ultimately determined by the number of galaxies for which spatially resolved observations in at least two filters are available. We use results from the Millennium simulation to demonstrate that archival HST data will be sufficient for the tomographic cosmic shear analysis with the Euclid data set.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): gravitational lensing: weak - surveys
Simbad objects: 3
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