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2005MNRAS.361..160H - Mon. Not. R. Astron. Soc., 361, 160-176 (2005/July-3)
Cosmological weak lensing with the HST GEMS survey.
HEYMANS C., BROWN M.L., BARDEN M., CALDWELL J.A.R., JAHNKE K., PENG C.Y., RIX H.-W., TAYLOR A., BECKWITH S.V.W., BELL E.F., BORCH A., HAUSSLER B., JOGEE S., McINTOSH D.H., MEISENHEIMER K., SANCHEZ S.F., SOMERVILLE R., WISOTZKI L. and WOLF C.
Abstract (from CDS):
Removing image and point spread function (PSF) distortions are crucial to all weak lensing analyses. We therefore include a thorough discussion on the degree of ACS PSF distortion and anisotropy which we characterize directly from GEMS data. Consecutively imaged over 20 d, GEMS data also allow us to investigate PSF instability over time. We find that, even in the relatively short GEMS observing period, the ACS PSF ellipticity varies at the level of a few per cent which we account for with a semi-time-dependent PSF model. Our correction for the temporal and spatial variability of the PSF is shown to be successful through a series of diagnostic tests.
Abstract Copyright: 2005 RAS
Journal keyword(s): gravitational lensing - cosmology: observations - large-scale structure of Universe
Simbad objects: 2
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