The Shear Testing Programme – I. Weak lensing analysis of simulated ground-based observations
نویسندگان
چکیده
منابع مشابه
Spurious Shear from the Atmosphere in Ground-Based Weak Lensing Observations
Weak lensing observations have the potential to be even more powerful than cosmic microwave background (CMB) observations in constraining cosmological parameters. However, the practical limits to weak lensing observations are not known. Most theoretical studies of weak lensing constraints on cosmology assume that the only limits are shot noise on small scales, and cosmic variance on large scale...
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We present a new shear estimator for weak lensing observations which properly accounts for the effects of a realistic point spread function (PSF). Images of faint galaxies are subject to gravitational shearing followed by smearing with the instrumental and/or atmospheric PSF. We construct a ‘finite resolution shear operator’ which when applied to an observed image has the same effect as a gravi...
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We present the detection of weak gravitational lensing in the eld of the radio galaxy 3C324 (z = 1:206) using deep HST imaging. From an analysis of the shapes of faint R = 24:5{27.5 galaxies in the eld we measure a weak, coherent distortion centered close to the radio source. This shear eld most likely arises from gravitational lensing of distant eld galaxies by a foreground mass concentration....
متن کاملShear calibration biases in weak lensing surveys
We investigate biases induced by the conversion between the observed image shape to shear distortion in current weak lensing analysis methods. Such overall calibration biases cannot be detected by the standard tests such as E/B decomposition or calibration with stars. We find that the non-Gaussianity of point spread function has a significant effect and can lead to up to 15 per cent error on th...
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We present a comprehensive analysis of strong-lensing, weak-lensing shear and magnification data for a sample of 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 < ∼ z < ∼ 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our analysis combines constraints from 16-band Hubble Space Telescope observations and wide-field multi-color imaging taken pri...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2006
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2006.10198.x