Status: Bibliographieeintrag
Standort: ---
Exemplare:
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| Online-Ressource |
Verfasst von: | Bartelmann, Matthias [VerfasserIn]  |
| Viola, Massimo [VerfasserIn]  |
| Melchior, Peter [VerfasserIn]  |
| Schäfer, Björn Malte [VerfasserIn]  |
Titel: | Calibration biases in measurements of weak lensing |
Verf.angabe: | Matthias Bartelmann, Massimo Viola, Peter Melchior, Björn M. Schäfer |
Fussnoten: | Gesehen am 21.09.2017 |
Titel Quelle: | Enthalten in: De.arxiv.org |
Jahr Quelle: | 2011 |
Band/Heft Quelle: | (2011) Artikel-Nummer 1103.5923, 5Seiten |
Abstract: | As recently shown by Viola et al., the common (KSB) method for measuring weak gravitational shear creates a non-linear relation between the measured and the true shear of objects. We investigate here what effect such a non-linear calibration relation may have on cosmological parameter estimates from weak lensing if a simpler, linear calibration relation is assumed. We show that the non-linear relation introduces a bias in the shear-correlation amplitude and thus a bias in the cosmological parameters Omega_matter and sigma_8. Its direction and magnitude depends on whether the point-spread function is narrow or wide compared to the galaxy images from which the shear is measured. Substantial over- or underestimates of the cosmological parameters are equally possible, depending also on the variant of the KSB method. Our results show that for trustable cosmological-parameter estimates from measurements of weak lensing, one must verify that the method employed is free from ellipticity-dependent biases or monitor that the calibration relation inferred from simulations is applicable to the survey at hand. |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Kostenfrei: Verlag: http://arxiv.org/abs/1103.5923 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1563691310 |
Verknüpfungen: | → Sammelwerk |
Calibration biases in measurements of weak lensing / Bartelmann, Matthias [VerfasserIn] (Online-Ressource)
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