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How accurately can we measure weak gravitational shear?
Open accessAbstract
With the recent detection of cosmic shear, the most challenging effect of weak gravitational lensing has been observed. The main difficulties for this detection were the need for a large amount of high quality data and the control of systematics during the gravitational shear measurement process, in particular those coming from the Point Spread Function anisotropy. In this paper we perform detailed simulations with the state-of-the-art algorithm developed by Kaiser, Squires and Broadhurst (KSB) to measure gravitational shear. We show that for realistic PSF profiles the KSB algorithm can recover any shear amplitude in the range with a relative, systematic error of . We give quantitative limits on the PSF correction method as a function of shear strength, object size, signal-to-noise and PSF anisotropy amplitude, and we provide an automatic procedure to get a reliable object catalog for shear measurements out of the raw images.
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Citations
Cited by
CFHTLenS: the Canada–France–Hawaii Telescope Lensing Survey
Heymans, C., Van Waerbeke, L., Miller, L., Erben, T., Hildebrandt, H., Hoekstra, H., Kitching, T. D., Mellier, Y., Simon, P., Bonnett, C., et al. (2012) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2012.21952.x · Cited by 718
Self-citationIntrinsic alignment-lensing interference as a contaminant of cosmic shear
Hirata, C. M., & Seljak, U. (2004) · Physical Review D · doi:10.1103/physrevd.70.063526 · Cited by 586
The Shear Testing Programme – I. Weak lensing analysis of simulated ground-based observations
Heymans, C., Van Waerbeke, L., Bacon, D., Berge, J., Bernstein, G., Bertin, E., Bridle, S., Brown, M. L., Clowe, D., Dahle, H., et al. (2006) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2006.10198.x · Cited by 508
Self-citationWeak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements
Leauthaud, A., Massey, R., Kneib, J., Rhodes, J., Johnston, D. E., Capak, P., Heymans, C., Ellis, R. S., Koekemoer, A. M., Le Fevre, O., et al. (2007) · The Astrophysical Journal Supplement Series · doi:10.1086/516598 · Cited by 434
Self-citationThe Shear Testing Programme 2: Factors affecting high-precision weak-lensing analyses
Massey, R., Heymans, C., Bergé, J., Bernstein, G., Bridle, S., Clowe, D., Dahle, H., Ellis, R., Erben, T., Hetterscheidt, M., et al. (2007) · Monthly Notices of the Royal Astronomical Society · doi:10.1111/j.1365-2966.2006.11315.x · Cited by 403
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Metadata
- Authors
- Erben, T., Van Waerbeke, L., Bertin, E., Mellier, Y., & Schneider, P.
- Venue
- Astronomy & Astrophysics
- Publisher
- EDP Sciences
- Published
- 2001-02
- Volume
- 366
- Issue
- 3
- Pages
- 717-735
- ISSN
- 0004-6361 (ISSN-L)
- 1432-0746
- OpenAlex
- W2044710075
- Cited by
- 177
- References
- 0
- FWCI
- 7.53
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Erben, T., Van Waerbeke, L., Bertin, E., Mellier, Y., & Schneider, P. (2001). How accurately can we measure weak gravitational shear? Astronomy & Astrophysics. https://doi.org/10.1051/0004-6361%3A20010013
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