Book chapter
Finding the arciness in arclets - exploring the octopole moments of lensed galaxies
The Shapes of Galaxies and Their Dark Halos, pp 101-104
01 Mar 2002
Abstract
We introduce the octopole moment measurement of the light distribution in galaxies as a probe of the weak lensing shear field. While traditional ellipticity estimates of local shear have traditionally been limited by the width of the background intrinsic ellipticity distribution, the dispersion in the intrinsic octopole distribution is expected to be quite small, meaning that the signal is ultimately limited by measurement noise, not by intrinsic scatter. In a series of estimates, we show that current observations are at the regime where the octopole estimates will be able to contribute to the overall accuracy of the estimates of local shear fields.
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Details
- Title
- Finding the arciness in arclets - exploring the octopole moments of lensed galaxies
- Creators
- David M Goldberg - Drexel University, Physics
- Publication Details
- The Shapes of Galaxies and Their Dark Halos, pp 101-104
- Conference
- Proceedings of the Yale Cosmology Workshop (New Haven, Connecticut, United States, 28 May 2001–30 May 2001)
- Publisher
- World Scientific Publishing
- Number of pages
- 3
- Resource Type
- Book chapter
- Language
- English
- Academic Unit
- Physics
- Other Identifier
- 9789810248482; 9789812778017; 9789814489393; 991021906511404721