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The galaxy octopole moment as a probe of weak lensing shear fields
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http://hdl.handle.net/1860/1919
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| Title: | The galaxy octopole moment as a probe of weak lensing shear fields |
| Authors: | Goldberg, David
Natarajan, Priyamvada |
| Issue Date: | 30-Oct-2007 |
| Publisher: | American Astronomical Society |
| Citation: | The Astrophysical Journal. 564 , pp. 65. |
| Abstract: | In this paper, we introduce the octopole moment of the light distribution in galaxies as a probe
of the weak lensing shear field. While traditional ellipticity estimates of the local shear derived from
the quadrupole moment are limited by the width of the intrinsic ellipticity distribution of background
galaxies, the dispersion in the intrinsic octopole distribution is expected to be much smaller, implying
that the signal from this higher order moment is ultimately limited by measurement noise, and not by
intrinsic scatter. We present the computation of the octopole moment and show that current observations
are at the regime where the octopole estimates will soon be able to contribute to the overall accuracy of
the estimates of local shear fields. Therefore, the prospects for this estimator from future datasets like
the Advanced Camera for Survey and the Next Generation Space Telescope are very promising. |
| URI: | http://arxiv.org/abs/astro-ph/0107187v1
http://hdl.handle.net/1860/1919 |
| Appears in Collections: | Faculty Research and Publications (Physics)
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