Drexel University Home Pagewww.drexel.edu DREXEL UNIVERSITY LIBRARIES HOMEPAGE >>
iDEA DREXEL ARCHIVES >>

iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Arts and Sciences > Department of Physics > Faculty Research and Publications (Physics) > The galaxy octopole moment as a probe of weak lensing shear fields

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1919

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)

Files in This Item:

File Description SizeFormat
2006175228.pdf242.34 kBAdobe PDFView/Open
View Statistics

Items in iDEA are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! iDEA Software Copyright © 2002-2010  Duraspace - Feedback