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Observations of Cluster Substructure using Weakly Lensed Sextupole Moments [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2003.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
vp : digital, PDF file
Additional Creators:
Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Since dark matter clusters and groups may have substructure, we have examined the sextupole content of Hubble images looking for a curvature signature in background galaxies that would arise from galaxy-galaxy lensing. We describe techniques for extracting and analyzing sextupole and higher weakly lensed moments. Indications of substructure, via spatial clumping of curved background galaxies, were observed in the image of CL0024 and then surprisingly in both Hubble deep fields. We estimate the dark cluster masses in the deep field. Alternatives to a lensing hypothesis appear improbable, but better statistics will be required to exclude them conclusively. Observation of sextupole moments would then provide a means to measure dark matter structure on smaller length scales than heretofore.
Report Numbers:
E 1.99:slac-pub-10076
slac-pub-10076
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
08/01/2003.
"slac-pub-10076"
Irwin, John.
Type of Report and Period Covered Note:
Topical;
Funding Information:
AC03-76SF00515
View MARC record | catkey: 13823189