Observations of cluster substructure using weakly lensed sextupole moments

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dc.creatorIrwin, John
dc.creatorShmakova, Marina
dc.date2003-07-31
dc.date.accessioned2026-07-07T02:09:08Z
dc.date.available2026-07-07T02:09:08Z
dc.descriptionSince 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.
dc.description18 pages, 25 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/astro-ph/0308007
dc.identifierhttp://arxiv.org/abs/astro-ph/0308007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6317
dc.subjectAstrophysics
dc.titleObservations of cluster substructure using weakly lensed sextupole moments
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