Observation of cluster substructure using higher order weakly lensed moments.

Details Observation of cluster substructure using higher order weakly lensed moments. Observation of cluster substructure using higher order weakly lensed moments.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20312006i&link_type=abstract

American Astronomical Society Meeting 203, #120.06; Bulletin of the American Astronomical Society, Vol. 35, p.1407

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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 small impact parameter galaxy-clump 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 Hubble deep fields. We will present here the results of this analysis for overlapping GOODS fields. The dark cluster and clump masses are estimated. Alternatives to a lensing hypothesis appear improbable. Observation of sextupole moments would provide a means to measure dark matter structure on smaller length scales than heretofore.

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