New Constraints on Dark Matter Substructure from Weak Gravitational Flexion

Details New Constraints on Dark Matter Substructure from Weak Gravitational Flexion New Constraints on Dark Matter Substructure from Weak Gravitational Flexion

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..379..338r&link_type=abstract

Cosmic Frontiers ASP Conference Series, Vol. 379, proceedings of the conference held 31 July-4 August 2006 at Durham University,

Physics

2

Scientific paper

We place a first weak lensing constraint on the degree of substructure present in the Universe using a determination of the width of the measured flexion distribution for galaxies in the HST-GEMS survey. This then places a robust upper limit on the gravitational flexion variance at the angular scales of the GEMS galaxy images themselves. The sensitivity of flexion to small-scale power allows this measurement to restrict the substructure mass fraction in this field to a value f_m <0.4, for a mass variance σ_8=0.9. We briefly discuss the potential for this method to further improve upon this constraint.

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