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Gravitational Imaging of CDM Substructure
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Gravitational Imaging of CDM Substructure
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We propose the novel method of ``gravitational imaging'' to detect and quantify luminous and dark-matter substructure in gravitational-lens galaxies. The method utilizes highly-magnified Einstein rings and arcs as sensitive probes of small perturbations in the lens potential (due to the presence of mass substructure), reconstructing the gravitational lens potential non-parametrically. Numerical simulations show that the implemented algorithm can reconstruct the smooth mass distribution of a typical lens galaxy - exhibiting reasonable signal-to-noise Einstein rings - as well as compact substructure with masses as low as M_sub~10^-3 M_lens, if present. ``Gravitational imaging'' of pure dark-matter substructure around massive galaxies can provide a new window on the standard cold-dark-matter paradigm, using very different physics than ground-based direct-detection experiments, and probe the hierarchical structure-formation model which predicts this substructure to exist in great abundance.
Forward citations
Cited by 2 Pith papers
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Fuzzy dark matter soliton core hosting a supermassive black hole as a dense low-mass perturber in strong gravitational lensing
A soliton core of fuzzy dark matter, compressed by an embedded supermassive black hole, reproduces the observed mass profile of the ~10^6 Msun perturber in JVAS B1938+666 for FDM mass ~3.6e-21 eV and subhalo mass ~7e6 Msun.
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Strong-lensing Perturber Signatures in Self-interacting Dark Matter Simulations
Core-collapsed self-interacting dark matter halos in the Concerto simulations reach high enough central densities to match the perturbing masses inferred in J0946, B1938, SDP.81, and SPT2147-50.
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