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- W2071799558 abstract "We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems. The variance of the effect depends on the subhalo mass function, scaling as the product of the substructure mass fraction, and a characteristic mass of subhalos (namely 〈m2〉/〈m〉). Time delay perturbations therefore complement gravitational lens flux ratio anomalies and astrometric perturbations by measuring a different moment of the subhalo mass function. Unlike flux ratio anomalies, time delay millilensing is unaffected by dust extinction or stellar microlensing in the lens galaxy. Furthermore, we show that time delay ratios are immune to the radial profile degeneracy that usually plagues lens modeling. We lay out a mathematical theory of time delay perturbations and find it to be tractable and attractive. We predict that in cusp lenses with close triplets of images, substructure may change the arrival-time order of the images (compared with smooth models). We discuss the possibility that this effect has already been observed in RX J1131−1231." @default.
- W2071799558 created "2016-06-24" @default.
- W2071799558 creator A5015312473 @default.
- W2071799558 creator A5039380469 @default.
- W2071799558 date "2009-06-25" @default.
- W2071799558 modified "2023-10-01" @default.
- W2071799558 title "A NEW CHANNEL FOR DETECTING DARK MATTER SUBSTRUCTURE IN GALAXIES: GRAVITATIONAL LENS TIME DELAYS" @default.
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- W2071799558 doi "https://doi.org/10.1088/0004-637x/699/2/1720" @default.
- W2071799558 hasPublicationYear "2009" @default.
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