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- W3100408069 endingPage "24" @default.
- W3100408069 startingPage "24" @default.
- W3100408069 abstract "Luminous stars in background galaxies straddling the lensing caustic of a foreground galaxy cluster can be individually detected due to extreme magnification factors of ∼102–103, as recently observed in deep HST images. We propose a direct method to probe the presence of dark matter subhalos in galaxy clusters by measuring the astrometric perturbation they induce on the image positions of magnified stars or bright clumps: lensing by subhalos breaks the symmetry of a smooth critical curve, traced by the midpoints of close image pairs. For the giant arc at z = 0.725 behind the lensing cluster Abell 370 at z = 0.375, a promising target for detecting image pairs of stars, we find that subhalos of masses in the range of 106–108 M⊙ with the abundance predicted in the cold dark matter theory should typically imprint astrometric distortions at the level of 20–80 mas. We estimate that ∼10 hr integrations with JWST at ∼1–3 μm may uncover several magnified stars whose image doublets will reveal the subhalo-induced structures of the critical curve. This method can probe a dynamic range in the subhalo-to-cluster halo mass ratio of m/M ∼ 10−7–10−9, thereby placing new constraints on the nature of dark matter." @default.
- W3100408069 created "2020-11-23" @default.
- W3100408069 creator A5037288669 @default.
- W3100408069 creator A5051494527 @default.
- W3100408069 creator A5056230581 @default.
- W3100408069 creator A5083959817 @default.
- W3100408069 date "2018-10-26" @default.
- W3100408069 modified "2023-10-17" @default.
- W3100408069 title "Probing Dark Matter Subhalos in Galaxy Clusters Using Highly Magnified Stars" @default.
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