JWST Lensed quasar dark matter survey II: Strongest gravitational lensing limit on the dark matter free streaming length to date
arxiv(2024)
摘要
This is the second in a series of papers in which we use JWST MIRI multiband
imaging to measure the warm dust emission in a sample of 31 multiply imaged
quasars, to be used as a probe of the particle nature of dark matter. We
present measurements of the relative magnifications of the strongly lensed warm
dust emission in a sample of 9 systems. The warm dust region is compact and
sensitive to perturbations by populations of halos down to masses ∼ 10^6
M_⊙. Using these warm dust flux-ratio measurements in combination with
5 previous narrow-line flux-ratio measurements, we constrain the halo mass
function. In our model, we allow for complex deflector macromodels with
flexible third and fourth-order multipole deviations from ellipticity, and we
introduce an improved model of the tidal evolution of subhalos. We constrain a
WDM model and find an upper limit on the half-mode mass of 10^7.6 M_⊙
at posterior odds of 10:1. This corresponds to a lower limit on a thermally
produced dark matter particle mass of 6.1 keV. This is the strongest
gravitational lensing constraint to date, and comparable to those from
independent probes such as the Lyα forest and Milky Way satellite
galaxies.
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