JWST Lensed quasar dark matter survey II: Strongest gravitational lensing limit on the dark matter free streaming length to date

• DOI: 10.48550/arxiv.2405.01620
• Publication Date: 2024-05-02
• Authors: Ryan E. Keeley; Anna Nierenberg; Daniel Gilman; Charles Gannon; Simon Birrer; Tommaso Treu; Andrew Benson; Xiaolong Du; Kevork N. Abazajian; T. Anguita; Vardha N. Bennert; S. G. Djorgovski; K. K. Gupta; S. Hoenig; Alexander Kusenko; C. Lemon; Matthew A. Malkan; V. Motta; Leonidas A. Moust...; Maverick S. H. Oh; Dominique Sluse; Daniel Stern; Risa H. Wechsler
• Keywords: Cosmology and Nongalactic Astrophysics (astro-ph.CO); FOS: Physical sciences; Astrophysics - Cosmology and Nongalactic Astrophysics

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