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Strong gravitational lensing provides a powerful test of Cold Dark Matter(CDM) as it enables the detection and mass measurement of low mass haloes evenif they do not contain baryons. Compact lensed sources such as Active GalacticNuclei (AGN) are particularly sensitive to perturbing subhalos, but their useas a test of CDM has been limited by the small number of systems which havesignificant radio emission which is extended enough avoid significant lensingby stars in the plane of the lens galaxy, and red enough to be minimallyaffected by differential dust extinction. Narrow-line emission is a promisingalternative as it is also extended and, unlike radio, detectable in virtuallyall optically selected AGN lenses. We present first results from a WFC3 grismnarrow-line survey of lensed quasars, for the quadruply lensed AGN HE0435-1223.Using a forward modelling pipeline which enables us to robustly account forspatial blending, we measure the [OIII] 5007 \AA~ flux ratios of the fourimages. We find that the [OIII] fluxes and positions are well fit by a simplesmooth mass model for the main lens. Our data rule out a $M_{600}>10^{8}(10^{7.2}) M_\odot$ NFW perturber projected within $\sim$1\farcs0 (0\farcs1)arcseconds of each of the lensed images, where $M_{600}$ is the perturber masswithin its central 600 pc. The non-detection is broadly consistent with theexpectations of $\Lambda$CDM for a single system. The sensitivity achieveddemonstrates that powerful limits on the nature of dark matter can be obtainedwith the analysis of $\sim20$ narrow-line lenses.

Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism