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We report a significant detection of the hot intergalactic medium in thefilamentary bridge connecting the galaxy clusters Abell 399 and Abell 401. Thisresult is enabled by a low-noise, high-resolution map of the thermalSunyaev-Zeldovich signal from the Atacama Cosmology Telescope (ACT) and Plancksatellite. The ACT data provide the $1.65'$ resolution that allows us toclearly separate the profiles of the clusters, whose centres are separated by$37'$, from the gas associated with the filament. A model that fits for onlythe two clusters is ruled out compared to one that includes a bridge componentat $>5\sigma$. Using a gas temperature determined from Suzaku X-ray data, weinfer a total mass of $(3.3\pm0.7)\times10^{14}\,\mathrm{M}_{\odot}$ associatedwith the filament, comprising about $8\%$ of the entire Abell 399-Abell 401system. We fit two phenomenological models to the filamentary structure; thefavoured model has a width transverse to the axis joining the clusters of${\sim}1.9\,\mathrm{Mpc}$. When combined with the Suzaku data, we find a gasdensity of $(0.88\pm0.24)\times10^{-4}\,\mathrm{cm}^{-3}$, considerably lowerthan previously reported. We show that this can be fully explained by ageometry in which the axis joining Abell 399 and Abell 401 has a largecomponent along the line of sight, such that the distance between the clustersis significantly greater than the $3.2\,\mathrm{Mpc}$ projected separation onthe plane of the sky. Finally, we present initial results from higherresolution ($12.7"$ effective) imaging of the bridge with the MUSTANG-2receiver on the Green Bank Telescope.

A high-resolution view of the filament of gas between Abell 399 and Abell 401 from the Atacama Cosmology Telescope and MUSTANG-2