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We report on the detection of three strong HI absorbers originating in theoutskirts (i.e., impact parameter, $\rho_{\rm cl} \approx (1.6-4.7) r_{500}$)of three massive ($M_{500}\sim3\times10^{14} M_{\odot}$) clusters of galaxiesat redshift $z_{\rm cl} \approx 0.46$, in the $Hubble Space Telescope$ CosmicOrigins Spectrograph ($HST$/COS) spectra of 3 background UV-bright quasars.These clusters were discovered by the 2500 deg$^2$ South Pole TelescopeSunyaev$-$Zel'dovich (SZ) effect survey. All three COS spectra show partialLyman limit absorber with $N(HI) > 10^{16.5} \ \rm cm^{-2}$ near thephotometric redshifts ($|\Delta z/(1+z)| \approx 0.03$) of the clusters. Thecompound probability of random occurrence of all three absorbers is $<0.02$%,indicating that the absorbers are most likely related to the targeted clusters.We find that the outskirts of these SZ-selected clusters are remarkably rich incool gas compared to existing observations of other clusters in the literature.The effective Doppler parameters of the Lyman series lines, obtained usingsingle cloud curve-of-growth (COG) analysis, suggest a non-thermal/turbulentvelocity of a few $\times10 \ \rm km s^{-1}$ in the absorbing gas. We emphasizethe need for uniform galaxy surveys around these fields and for more UVobservations of QSO-cluster pairs in general in order to improve the statisticsand gain further insights into the unexplored territory of the largestcollapsed cosmic structures.

Discovery of an HI-rich Gas Reservoir in the Outskirts of SZ-effect Selected Clusters