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We present the first detection of cool, neutral gas in the outskirts of low-zgalaxy clusters using a statistically significant sample of 3191 z$\approx$0.2background quasar - foreground cluster pairs by cross-matching the HubbleSpectroscopic Legacy Archive quasar catalog with optically- and SZ-selectedcluster catalogs. The median cluster mass of our sample is $\approx 10^{14.2}$M_sun, with a median impact parameter ($\rho_{cl}$) of $\approx5$ Mpc. Wedetect significant Lya, marginal CIV, but no OVI absorption in thesignal-to-noise ratio weighted mean stacked spectra with rest-frame equivalentwidths of 0.096$\pm$0.011 A, 0.032$\pm$0.015 A, and <0.009 A (3$\sigma$) forour sample. The Lya REW shows a declining trend with increasing $\rho_{cl}$($\rho_{cl}$ / $R_{500}$) which is well explained by a power-law with a slopeof -0.79 (-0.70). The covering fractions (CFs) measured for Lya (21\%), CIV(10\%) and OVI (10\%) in cluster outskirts are significantly lower than in thecircumgalatic medium (CGM). We also find that the CGM of galaxies that arecloser to cluster centers or that are in massive clusters is considerablydeficient in neutral gas. The low CF of the Lya along with the non-detection ofLya signal when the strong absorbers (N(HI) > $10^{13} cm^{-2}$) are excluded,indicate the patchy distribution of cool gas in the outskirts. We argue thatthe cool gas in cluster outskirts in combination arises from the circumgalacticgas stripped from cluster galaxies and to large-scale filaments feeding theclusters with cool gas.

Characterizing cool, neutral gas and ionized metals in the outskirts of low-z galaxy clusters