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We use the ALFALFA HI survey to examine whether the cold gas reservoirs ofgalaxies are inhibited or enhanced in large-scale filaments. Our sampleincludes 9947 late-type galaxies with HI detections, and 4236 late-typegalaxies with well-determined HI detection limits that we incorporate usingsurvival analysis statistics. We find that, even at fixed local density andstellar mass, and with group galaxies removed, the HI deficiency of galaxies inthe stellar mass range 8.5 <log(M/Mo) < 10.5 decreases with distance from thefilament spine, suggesting that galaxies are cut off from their supply of coldgas in this environment. We also find that, at fixed local density and stellarmass, the galaxies that are the most gas-rich are those in small, correlated"tendril" structures within voids: although galaxies in tendrils are insignificantly denser environments, on average, than galaxies in voids, they arenot redder or more HI deficient. This stands in contrast to the fact thatgalaxies in tendrils are more massive than those in voids, suggesting a moreadvanced stage of evolution. Finally, at fixed stellar mass and color, galaxiescloser to the filament spine, or in high density environments, are moredeficient in HI. This fits a picture where, as galaxies enter denser regions,they first lose HI gas and then redden as star formation is reduced.

The Effect of Filaments and Tendrils on the HI Content of Galaxies